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活动星系核及其延展区的高能辐射研究
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摘要
活动星系核(AGN)是存在着猛烈活动现象星系的核心。随着探测设备角分辨率和灵敏度的提高,活动星系核及其延展结构在射电、红外、光学、X射线等波段被探测到,分辨出其更细致的结构,如喷流、喷流的节点、射电瓣和热斑等。空间和地面高能望远镜也在MeV-GeV-TeV能段探测到许多源的高能辐射,对AGN的辐射机制给出了强的限制。活动星系核及其延展区的高能辐射成为当今极其活跃的研究领域。本文简述了AGN及其延展结构的观测和理论研究进展,并详实地报告了攻读博士学位期间的研究工作。
     至今,被证认是TeV源的AGNs中除了两个射电星系(Cen A和M87)之外都是blazars,而且绝大多是高峰频的BL Lac天体(HBL)。W Comae是最近被证认的第一个具有TeV辐射的中峰频BL Lac天体(IBL)。我们用均匀单辐射区的同步+同步自康普顿辐射(Syn+SSC)模型研究了该天体从射电到TeV能段的SED,发现该模型能够很好地解释其多波段的观测能谱,且高能伽玛射线辐射是由SSC贡献的,并揭示X射线/光学能段和TeV能段高态不一定同步。
     射电热斑是喷流的终点,通常认为由喷流与周围介质碰撞形成,很可能是高能粒子的加速场所。这些高能的相对论电子通过SSC过程就可能产生高能的伽玛射线辐射,甚至TeV伽玛射线辐射。我们选取Pictor A的西边热斑作为研究对象,分析该热斑从射电到X射线能段的SED,研究其X射线辐射机制。我们发现这个源的SED很难用单一辐射区域的Syn+SSC模型拟合,进而提出这个热斑本身可能还有更进一步的空间结构,并用多辐射区模型很好地拟合了观测的SED。这结果跟Tingay等人(2008)的VLBI的观测是一致的。在非能均分磁场条件下,模型预言了较强的GeV-TeV辐射,并且通过比较热斑和核区的SED发现这个源的GeV-TeV高能辐射主要来自该热斑的贡献而不是核区。
     在此基础上,我们进一步系统地研究了喷流节点和热斑的高能辐射性质,并比较两类延展结构物理性质的本质差异性。我们选择了一个包括21个热斑和46个节点的样本,系统地分析了它们的观测特征。这些节点和热斑的能谱分布覆盖了射电、光学和X射线,可以较好地限制辐射机制模型。我们用单区模型拟合这些SEDs,发现热斑和节点的X射线辐射机制可能是多样化的。一少部分热斑和节点的X射线辐射是由同步辐射产生的,但是对大部分源来说需要一个逆康普顿成分解释观测到的X射线辐射。不考虑聚束(beaming)效应时,用SSC模型拟合观测的X射线流量,热斑的拟合磁场强度B_(SSC)~δ=1对能均分磁场值B_(eq)~δ=1的偏离不超过一个量级,而节点的B_(SSC)~δ=1远远偏离了能均分磁场。我们定义了一个描述偏离能均分磁场程度的量R_B=B_(eq)~(δ=1)/B_(SSC)~(δ=1),发现R_B和光度比RL≡L_(1keV)/L_(5GHz)是强反相关的,尤其是对于节点。考虑聚束效应时,在能均分条件下,相对论电子逆康普顿散射微波背景光子(IC/CMB)模型可以很好地解释热斑和节点的X射线辐射。这种情况下,热斑和节点的能均分磁场值在相同的量级,δ和光度比RL是反相关的。这些结果表明热斑和节点X射线观测的不同是由于聚束效应造成的。SSC模型和IC/CMB模型都预言了一些源有GeV-TeV的高能辐射,而且预言流量在Fermi/LAT和HESS观测灵敏度之上。
Active galactic nuclei (AGNs) are the centers of galaxies with violent activities.With great improvements in both the space resolution and detectionsensitivity, AGN jets and their sub-structures, including knots, hot spots, andlobes were observed in the radio, infrared, optical, and X-ray bands for manyAGNs. Emission in the MeV-GeV-TeV band has also been detected for someAGNs with space and ground-based telescopes, placing strong constraints on theradiation mechanisms of the AGNs. Research on the high energy emission ofAGNs and their extended regions is one of the most active fields in astrophysics.This thesis first presents a detail review on the observational and theoreticalprogress for AGNs and their sub-structures, and then reports my relevant worksin this field.
     So far, almost all identified TeV AGNs are blazars, the only exceptionsbeing two radio galaxies (Cen A and M87), and most of them are HBLs. WComae was the first IBL, which was confirmed to be a TeV source. The SEDsquasi-simultaneously obtained during the TeV flare and during the optical/X-rayoutburst are well fitted by a single-zone synchrotron + synchrotron-self-Compton(Syn+SSC) model. We find that the 7-ray emission can be describedSSC leptonic jet model and the TeV flare and the X-ray/optical outburst maybe not simultaneous.
     It is believed that hot spots are the terminals of jets. They may be due to theinteraction of a jet with surrounding medium, and are the sites for reaccelerationof relativistic electrons. These electrons may be able to produce high energyγ-ray photons through inverse Compton (IC) scattering. We study the radiationmechanism of the X-rays from the western hot spot of Pictor A, a nearby FR IIradio galaxy, and investigate the possible GeV-TeV emission from this hot spot.We find that the single-zone Syn+SSC model can not describe the ultravioletdata well and the multi-zone model presents a much better fit, consistent withthe VLBI observation by Tingay et al. (2008). Both the single-zone and multi- zone models predict Pictor A as a GeV-TeV source if deviating the equipartitioncondition, which could be marginally detectable with Fermi/LAT and HESS. Bycomparing the GeV-TeV flux from the nucleus and from the hot spot predictedby the model, we show that the GeV-TeV flux is dominated by the hot spot.
     Based on our results of the hot spot in Pictor A, we make a systematicalanalysis for a sample of 21 hot spots and 46 knots in order to investigate theradiation mechanisms of the X-rays and the physical differences between thetwo kinds of extended structures. Their radiation mechanisms can be well constrainedwith the observed SEDs that cover the radio, optical, and X-ray bands.The single-zone model fits to the observed SEDs show that the mechanisms forthe X-ray emission from the hot spots and the knots could be diverse. The X-rayemission for a small fraction of the hot spots and knots can be explained withthe synchrotron radiation, but an IC scattering component is required to modelthe X-rays for most the hot spots and knots. Without considering the beamingeffect, the X-rays of some hot spots can roughly be explained by the SSC modelwith a magnetic field strength no more than an order of magnitude smaller thanthe equipartition magnetic field, but the derived B_(SSC)~δ=1 significantly deviates fromB_(eq)~δ=1 for knots. Measuring this deviation with a ratio R_B=B_(eq)~(δ=1)/B_(SSC)~(δ=1), we findthat R_B is strongly correlated with R_L for both the knots and hot spots, especiallyfor the knots, where R_L = L_(1keV)/L_(5GHz). Considering the beaming effect,an IC/CMB model well explains the X-ray emission under the equipartition condition,and the derived B+_(eq) in this scenario are in the same order for both theknots and hot spots. Theδand R_L are correlated. Our results indicate thatthe differences on the X-ray observations for the knots and hot spots may bedue to the beaming effect if the magnetic filed for the knots and hot spots agreewith the equipartition condition. Both the SSC and IC/CMB dominated modelspredict a prominent GeV-TeV component in the SEDs for some sources, whichare detectable by HESS and Fermi/LAT.
