Active galactic nuclei – the physics of individual sources and the cosmic history of formation and evolution

Abstract

In this paper we give a brief review of the astrophysics of active galactic nuclei (AGNs). After a general introduction motivating the study of AGNs, we discuss our present understanding of the inner workings of the central engines, most likely accreting black holes with masses between 10⁶ and 10¹⁰ M_⊙. We highlight recent results concerning the jets (collimated outflows) of AGNs derived from X-ray observations (Chandra) of kpc-scale jets and γ-ray observations of AGNs (Fermi, Cherenkov telescopes) with jets closely aligned with the lines of sight (blazars), and discuss the interpretation of these observations. Subsequently, we summarize our knowledge about the cosmic history of AGN formation and evolution. We conclude with a description of upcoming observational opportunities.

Keywords

active galactic nuclei (AGNs) / black hole accretion / relativistic jets / cosmological evolution

References

[1] J. Magorrian, S. Tremaine, D. Richstone, R. Bender, G. Bower, A. Dressler, S. M. Faber, K. Gebhardt, R. Green, C. Grillmair, J. Kormendy, and T. Lauer, Astron. J., 1998, 115(6): 2285

[2] K. Gültekin, D. O. Richstone, K. Gebhardt, T. R. Lauer, S. Tremaine, M. C. Aller, R. Bender, A. Dressler, S. M. Faber, A. V. Filippenko, R. Green, L. C. Ho, J. Kormendy, J. Magorrian, J. Pinkney, and C. Siopis, Astrophys. J., 2009, 698(1): 198

[3] D. Psaltis, Living Rev. Relativity, 2008, 11: 9, http://www.livingreviews.org/lrr-2008-9

[4] A. A. Abdo, M. Ackermann, M. Ajello, K. Asano, , Nature, 2009, 462(7271): 331

[5] A. M. Taylor, I. Vovk, and A. Neronov, Astron. Astrophys., 2011, 529: A144

[6] A. E. Broderick, P. Chang, and C. Pfrommer, Astrophys. J., 2012, 752(1): 22

[7] B. D. Fields, S. Sarkar, , in: Review of Particle Physics, The Particle Data Group, 2012, 86: 275

[8] X. Fan, C. L. Carilli, and B. Keating, Annu. Rev. Astron. Astrophys., 2006, 44(1): 415

[9] Y. Yao, J. M. Shull, Q. D. Wang, and W. Cash, Astrophys. J., 2012, 746(2): 166

[10] M. Meyer, M. Raue, D. Mazin, and D. Horns, Astron. Astrophys., 2012, 542: A59

[11] R. A. Laing and A. H. Bridle, Mon. Not. R. Astron. Soc., 1987, 228: 557

[12] A. Finoguenov, M. Ruszkowski, C. Jones, M. Brüggen, A. Vikhlinin, and E. Mandel, Astrophys. J., 2008, 686(2): 911

[13] R. della Ceca, G. Lamorani, T. Maccacaro, A. Wolter, R. Griffiths, J. T. Stocke, and G. Setti, Astrophys. J., 1994, 430: 533

[14] K. I. Kellermann, R. C. Vermeulen, J. A. Zensus, and M. H. Cohen, Astron. J., 1998, 115(4): 1295

[15] H. L. Marshall, B. P. Miller, D. S. Davis, E. S. Perlman, M. Wise, C. R. Canizares, and D. E. Harris, Astrophys. J., 2002, 564(2): 683

[16] M. J. Hardcastle, R. P. Kraft, G. R. Sivakoff, J. L. Goodger, J. H. Croston, A. Jordán, D. A. Evans, D. M. Worrall, M. Birkinshaw, S. Raychaudhury, N. J. Brassington, W. R. Forman, W. E. Harris, C. Jones, A. M. Juett, S. S. Murray, P. E. J. Nulsen, C. L. Sarazin, and K. A. Woodley, Astrophys. J., 2007, 670(2): L81