引文
[1] Antonucci, R., Unified models for active galactic nuclei and quasars, Annual Review of Astronomy and Astrophysics, 1993, 31:473-521
    [2] Urry, C. M. & Padovani, P., Unified Schemes for Radio-Loud Active Galactic Nuclei. Publications of the Astronomical Society of the Pacific, 1995, 107:803
    [3] Padovani, P., Gamma-Ray Emitting AGN and Unified Schemes, Very High Energy Phenomena in the Universe, 1997, 7
    [4] Bregman, J. N., Continuum radiation from active galactic nuclei, Astronomy and Astrophysics Review, 1990, 2:125-166
    [5] Bregman, J. N., The origin of continuum emission in active galactic nuclei, In Multi-Wavelength Continuum Emission of AGN, 1994, 159:5-16
    [6] Fanaroff, B. L. & Riley, J. M., The morphology of extragalactic radio sources of high and low luminosity, Monthly Notices of the Royal Astronomical Society, 1974. 167:31P-36P
    [7] Osterbrock. D. E., Observational Model of the Ionized Gas in Seyfert and Radio-Galaxy Nuclei, Proceedings of the National Academy of Science, 1978, 75:540-544
    [8] Blandford, R. D. & Rees, M. J., Some comments on radiation mechanisms in Lacertids, In BL Lac Objects, 1978, P328-341
    [9] Lynden-Bell, D., Galactic Nuclei as Collapsed Old Quasars, Nature, 1969, 223:690
    [10] Rees, M. J., George DARWIN Lecture 1976 - Quasars and young galaxies, Quarterly Journal of the Royal Astronomical Society, 1977, 18:429-442
    [11] Rees, M. J., Black Hole Models for Active Galactic Nuclei, Annual Review of Astronomy and Astrophysics, 1984, 22:471-506
    [12] Blandford, R. D. & Konigl, A., Relativistic jets as compact radio sources, Astrophysical Journal, 1979, 232:34-48
    [13] Marscher, A. P., Spontaneous formation of knots in relativistic flows - A model for variability in compact synchrotron sources, Astrophysical Journal, 1980, 239:296-304
    [14] Begelman, M. C., Blandford, R. D., Rees. M. J., Theory of extragalactic radio sources, Reviews of Modern Physics, 1984, 56:255-351
    [15] Urry, C. M. & Shafer, R. A., Luminosity enhancement in relativistic jets and altered luminosity functions for beamed objects, Astrophysical Journal, 1984, 280:569-573
    [16] Ghisellini, G., Maraschi, L., Treves, A., Inhomogeneous synchrotron-self-Compton models and the problem of relativistic beaming of BL Lac objects, Astronomy and Astrophysics, 1985, 146:204-212
    [17] Marscher, A. P., Compact jets and the AGN paradigm, In American Institute of Physics Conference Series, 1992, 254, 377-385
    [18] Ghisellini, G., Padovani. P., Celotti, A., Maraschi, L., Relativistic bulk motion in active galactic nuclei, Astrophysical Journal, 1993, 407:65-82
    [19] Ulrich, M. H., Maraschi, L., Urry, C. M., Variability of Active Galactic Nuclei, Annual Review of Astronomy and Astrophysics, 1997, 35:445-502
    [20] Zensus, J. A., Parsec-Scale Jets in Extragalactic Radio Sources, Annual Review of Astronomy and Astrophysics, 1997, 35:607-636
    [21] Jorstad, S. G., Marscher, A. P., Mattox. J. R. et al., Multiepoch Very Long Baseline Array Observations of EGRET-detected Quasars and BL Lacertae Objects: Super-luminal Motion of Gamma-Ray Bright Blazars, Astrophysical Journal Supplement Series, 2001, 134:181-240
    [22] Wagner, S. J. & Witzel, A., Intraday Variability In Quasars and BL Lac Objects, Annual Review of Astronomy and Astrophysics, 1995, 33:163-198
    [23] Kellermann, K. I. & Pauliny-Toth, I. I. K., The Spectra of Opaque Radio Sources, Astrophysical Journal, 1969, 155:L71
    [24] Marscher, A. P., Marshall, F. E., Mushotzky, R. F. et al., Search for X-ray emission from bursting radio sources, Astrophysical Journal, 1979, 233:498-503
    [25] Quirrenbach, A., Witzel. A., Qian. S. J. et al., Rapid radio polarization variability in the quasar 0917 + 624, Astronomy and Astrophysics, 1989, 226:L1-L4
    [26] Rybicki, G. B. & Lightman, A. P., Book-Review - Radiative Processes in Astrophysics, Astronomy Quarterly, 1979, 3:199
    [27] Ghisellini, G., Special Relativity at Action in the Universe, In Recent Developments in General Relativity, 2000, P5
    [28] Wang, T. G., Matsuoka, M., Kubo, H. et al., A rapid X-ray flare in the radio-loud narrow-line quasar PKS 0558-504, Astrophysical Journal, 2001, 554, 233
    [29] Harris, D. E. & Krawczynski, H., X-Ray Emission from Extragalactic Jets, Annual Review of Astronomy and Astrophysics, 2006, 44:463-506
    [30] Laing, R. A. & Bridle, A. H., Dynamical models for jet deceleration in the radio galaxy 3C 31, Monthly Notices of the Royal Astronomical Society, 2002. 336, 1161
    [31] Laing, R. A. & Bridle, A. H., Relativistic models and the jet velocity field in the radio galaxy 3C 31, Monthly Notices of the Royal Astronomical Society, 2002, 336, 328
    [32] Biretta, J. A., Sparks, W. B., Macchetto, F., Hubble Space Telescope Observations of Superluminal Motion in the M87 Jet, Astrophysical Journal, 1999, 520:621-626
    [33] Beresnyak, A. R., Istomin, Y. N., Pariev, V. I., Relativistic parsec-scale jets: I. Particle acceleration, Astronomy and Astrophysics, 2003, 403:793-804
    [34] Bicknell, G. V. & Begelman, M. C., Understanding the Kiloparsec-Scale Structure of M87, Astrophysical Journal, 1996, 467:597
    [35] Hardcastle, M. J., Worrall, D. M., Kraft, R. P. et al., Radio and X-Ray Observations of the Jet in Centaurus A, Astrophysical Journal, 2003, 593:169-183
    [36] Worrall, D. M., The X-ray jets of active galaxies, The Astronomy and Astrophysics Review, 2009, 17, 1
    [37] Hardcastle, M. J., Hotspots Jets and Environments, In Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, 2008, 386, 46
    [38] Sambruna, R. M., Gambill, J. K., Maraschi, L. et al., A Survey of Extended Radio Jets with Chandra and the Hubble Space Telescope, Astrophysical Journal, 2004, 608:698-720
    [39] Schwartz, D. A., Marshall, H. L., Miller. B. P. et al., CHANDRA Observations of X-ray jet structure on kpc to Mpc scales, New Astronomy Review, 2003, 47:461-465
    [40] Bai. J. M. & Lee. Myung Gyoon, Radio/X-Ray Offsets of Large-Scale Jets Caused by Synchrotron Time Lags, Astrophysical Journal, 2003, 585:L113-L116
    [41] Marshall, H. L., Harris, D. E., Grimes, J. P. et al., Structure of the X-Ray Emission from the Jet of 3C 273, Astrophysical Journal, 2001, 549:L167-L171
    [42] Bicknell, G. V., The relationship of the Fanaroff-Riley classification of extragalactic radio sources to jet physics, Proceedings of the Astronomical Society of Australia, 1985, 6:130-137
    [43] Meisenheimer, K., Roser, H. J., Hiltner, P. R. et al., The synchrotron spectra of radio hot spots, Astronomy and Astrophysics, 1989, 219:63-86
    [44] Bridle, A. H., Hough, D. H., Lonsdale, C. J. et al., Deep VLA imaging of twelve extended 3CR quasars, Astronomical Journal, 1994, 108:766-820
    [45] Blandford, R. D. & Znajek, R. L., Electromagnetic extraction of energy from Kerr black holes, Monthly Notices of the Royal Astronomical Society, 1977, 179:433-456
    [46] Blandford, R. D. & Payne, D. G., Hydromagnetic flows from accretion discs and the production of radio jets, Monthly Notices of the Royal Astronomical Society, 1982, 199:883-903
    [47] Penrose, R., Gravitational Collapse: the Role of General Relativity, Nuovo Cimento Rivista Serie, 1969, 1:252
    [48] Sauty, C., Tsinganos. K., Trussoni, E., Jet Formation and Collimation, In Relativistic Flows in Astrophysics, 2002, 589, 41
    [49] Komissarov, S. S., Ram-Pressure Confinement of Extragalactic Jets, Monthly Notices of the Royal Astronomical Society, 1994, 266, 629
    [50] Fukue, J., Tojyo, M., Hirai, Y., Radiative Collimation of Electron-Positron Jets, Publications of the Astronomical Society of Japan, 2001, 53:555-563
    [51] Wang, J. M., Staubert, R., Ho, L. C., The Accretion Rates and Spectral Energy Distribution of BL Lac Objects, Astrophysical Journal, 2002, 579, 554
    [52] Wang, J. M., Luo, B., Ho, L. C, The connection between jets, accretion disk, and black hole mass in blazars, Astrophysical Journal, 2004, 615, L9
    [53] Cao, X. W., Are the jets accelerated from the disk coronas in some AGNs?, Astro-physical Journal, 2004, 613, 716
    [54] Atoyan, A. & Dermer, C. D., Synchrotron versus Compton Interpretations for Extended X-Ray Jets, Astrophysical Journal, 2004, 613:151-158
    [55] Celotti, A. & Fabian, A. C., The Kinetic Power and Luminosity of Parsecscale Radio Jets - an Argument for Heavy Jets, Monthly Notices of the Royal Astronomical Society, 1993, 264:228
    [56] Krawczynski, H., Coppi, P. S., Aharonian, F., Time-dependent modelling of the Markarian 501 X-ray and TeV gamma-ray data taken during 1997 March and April. Monthly Notices of the Royal Astronomical Society, 2002, 336:721-735
    [57] Kino, M., Takahara, F., Kusunose, M., Energetics of TeV Blazars and Physical Constraints on Their Emission Regions, Astrophysical Journal, 2002. 564:97-107
    [58] Swain, M. R., Bridle, A. H., Baum, S. A., Internal Structure of the Jets in 3C 353. Astrophysical Journal, 1998, 507:L29-L33
    [59] Laing, R. A. & Bridle, A. H., Adiabatic relativistic models for the jets in the radio galaxy 3C 31, Monthly Notices of the Royal Astronomical Society, 2004, 348:1459-1472
    [60] Lara, L., Giovannini, G., Cotton, W. D., The inner kiloparsec of the jet in 3C 264, Astronomy and Astrophysics, 2004, 415:905-913
    [61] Pushkarev, A. B., Gabuzda. D. C., Vetukhnovskaya, Y. N., Yakimov, V. E., Spine-sheath polarization structures in four active galactic nuclei jets, Monthly Notices of the Royal Astronomical Society, 2005, 356:859-871
    [62] Chiaberge, M., Celotti, A., Capetti, A., Ghisellini, G., Does the unification of BL Lac and FR I radio galaxies require jet velocity structures?, Astronomy and Astrophysics, 2000, 358:104-112
    [63] Ghisellini, G., Tavecchio, F., Chiaberge, M., Structured jets in TeV BL Lac objects and radiogalaxies. Implications for the observed properties, Astronomy and Astrophysics, 2005, 432:401-410
    [64] Meisenheimer, K., Yates. M. G., Roeser, H. J., The synchrotron spectra of radio hot spots. Ⅱ. Infrared imaging, Astronomy and Astrophysics, 1997, 325:57-73
    [65] Kraft, R. P., Hardcastle, M. J., Worrall, D. M., Murray, S. S., A Chandra Study of the Multicomponent X-Ray Emission from the X-shaped Radio Galaxy 3C 403, Astrophysical Journal, 2005, 622:149-159
    [66] Biretta, J. A. & Meisenheimer, K., The Jet of M 87, In Jets in Extragalactic Radio Sources, 1993, 421, 159
    [67] Hardcastle, M. J., Alexander, P., Pooley, G. G., Riley, J. M., The jets in 3C 66B, Monthly Notices of the Royal Astronomical Society, 1996, 278:273-284