[17] H. D. Curtis, Publications of Lick Observatory, 1918, 13: 9

[18] M. Schmidt, Nature, 1963, 197(4872): 1040

[19] F. Tavecchio, L. Maraschi, R. M. Sambruna, and C. M. Urry, Astrophys. J., 2000, 544(1): L23

[20] T. Savolainen, D. C. Homan, T. Hovatta, M. Kadler, Y. Y. Kovalev, M. L. Lister, E. Ros, and J. A. Zensus, Astron. Astrophys., 2010, 512: A24

[21] D. E. Harris and H. Krawczynski, Annu. Rev. Astron. Astrophys., 2006, 44(1): 463

[22] D. E. Harris and H. Krawczynski, Astrophys. J., 2002, 565(1): 244

[23] A. Atoyan and C. D. Dermer, Astrophys. J., 2004, 613(1): 151

[24] A. A. Abdo, M. Ackermann, M. Ajello, W. B. Atwood, , Science, 2010, 328(5979): 725

[25] R. Z. Yang, N. Sahakyan, E. de Ona Wilhelmi, F. Aharonian, and F. Rieger, Astron. Astrophys., 2012, 542: A19

[26] C. C. Cheung, Astrophys. J., 2004, 600(1): L23

[27] M. Sikora and G. Madejski, Astrophys. J., 2000, 534(1): 109

[28] A. Celotti and A. C. Fabian, Mon. Not. R. Astron. Soc., 1993, 264: 228

[29] G. Ghisellini, Mon. Not. R. Astron. Soc., 2012, 424(1): L26

[30] H. Boehringer, , Mon. Not. R. Astron. Soc., 1993, 264: L25

[31] C. L. Carilli, R. A. Perley, and D. E. Harris, Mon. Not. R. Astron. Soc., 1994, 270: 173

[32] A. C. Fabian, J. S. Sanders, G. B. Taylor, S. W. Allen, C. S. Crawford, R. M. Johnstone, and K. Iwasawa, Mon. Not. R. Astron. Soc., 2006, 366(2): 417

[33] B. R. McNamara and P. E. J. Nulsen, New J. Phys., 2012, 14(5): 055023

[34] L. Bîrzan, B. R. McNamara, P. E. J. Nulsen, C. L. Carilli, and M. W. Wise, Astrophys. J., 2008, 686(2): 859

[35] M. J. Rees, Nature, 1971, 229(5283): 312

[36] M. S. Longair, M. Ryle, and P. A. G. Scheuer, Mon. Not. R. Astron. Soc., 1973, 164: 243

[37] P. A. G. Scheuer, Mon. Not. R. Astron. Soc., 1974, 166: 513

[38] R. D. Blandford and M. J. Rees, Mon. Not. R. Astron. Soc., 1974, 169: 395

[39] M. A. Aloy and P. Mimica, in: Relativistic Jets from Active Galactic Nuclei, edited by M. Boettcher, D. E. Harris, and H. Krawczynski, Wiley-VCH, 2012: 297

[40] J. C. McKinney, A. Tchekhovskoy, and R. D. Blandford, Mon. Not. R. Astron. Soc., 2012, 423(4): 3083

[41] J. C. McKinney and R. D. Blandford, Mon. Not. R. Astron. Soc., 2009, 394(1): L126

[42] L. Sironi and A. Spitkovsky, Astrophys. J., 2011, 726(2): 75

[43] C. M. Urry and P. Padovani, Astronomical Society of the Pacific, 1995, 107: 803

[44] B. Czerny and M. Elvis, Astrophys. J., 1987, 321: 305

[45] A. Koratkar and O. Blaes, The Publications of the Astronomical Society of the Pacific, 1999, 111(755): 1

[46] S. Ichimaru, Astrophys. J., 1977, 214: 840

[47] R. Narayan, E. Quataert, I. V. Igumenshchev, and M. A. Abramowicz, Astrophys. J., 2002, 577(1): 295