    [68] Hardcastle, M. J., Birkinshaw, M., Worrall, D. M., Chandra observations of the X-ray jet in 3C 66B, Monthly Notices of the Royal Astronomical Society, 2001, 326:1499-1507
    [69] Hartman, R. C., Bertsch, D. L., Bloom, S. D. et al., The Third EGRET Catalog of High-Energy Gamma-Ray Sources, Astrophysical Journal Supplement Series, 1999, 123:79-202
    [70] Collmar, W., Bennett, K., Bloemen, H. et al., COMPTEL observations of the quasar PKS 0528+134 during the first 3.5 years of the CGRO mission, Astronomy and Astrophysics, 1997, 328:33-42
    [71] Collmar, W., Bennett, K., Bloemen, H. et al., COMPTEL Observations of AGN at Mev-Energies, Astrophysical Letters Communications, 1999, 39:57
    [72] Collmar, W., Schonfelder, V., Bloemen, H. et al., Evidence for gamma Ray Flares In 3C 279 and PKS 1622-297 at ~10 MeV, AIP Conference, 1997, 410, 1341
    [73] Collmar, W., The MeV-View on Blazars, In High Energy Blazar Astronomy, 2003, 299, 29
    [74] Abdo, A. A., Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey, 2009, Submitted to ApJ, (arXiv:0902.1559)
    [75] Cao, X. W. & Bai, J. M., How many radio-loud quasars can be detected by the gamma-ray large area space telescope? Astrophysical Journal, 2008, 673, L131
    [76] McEnery, J. E., Moskalenko, I. V., Ormes, J. F., GLAST: Understanding the high energy gamma-ray sky, In Cosmic Gamma-Ray Sources, 2004, 304, 361
    [77] Weekes, T. C., TeV Gamma-ray Astronomy: The Story So Far, In American Institute of Physics Conference Series, 2008, 1085, 3-17
    [78] Holder, J., Acciari, V. A., Aliu, E., Status of the VERITAS Observatory, In American Institute of Physics Conference Series, 2008, 1085, 657-660
    [79] Hofmann. W., H.E.S.S. highlights, In International Cosmic Ray Conference, 2005, 10, 97
    [80] de Angelis, A., Mansutti, O., Persic, M., Very-high energy gamma astrophysics, Nuovo Cimento Rivista Serie, 2008, 31:187-246
    [81] Krawczynski, H., TeV blazars - observations and models, New Astronomy Review, 2004, 48:367-373
    [82] Krawczynski, H., Sambruna, R., Kohnle, A., et al., Simultaneous X-Ray and TeV Gamma-Ray Observation of the TeV Blazar Markarian 421 during 2000 February and May, Astrophysical Journal 2001, 559, 187
    [83] Gaidos, J. A., Akerlof. C. W., Biller, S. D. et al., Very Rapid and Energetic Bursts of TeV Photons from the Active Galaxy Markarian 421, Nature, 1996, 383:319
    [84] Buckley. J. H., Akerlof, C. W., Biller, S. et al., Gamma-Ray Variability of the BL Lacertae Object Markarian 421, Astrophysical Journal, 1996, 472:L9
    [85] Takahashi, T., Tashiro. M., Madejski, G. et al., ASCA Observation of an X-Ray/TeV Flare from the BL Lacertae Object Markarian 421, Astrophysical Journal, 1996, 470:L89
    [86] Takahashi, T., Kataoka, J., Madejski. G. et al., Complex Spectral Variability from Intensive Multiwavelength Monitoring of Markarian 421 in 1998, Astrophysical Journal 2000, 542:L105-L109
    [87] Blazejowski, M., Blaylock, G., Bond, I. H. et al., A Multiwavelength View of the TeV Blazar Markarian 421: Correlated Variability, Flaring, and Spectral Evolution, Astrophysical Journal, 2005, 630:130-141
    [88] Djannati-Atai, A., Piron, F., Barrau, A. et al., Very High Energy Gamma-ray spectral properties of MKN 501 from CAT Cerenkov telescope observations in 1997, Astronomy and Astrophysics, 350:17-24
    [89] Sambruna, R. M., Aharonian, F. A., Krawczynski. H. et al., Correlated Intense X-Ray and TEV Activity of Markarian 501 in 1998 June, Astrophysical Journal, 2000, 538:127-133
    [90] Costamante, L., A brief (blazar oriented) overview on topics for multiwavelength observations with TeV photons, New Astronomy Review, 2004, 48:497-503
    [91] Punch, M., Akerlof, C. W., Cawley, M. F. et al., Detection of TeV photons from the active galaxy Markarian 421, Nature, 1992, 358:477
    [92] Bradbury, S. M., Deckers. T., Petry, D. et al., Detection of gamma-rays above 1.5TeV from MKN 501, Astronomy and Astrophysics, 1997, 320:L5-L8
    [93] Catanese, M., Akerlof, C. W., Badran, H. M. et al., Discovery of Gamma-Ray Emission above 350 GeV from the BL Lacertae Object 1ES 2344+514, Astrophysical Journal, 1998, 501:616
    [94] Holder, J., Bond. I. H., Boyle. P. J., Detection of TeV Gamma Rays from the BL Lacertae Object 1ES 1959+650 with the Whipple 10 Meter Telescope, Astrophysical Journal, 2003, 583:L9-L12
    [95] Horan, D., Badran, H. M., Bond, I. H. et al., Detection of the BL Lacertae Object H1426+428 at TeV Gamma-Ray Energies, Astrophysical Journal, 2002, 571:753-762
    [96] Aharonian, F., Akhperjanian. A. G., Aye, K. M. et al., H.E.S.S. observations of PKS 2155-304, Astronomy and Astrophysics, 2005, 430:865-875
    [97] Aharonian. F., Akhperjanian, A. G., Aye. K. M. et al., Discovery of VHE gamma rays from PKS 2005-489, Astronomy and Astrophysics, 2005, 436:L17-L20
    [98] Albert, J., Aliu, E., Anderhub. H. et al., Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4, Astrophysical Journal. 2006, 642:L119-L122
    [99] Pita, S. et al., Discovery of Very High Energy gamma - ray emission from the extreme BL Lac object H2356-309 with H.E.S.S, In International Cosmic Ray Conference, 2005, 4, 287
    [100] Tluczykont, M. et al., Discovery of > 160GeV gamma-rays from 1ES 1101-232 (z=0.186) with H.E.S.S, In International Cosmic Ray Conference, 2005, 4, 291.
    [101] Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R. et al., Evidence for VHE gamma-ray emission from the distant BL Lac PG 1553+113, Astronomy and Astrophysics, 2006, 448:L19-L23
    [102] Albert, J., Aliu, E., Anderhub, H. et al., Discovery of Very High Energy gamma-Rays from Markarian 180 Triggered by an Optical Outburst, Astrophysical Journal, 2006, 648:L105-L108
    [103] Aharonian, F., Akhperjanian. A. G. et al., New constraints on the mid-IR EBL from the HESS discovery of VHE gamma-rays from 1ES 0229+200, Astronomy and Astrophysics, 2007, 475:L9-L13
    [104] Aharonian, F., Akhperjanian, A. G. et al., Discovery of VHE gamma-rays from the distant BL Lacertae 1ES 0347-121, Astronomy and Astrophysics, 2007, 473:L25-L28
    [105] Albert, J., Aliu, E., Anderhub, H. et al., Discovery of Very High Energy gamma-Rays from 1ES 1011+496 at z = 0.212, Astrophysical Journal, 2007, 667:L21-L24
    [106] Superina, G., Benbow, W., Boutelier, T., et al., Discovery of VHE gamma-rays from the BL Lac object PKS 0548-322 with H.E.S.S., 30TH INTERNATIONAL COSMIC RAY CONFERENCE, 2007
    [107] Aharonian, F., Akhperjanian, A., Beilicke. M. et al., Is the giant radio galaxy M 87 a TeV gamma-ray emitter?, Astronomy and Astrophysics, 2003. 403:Ll-L5
    [108] Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R. et al. Fast variability of tera-electron volt rays from the radio galaxy M87, Science. 2006, 314, 1424-1427
    [109] Albert, J., Aliu, E., Anderhub, H. et al., Discovery of Very High Energy gamma-Ray Emission from the Low-Frequency-peaked BL Lacertae Object BL Lacertae. Astrophysical Journal, 2007, 666:L17-L20
    [110] Collaboration, Magic and Albert, J., Aliu, E. et al., Very-High-Energy gamma rays from a Distant Quasar: How Transparent Is the Universe?, Science, 2008, 320, 1752
    [111] Aharonian, F., Akhperjanian, A. G. et al., Discovery of VHE gamma-rays from the high-frequency-peaked BL Lacertae object RGB J0152+017, Astronomy and Astrophysics, 2008, 481:L103-L107
    [112] Teshima, M. and The Magic Collaboration, MAGIC discovers VHE gamma ray emission from the blazar S50716+714, The Astronomer's Telegram, 2008, 1500:1
    [113] Acciari, V. A., Aliu, E., Beilicke, M. et al., VERITAS Discovery of (?)200 GeV Gamma-Ray Emission from the Intermediate-Frequency-Peaked BL Lacertae Object W Comae, Astrophysical Journal, 2008, 684:L73-L77
    [114] Swordy, S., VERITAS discovers VHE gamma rays from BL Lac 1ES0806+524, The Astronomer's Telegram, 2008, 1415:1
    [115] Acciari, V. A., Aliu, E., Arlen, T. et al., Veritas Observations of a Very High Energy gamma-Ray Flare From the Blazar 3C?6A, Astrophysical Journal, 2009, 693:L104-L108
    [116] Aharonian, F., Akhperjanian. A. G., Anton. G. et al., Discovery of Very High Energy gamma-Ray Emission from Centaurus a with H.E.S.S. Astrophysical Journal, 2009, 695:L40-L44
    [117] Ong, R., VERITAS Discovery of VHE Gamma-Ray Emission from BL Lac object RGB J0710+591, The Astronomers Telegram, 2009, 1941:1
    [118] Padovani, P., Giommi, P., The connection between x-ray- and radio-selected BL Lacertae objects, Astrophysical Journal, 1995, 444:567-581
    [119] Bondi, M., March, M. J. M., Dallacasa, D., Stanghellini, C., Intermediate BL Lac objects, Monthly Notices of the Royal Astronomical Society, 2001, 325:1109-1123
    [120] Padovani, P. & Urry, C. M., Issues in Blazar Research, In Blazar Demographics and Physics, 2001, 227, 3
    [121] Fossati, G., Maraschi, L., Celotti. A. et al., A unifying view of the spectral energy distributions of blazars. Monthly Notices of the Royal Astronomical Society, 1998, 299:433-448
    [122] Wehrle, A. E., Pian, E., Urry, C. M., Maraschi, L. et al., Multiwavelength Observations of a Dramatic High-Energy Flare in the Blazar 3C 279, Astrophysical Journal 1998, 497:178
    [123] Tavecchio, F., Maraschi, L., Pian. E. et al., Theoretical Implications from the Spectral Evolution of Markarian 501 Observed with BeppoSAX. Astrophysical Journal. 2001, 554:725-733
    [124] Ghisellini, G., Celotti, A., Fossati. G. et al., A theoretical unifying scheme for gamma-ray bright blazars, Monthly Notices of the Royal Astronomical Society, 1998, 301:451-468
    [125] Ghisellini, G., Celotti, A., Costamante, L., Low power BL Lacertae objects and the blazar sequence. Clues on the particle acceleration process, Astronomy and Astrophysics, 2002, 386:833-842
    [126] Padovani, P., Perlman, E. S., Landt, H., et al. What Types of Jets Does Nature Make? A New Population of Radio Quasars, Astrophysical Journal, 2003, 588, 128
    [127] Anton, S. & Browne, I. W. A., The recognition of blazars and the blazar spectral sequence. Monthly Notices of the Royal Astronomical Society, 2005, 356, 225
    [128] Nieppola, E., Tornikoski, M., Valtaoja, E., Spectral energy distributions of a large sample of BL Lacertae objects, Astronomy and Astrophysics, 2006, 445, 441
    [129] Urry, M., BL Lac Objects and Blazars: Past, Present and Future. In BL Lac Phenomenon, 1999, 159,3
    [130] Marscher, A. P. & Gear, W. K., Models for high-frequency radio outbursts in extragalactic sources, with application to the early 1983 millimeter-to-infrared flare of 3C 273, Astrophysical Journal, 1985, 298:114-127
    [131] Maraschi, L., Ghisellini, G., Celotti, A., A jet model for the gamma-ray emitting blazar 3C 279, Astrophysical Journal, 1992, 397:L5-L9
    [132] Bloom, S. D. & Marscher. A. P., An Analysis of the Synchrotron Self-Compton Model for the Multi-Wave Band Spectra of Blazars, Astrophysical Journal, 1996. 461:657
    [133] Bottcher, M., Leptonic Jet Models of Blazars: Broadband Spectra and Spectral Variability, In American Institute of Physics Conference Series, 2000, 515, 31
    [134] Tavecchio, F., Maraschi, L., Ghisellini, G., Constraints on the Physical Parameters of TeV Blazars, Astrophysical Journal, 1998, 509:608-619
    [135] Chiaberge, M. & Ghisellini, G., Rapid variability in the synchrotron self-Compton model for blazars, Monthly Notices of the Royal Astronomical Society, 1999, 306:551-560
    [136] Crusius, A. & Schlickeiser, R., Synchrotron radiation in random magnetic fields. Astronomy and Astrophysics, 1986, 164:L16-L18