[48] G. Henri and P. O. Petrucci, Astron. Astrophys., 1997, 326: 87

[49] J. Malzac, , Astron. Astrophys., 1998, 336: 807

[50] A. A. Galeev, R. Rosner, and G. S. Vaiana, Astrophys. J., 1979, 229: 318

[51] A. C. Fabian, , Mon. Not. R. Astron. Soc., 1989, 238: 729

[52] C. S. Reynolds and M. A. Nowak, Phys. Rep., 2003, 377(6): 389

[53] R. R. Ross and A. C. Fabian, Mon. Not. R. Astron. Soc., 2005, 358(1): 211

[54] R. R. Ross and A. C. Fabian, Mon. Not. R. Astron. Soc., 2007, 381(4): 1697

[55] L. W. Brenneman and C. S. Reynolds, Astrophys. J., 2006, 652(2): 1028

[56] S. S. Doeleman, J. Weintroub, A. E. E. Rogers, R. Plambeck, , Nature, 2008, 455(7209): 78

[57] M. P. Véron-Cetty and P. Véron, Astron. Astrophys. Rev., 2000, 10(1-2): 81

[58] B. M. Peterson, in: The Central Engine of Active Galactic Nuclei, edited by Luis C. Ho and Jian-Min Wang, Astronomical Society of the Pacific, 2007, 373: 3

[59] S. Kaspi, in: The Central Engine of Active Galactic Nuclei, edited by Luis C. Ho and Jian-Min Wang, Astronomical Society of the Pacific, 2007, 373: 13

[60] S. Rawlings and R. Saunders, Nature, 1991, 349(6305): 138

[61] A. Celotti, , Mon. Not. R. Astron. Soc., 1997, 286: 415

[62] L. Maraschi and F. Tavecchio, Astrophys. J., 2003, 593(2): 667

[63] N. Kawakatu, T. Nagao, and J. H. Woo, Astrophys. J., 2009, 693(2): 1686

[64] M. Elitzur, in: The Central Engine of Active Galactic Nuclei, edited by Luis C. Ho and Jian-MinWang, Astronomical Society of the Pacific, 2007, 373: 415

[65] M. Nenkova, M. M. Sirocky, R. Nikutta, Ž. Ivezić, and M. Elitzur, Astrophys. J., 2008, 685(1): 160

[66] D. Chelouche, in: The Central Engine of Active Galactic Nuclei, edited by Luis C. Ho and Jian-MinWang, Astronomical Society of the Pacific, 2007, 373: 277

[67] M. Stickel, J. W. Fried, H. Kuehr, P. Padovani, and C. M. Urry, Astrophys. J., 1991, 374: 431

[68] J. T. Stocke, S. L. Morris, I. M. Gioia, T. Maccacaro, R. Schild, A. Wolter, T. A. Fleming, and J. P. Henry, Astrophys. J. Suppl., 1991, 76: 813

[69] G. Ghisellini, F. Tavecchio, L. Foschini, and G. Ghirlanda, Mon. Not. R. Astron. Soc., 2011, 414(3): 2674

[70] P. Giommi, P. Padovani, G. Polenta, S. Turriziani, V. D’Elia, and S. Piranomonte, Mon. Not. R. Astron. Soc., 2012, 420(4): 2899

[71] W. B. Atwood, A. A. Abdo, M. Ackermann, W. Althouse, , Astrophys. J., 2009, 697(2): 1071

[72] F. Aharonian, J. Buckley, T. Kifune, and G. Sinnis, Rep. Prog. Phys., 2008, 71(9): 096901

[73] A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, , Astrophys. J., 2011, 736(2): 131

[74] A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, , Astrophys. J., 2011, 727(2): 129

[75] P. L. Nolan, A. A. Abdo, M. Ackermann, M. Ajello, , Astrophys. J. Suppl., 2012, 199(2): 31

[76] M. Ajello, M. S. Shaw, R. W. Romani, C. D. Dermer, L. Costamante, O. G. King, W. Max-Moerbeck, A. Readhead, A. Reimer, J. L. Richards, and M. Stevenson, Astrophys. J., 2012, 751(2): 108