    [137] Ghisellini, G., Guilbert, P. W., Svensson, R., The synchrotron boiler, Astrophysical Journal 1988, 334:L5-L8
    [138] Ghisellini, G. & Svensson, R., The synchrotron and cyclo-synchrotron absorption cross-section, Monthly Notices of the Royal Astronomical Society, 1991, 252:313-318
    [139] Dermer, C. D., Schlickeiser, R., Mastichiadis. A., High-energy gamma radiation from extragalactic radio sources, Astronomy and Astrophysics, 1992, 256:L27-L30
    [140] Dermer, C. D. & Schlickeiser, R., Model for the High-Energy Emission from Blazars. Astrophysical Journal, 1993, 416:458
    [141] Sikora, M., Begelman, M. C., Rees, M. J., Comptonization of diffuse ambient radiation by a relativistic jet: The source of gamma rays from blazars?, Astrophysical Journal, 1994, 421:153-162
    [142] Blandford, R. D. & Levinson, A., Pair cascades in extragalactic jets. 1: Gamma rays, Astrophysical Journal, 1995, 441:79-95
    [143] Dermer, C. D., Stumer, S. J., Schlickeiser, R., Nonthermal Compton and Synchrotron Processes in the Jets of Active Galactic Nuclei, Astrophysical Journal Supplement Series, 1997, 109:103
    [144] Tavecchio, F., Maraschi, L., Sambruna, R. M., Urry, C. M., The X-Ray Jet of PKS 0637-752: Inverse Compton Radiation from the Cosmic Microwave Background?. Astrophysical Journal, 2000, 544:L23-L26
    [145] Protheroe, R. J. & Biermann, P. L., Photon-photon absorption above a molecular cloud torus in blazars, Astroparticle Physics, 1997, 6:293-300
    [146] Arbeiter, C., Pohl, M., Schlickeiser, R., The influence of dust on the inverse Compton emission from jets in Active Galactic Nuclei, Astronomy and Astrophysics, 2002. 386:415-426
    [147] Buckley, J., Burnett, T., Sinnis. G. et al., Gamma-Ray Summary Report, 2002, arXiv:0201.160
    [148] Jordan, M. and The, Veritas Collaboration. Multiwavelength Observations of Markarian 421, In International Cosmic Ray Conference, 2001, 7, 2691
    [149] Brown, L. M. J., Robson, E. I., Gear, W. K. et al., Multifrequency observations of blazars. Ⅲ - The spectral shape of the radio to X-ray continuum, Astrophysical Journal, 1989, 340:129-149
    [150] Mannheim, K., Biermann, P. L., Kruells, W. M., A novel mechanism for nonthermal X-ray emission, Astronomy and Astrophysics, 1991, 251:723-731
    [151] Mannheim, K. & Biermann, P. L., Photomeson production in active galactic nuclei, Astronomy and Astrophysics, 1989, 221:211-220
    [152] Mannheim, K. & Biermann, P. L., Gamma-ray flaring of 3C 279 - A proton-initiated cascade in the jet?, Astronomy and Astrophysics. 1992. 253:L21-L24
    [153] Biermann, P. L. & Strittmatter, P. A., Synchrotron emission from shock waves in active galactic nuclei, Astrophysical Journal, 1987, 322:643-649
    [154] Sikora, M., Kirk, J. G., Begelman, M. C., Schneider, P., Electron injection by relativistic protons in active galactic nuclei, Astrophysical Journal, 1987, 320:L81-L85
    [155] Mannheim. K., The proton blazar, Astronomy and Astrophysics, 1993, 269:67-76
    [156] Mannheim, K., gamma rays and neutrinos from a powerful cosmic accelerator, Physical Review D, 1993, 48:2408-2414
    [157] Mucke, A. & Protheroe, R. J., Modeling the April 1997 Flare of Mkn 501. In American Institute of Physics Conference Series, 2000, 515, 149
    [158] Mucke, A. & Protheroe, R. J., A proton synchrotron blazar model for flaring in Markarian 501. Astroparticle Physics, 2001, 15:121-136
    [159] Boehringer, H., Voges, W., Fabian, A. C. et al., A ROSAT HRI study of the interaction of the X-ray-emitting gas and radio lobes of NGC 1275, Monthly Notices of the Royal Astronomical Society, 1993, 264:L25-L28
    [160] Aharonian, F. A., TeV gamma rays from BL Lac objects due to synchrotron radiation of extremely high energy protons, New Astronomy, 2000, 5:377-395
    [161] Wang, J. C., Stochastic Particle Acceleration in Blazar Jets, Chinese Journal of Astronomy and Astrophysics, 2002, 2:1-7
    [162] Stawarz, L. & Ostrowski. M., Radiation from the Relativistic Jet: A Role of the Shear Boundary Layer, Astrophysical Journal, 2002, 578:763-774
    [163] Nishikawa, K. I., Hardee, P., Richardson, G. et al., Particle Acceleration and Magnetic Field Generation in Electron-Positron Relativistic Shocks, Astrophysical Journal, 2005, 622:927-937
    [164] Kataoka, J., Stawarz, L., Aharonian, F. et al., The X-Ray Jet in Centaurus A: Clues to the Jet Structure and Particle Acceleration. Astrophysical Journal, 2006, 641:158-168
    [165] Perlman, E. S., Harris, D. E., Biretta, J. A. et al., Month-Timescale Optical Variability in the M87 Jet, Astrophysical Journal, 2003, 599:L65-L68
    [166] Celotti, A., Ghisellini, G., Chiaberge. M., Large-scale jets in active galactic nuclei: multiwavelength mapping, Monthly Notices of the Royal Astronomical Society. 2001, 321, 1
    [167] Dermer, C. D. & Atoyan, A. M., X-Ray Synchrotron Spectral Hardenings from Compton and Synchrotron Losses in Extended Chandra Jets, Astrophysical Journal, 2002, 568:L81-L84
    [168] Harris, D. E. & Krawczynski, H., X-Ray Emission Processes in Radio Jets, Astrophysical Journal, 2002, 565:244-255
    [169] Hardcastle, M. J., Harris, D. E., Worrall, D. M., Birkinshaw, M., The Origins of X-Ray Emission from the Hot Spots of FR Ⅱ Radio Sources. Astrophysical Journal, 2004, 612:729-748
    [170] Kataoka, J. & Stawarz, L., X-Ray Emission Properties of Large-Scale Jets. Hot Spots, and Lobes in Active Galactic Nuclei, Astrophysical Journal, 2005, 622:797- 810
    [171] Schwartz, D. A., Marshall. H. L., Lovell, J. E. J. et al., Chandra Discovery of a 100 kiloparsec X-Ray Jet in PKS 0637-752, Astrophysical Journal, 2000, 540:L69
    [172] Harris, D. E., Hjorth, J., Sadun, A. C. et al., X-Ray Emission from the Radio Jet in 3C 120, Astrophysical Journal, 1999. 518:213-218
    [173] Sambruna, R. M., Urry, C. M., Tavecchio, F. et al., Chandra Observations of the X-Ray Jet of 3C 273, Astrophysical Journal. 2001, 549:L161-L165
    [174] Dermer, C. D. & Atoyan, A., Nonthermal Radiation Processes in X-Ray Jets. Astrophysical Journal, 2004, 611:L9-L12
    [175] Marshall, H. L., Schwartz, D. A., Lovell, J. E. J. et al., A Chandra Survey of Quasar Jets: First Results. Astrophysical Journal Supplement Series, 2005, 156:13-33
    [176] Schwartz, D. A., Marshall, H. L., Lovell, J. E. J. et al., Chandra Observations of Magnetic Fields and Relativistic Beaming in Four Quasar Jets, Astrophysical Journal, 2006, 640:592-602
    [177] Riley, J. M. & Warner, P. J., A One-Sided Jet in the Giant Quasar 4C74.26, Monthly Notices of the Royal Astronomical Society, 1990, 246:1P
    [178] Wilson, A. S., Young, A. J., Shopbell, P. L., Chandra X-Ray Observations of Pictor A: High-Energy Cosmic Rays in a Radio Galaxy, Astro-physical Journal 2001, 547:740-753
    [179] Hardcastle, M. J. & Croston, J. H., The Chandra view of extended X-ray emission from Pictor A, Monthly Notices of the Royal Astronomical Society, 2005, 363:649-660
    [180] Schwartz, D. A., X-Ray Jets as Cosmic Beacons. Astrophysical Journal, 2002, 569:L23-L26
    [181] Bassett, L. C., Brandt, W. N., Schneider, D. P. et al. Chandra Observations of Radio-Loud Quasars at z(?)4: X-Rays from the Radio Beacons of the Early Universe. Astronomical Journal, 2004. 128:523-533
    [182] Urry, C. M., Multiwavelength properties of blazars. Astroparticle Physics. 1999, 11:159-167
    [183] Giommi, P. k Padovani, P., BL Lac Reunification, Monthly Notices of the Royal Astronomical Society, 1994, 268, L51
    [184] Catanese, M. & Weekes, T. C., Very High Energy Gamma-Ray Astronomy. Publications of the Astronomical Society of the Pacific. 1999, 111:1193-1222
    [185] Mattox, J. R., Hartman, R. C., Reimer. O., A Quantitative Evaluation of Potential Radio Identifications for 3EG EGRET Sources. Astrophysical Journal Supplement Series, 2001, 135:155-175
    [186] Kerrick, A. D., Akerlof, C. W., Biller, S. et al., Upper Limits on TeV Gamma-Ray Emission from Active Galactic Nuclei, Astrophysical Journal 1995, 452:588
    [187] Wolf, M., Veranderlicher 10.1916 Comae und S Comae, Astronomische Nachrichten. 1916, 202:415
    [188] Tosti, G., Massaro, E., Takalo, L. O. et al., What is Happening in W COM (ON 231)? The Extraordinary 1998 Outburst, In BL Lac Phenomenon, 1999. 159, 149
    [189] Massaro, E., Maesano, M., Montagni, F. et al., The extraordinary optical outburst of ON 231 (W Com) in spring 1998, Astronomy and Astrophysics, 1999, 342:L49-L52
    [190] Impey, C. D. & Neugebauer, G., Energy distributions of blazars, Astronomical Journal 1988, 95:307-351
    [191] Lamer, G., Brunner. H., Staubert, R., ROSAT observations of BL Lacertae objects. Astronomy and Astrophysics, 1996, 311:384-392
    [192] Comastri, A., Fossati, G., Ghisellini. G., Molendi, S., On the Soft X-Ray Spectra of gamma -loud Blazars. Astrophysical Journal, 1997, 480:534
    [193] Worrall, D. M. & Wilkes. B. J., X-ray spectra of compact extragalactic radio sources. Astrophysical Journal, 1990, 360:396-407
    [194] Maisack, M., Mannheim, K., Geckeler, R. D. et al., A Multi-frequency campaign on the gamma-ray loud blazar W Comae, 1997, preprint, astro-ph/9706243
    [195] Tagliaferri, G., Ghisellini. G., Giommi, P. et al., The concave X-ray spectrum of the blazar ON 231: the signature of intermediate BL Lacertae objects, Astronomy and Astrophysics, 2000, 354:431-438
    [196] Bottcher, M. and Mukherjee, R. and Reimer, A., Predictions of the High-Energy Emission from BL Lacertae Objects: The Case of W Comae. Astrophysical Journal, 2002, 581:143-154
    [197] von Montigny, C., Bertsch. D. L., Chiang, J. et al., High-Energy Gamma-Ray Emission from Active Galaxies: EGRET Observations and Their Implications. Astrophysical Journal, 1995, 440:525
    [198] Sreekumar, P., Bertsch, D. L., Dingus. B. L. et al., EGRET Observations of the North Galactic Pole Region, Astrophysical Journal, 1996, 464:628
    [199] Horan, D., Badran, H. M., Bond, I. H. et al., Constraints on the Very High Energy Emission from BL Lacertae Objects, Astrophysical Journal. 2004, 603:51-61
    [200] Koratkar, A., Pian, E., Urry, C. M., Pesce, J. E., Monitoring Ly alpha Emission from the Blazar 3C 279, Astrophysical Journal, 1998, 492:173
    [201] Blazejowski, M., Sikora, M., Moderski, R., Madejski, G. M., Comptonization of Infrared Radiation from Hot Dust by Relativistic Jets in Quasars. Astrophysical Journal, 2000, 545:107-116
    [202] Burbidge, G. R., Jones, T. W., Odell, S. L., Physics of compact nonthermal sources. Ⅲ - Energetic considerations, Astrophysical Journal, 1974, 193:43-54
    [203] Ghisellini, G., Maraschi, L., Dondi, L., Diagnostics of Inverse-Compton models for the gamma-ray emission of 3C 279 and MKN 421, Astronomy and Astrophysics Supplement Series, 1996, 120:503
    [204] Stecker, F. W., Malkan. M. A., Scully, S. T., Intergalactic Photon Spectra from the Far-IR to the UV Lyman Limit for 0<z<6 and the Optical Depth of the Universe to High-Energy Gamma Rays, Astrophysical Journal, 2006, 648:774-783
    [205] Blandford, R. D. & Rees, M. J., A 'twin-exhaust' model for double radio sources, Monthly Notices of the Royal Astronomical Society, 1974, 169:395-415
    [206] Roeser, H. J. & Meisenheimer, K., A bright optical synchrotron counterpart of the western hot SPOT in Pictor A, Astrophysical Journal, 1987, 314:70-75
    [207] Lahteenmaki, A. & Valtaoja, E., Optical Polarization and Imaging of Hot Spots in Radio Galaxies, Astronomical Journal, 1999, 117:1168-1174
    [208] Bai, J. M. and Lee, Myung Gyoon, Are Centaurus A and M87 TEV Gamma-Ray Sources? Astrophysical Journal, 2001, 549:L173-L177
    [209] Harris, D. E., Leighly, K. M., Leahy, J. P., X-Ray Emission from a Radio Hot SPOT in 3C 390.3: Evidence for the Deflection of a Radio Jet by a Neighboring Galaxy. Astrophysical Journal. 1998, 499:L149
    [210] Worrall, D. M., Birkinshaw, M., Hardcastle, M. J., Chandra finds that X-ray jets are common in low-power radio galaxies, Monthly Notices of the Royal Astronomical Society, 2001, 326:L7-L12
    [211] Hardcastle, M. J., Birkinshaw. M., Cameron, R. A. et al., Magnetic Field Strengths in the Hot Spots and Lobes of Three Powerful Fanaroff-Riley Type Ⅱ Radio Sources. Astrophysical Journal, 2002, 581:948-973
    [212] Kataoka, J., Edwards, P., Georganopoulos, M., Takahara. F., Wagner, S., Chandra detection of hotspot and knots of 3C 303, Astronomy and Astrophysics, 2003, 399:91-97
    [213] Kino, M. & Takahara, F., Constraints on the energetics and plasma composition of relativistic jets in FR Ⅱ sources, Monthly Notices of the Royal Astronomical Society, 2004, 349:336-346
    [214] Tavecchio, F., Cerutti, R., Maraschi, L. et al., X-Ray and Optical Emission from Radio Hot Spots of Powerful Quasars, Astrophysical Journal, 2005, 630:721-728
    [215] Harris, D. E., Mossman, A. E., Walker, R. C., The X-Ray Jet of 3C 120: Evidence for a Nonstandard Synchrotron Spectrum, Astrophysical Journal. 2004. 615:161-172
    [216] Georganopoulos, M. & Kazanas, D., Relativistic and Slowing Down: The Flow in the Hot Spots of Powerful Radio Galaxies and Quasars, Astrophysical Journal, 2003, 589:L5-L8
    [217] Stanley, G. J. & Slee, O. B., Galactic Radiation at Radio Frequencies. Ⅱ. The Discrete Sources, Australian Journal of Scientific Research A Physical Sciences, 1950, 3:234
    [218] Maltby, P. & Moffet, A. T., Brightness Distribution in Discrete Radio Sources. Ⅲ. The Structure of the Sources, Astrophysical Journal Supplement Series, 1962, 7:141
    [219] Schwarz, U. J., Whiteoak, J. B., Cole, D. J., Synthesis observations of southern radio sources at 1410 MHz with the Parkes interferometer. Ⅱ - Polarization and brightness distributions across seven sources, Australian Journal of Physics, 1974, 27:563-574
    [220] Thomson, R. C., Crane, P., Mackay, C. D., Optical Structure and Polarization of the Western Hot SPOT of Pictor A, Astrophysical Journal, 1995, 446:L93
    [221] Perley, R. A., Roser, H. J., Meisenheimer. K., The radio galaxy PictorA - a study with the VLA, Astronomy and Astrophysics, 1997, 328:12-32
    [222] Tingay, S. J., Lenc, E., Brunetti, G., Bondi, M., a High Resolution View of the Jet Termination Shock in a Hot SPOT of the Nearby Radio Galaxy Pictor a: Implications for X-Ray Models of Radio Galaxy Hot Spots, Astronomical Journal. 2008, 136:2473-2482
    [223] Aharonian, F., Akhperjanian. A. G. et al., Upper limits from HESS active galacticnuclei observations in 2005-2007, Astronomy and Astrophysics, 2008, 478:387-393
    [224] Arshakian, T. G. & Longair, M. S., An asymmetric relativistic model for classical double radio sources, Monthly Notices of the Royal Astronomical Society. 2000, 311:846-860
    [225] Brunetti, G., Setti, G., Comastri, A., Inverse Compton X-rays from strong FRII radio-galaxies, Astronomy and Astrophysics, 1997, 325:898-910
    [226] Hardcastle, M. J., Birkinshaw, M., Worrall, D. M., Magnetic field strengths in the hotspots of 3C 33 and 111, Monthly Notices of the Royal Astronomical Society, 1998. 294:615
    [227] Singh, K. P., Rao, A. R., Vahia, M. N., X-Ray Observations of the Radio Galaxy Pictor-A, Monthly Notices of the Royal Astronomical Society, 1990. 246:706
    [228] Kraft, R. P., Birkinshaw, M., Hardcastle, M. J. et al., A Radio through X-Ray Study of the Hot Spots. Active Nucleus, and Environment of the Nearby FR II Radio Galaxy 3C 33, Astrophysical Journal 2007, 659:1008-1021
    [229] Stawarz, L., Cheung, C. C., Harris, D. E., Ostrowski, M., The Electron Energy Distribution in the Hotspots of Cygnus A: Filling the Gap with the Spitzer Space Telescope, Astrophysical Journal, 2007, 662:213-223
    [230] Sambruna, R. M., Donato D., Tavecchio, F. et al., Deep Chandra and Multicolor HST Observations of the Jets of 3C 371 and PKS 2201+044, Astrophysical Journal. 2007, 670:74-91
    [231] Liu, W. P. & Shen, Z. Q., A Modified Synchrotron Model for Knots in the M87 Jet. Astrophysical Journal, 2007, 668:L23-L26
    [232] Dai, Z. G., Zhang, B., Gou, L. J. et al., GeV Emission from TeV Blazars and Intergalactic Magnetic Fields, Astrophysical Journal, 2002. 580:L7-L10
    [233] Kronberg, P. P., Extragalactic magnetic fields, Reports on Progress in Physics. 1994. 57:325-382
    [234] Dennett-Thorpe, J., Bridle, A. H., Scheuer. P. A. G. et al., Asymmetry of jets. lobe length and spectral index in quasars, Monthly Notices of the Royal Astronomical Society, 1997. 289:753-765
    [235] Stawarz, L., Sikora, M., Ostrowski, M., High-Energy Gamma Rays from FR I Jets. Astrophysical Journal, 2003, 597:186-201
    [236] Gelbord, J. M., Marshall, H. L., Worrall, D. M. et al., The Knotty Question of the Jet of PKS B1421-490, Astrophysical Journal, 2005, 632:L75-L78
    [237] Godfrey, L. E. H., Bicknell, G. V., Lovell, J. E. J. et al., A Multiwavelength Study of the High Surface Brightness Hot Spot in PKS 1421-490. Astrophysical Journal. 2009, 695:707-723
    [238] Kataoka, J., Leahy, J. P., Edwards, P. G. et al., Chandra discovery of an X-ray jet and lobes in 3C 15, Astronomy and Astrophysics, 2003, 410:833-845
    [239] Donahue, M., Daly, R. A., Horner, D. J., Constraints on the Cluster Environments and Hot Spot Magnetic Field Strengths of the Radio Sources 3C 280 and 3C 254. Astrophysical Journal, 2003, 584:643-656
    [240] Harris, D. E., Nulsen, P. E. J., Ponman, T. J. et al., Chandra X-Ray Detection of the Radio Hot Spots of 3C 295, Astrophysical Journal 2000, 530:L81-L84
    [241] Jester, S., Meisenheimer, K., Martel, A. R. et al., Hubble Space Telescope farultraviolet imaging of the jet in 3C273: a common emission component from optical to X-rays, Monthly Notices of the Royal Astronomical Society, 2007, 380:828-834
    [242] Tavecchio, F., Maraschi, L., Wolter, A. et al., Chandra and Hubble Space Telescope Observations of Gamma-Ray Blazars: Comparing Jet Emission at Small and Large Scales. Astrophysical Journal, 2007, 662:900-908
    [243] Worrall, D. M. & Birkinshaw, M., X-ray synchrotron emission from the oblique shock in the jet of the powerful radio galaxy 3C346, Monthly Notices of the Royal Astronomical Society, 2005, 360:926-934
    [244] Sambruna. R. M., Gliozzi, M., Donato, D. et al., Deep Chandra and Multicolor HST Follow-up of the Jets in Two Powerful Radio Quasars, Astrophysical Journal 2006. 641:717-731
    [245] Perlman, E. S., Biretta, J. A., Sparks. W. B. et al., The Optical-Near-Infrared Spectrum of the M87 Jet fromHubble Space Telescope Observations. Astrophysical Journal 2001. 551:206-222

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