[77] G. Fossati, L. Maraschi, A. Celotti, A. Comastri, and G. Ghisellini, Mon. Not. R. Astron. Soc., 1998, 299(2): 433

[78] G. Ghisellini, A. Celotti, G. Fossati, L. Maraschi, and A. Comastri, Mon. Not. R. Astron. Soc., 1998, 301(2): 451

[79] H. Krawczynski, R. Sambruna, A. Kohnle, P. S. Coppi, , Astrophys. J., 2001, 559(1): 187

[80] A. Konopelko, A. Mastichiadis, J. Kirk, O. C. de Jager, and F. W. Stecker, Astrophys. J., 2003, 597(2): 851

[81] J. A. Gaidos, C. W. Akerlof, S. Biller, P. J. Boyle, , Nature, 1996, 383(6598): 319

[82] F. Aharonian, A. G. Akhperjanian, A. R. Bazer-Bachi, B. Behera, , Astrophys. J., 2007, 664(2): L71

[83] J. Albert, E. Aliu, H. Anderhub, P. Antoranz, , Astrophys. J., 2007, 669(2): 862

[84] M. C. Begelman, A. C. Fabian, and M. J. Rees, Mon. Not. R. Astron. Soc., 2008, 384(1): L19

[85] V. A. Acciari, E. Aliu, T. Arlen, T. Aune, , Astrophys. J., 2011, 738(1): 25

[86] J. Aleksić, E. A. Alvarez, L. A. Antonelli, P. Antoranz, , Astron. Astrophys., 2012, 544: A142

[87] H. Krawczynski, S. B. Hughes, D. Horan, F. Aharonian, M. F. Aller, H. Aller, P. Boltwood, J. Buckley, P. Coppi, G. Fossati, N. Gotting, J. Holder, D. Horns, O. M. Kurtanidze, A. P. Marscher, M. Nikolashvili, R. A. Remillard, A. Sadun, and M. Schroder, Astrophys. J., 2004, 601(1): 151

[88] A. Abramowski, . [HESS Collaboration], Astron. Astrophys., 2012, 539: A149

[89] M. Georganopoulos and D. Kazanas, New Astron. Rev., 2004, 48(5-6): 403

[90] G. Ghisellini, F. Tavecchio, and M. Chiaberge, Astron. Astrophys., 2005, 432(2): 401

[91] A. A. Abdo, M. Ackermann, I. Agudo, M. Ajello, , Astrophys. J., 2010, 716(1): 30

[92] P. Giommi, G. Polenta, A. Lähteenmäki, D. J. Thompson, , Astron. Astrophys., 2012, 541: A160

[93] G. Fossati, J. H. Buckley, I. H. Bond, S. M. Bradbury, , Astrophys. J., 2008, 677(2): 906

[94] G. Ghirlanda, G. Ghisellini, F. Tavecchio, L. Foschini, and G. Bonnoli, Mon. Not. R. Astron. Soc., 2011, 413(2): 852

[95] M. Ackermann, M. Ajello, A. Allafort, E. Angelakis, , Astrophys. J., 2011, 741(1): 30

[96] E. Nieppola, M. Tornikoski, E. Valtaoja, J. Lón-Tavares, T. Hovatta, A. Lähteenmäki, and J. Tammi, Astron. Astrophys., 2011, 535: A69

[97] H. Krawczynski, , Astron. Astrophys., 2000, 353: 97

[98] A. P. Marscher, S. G. Jorstad, F. D. D’Arcangelo, P. S. Smith, , Nature, 2008, 452(7190): 966

[99] A. A. Abdo, M. Ackermann, M. Ajello, M. Axelsson, , Nature, 2010, 463(7283): 919

[100] J. G. Kirk and A. Mastichiadis, Astropart. Phys., 1999, 11(1-2): 45

[101] T. Takahashi, J. Kataoka, G. Madejski, J. Mattox, , Astrophys. J., 2000, 542(2): L105

[102] M. G. Garson, B. G. Baring, and H. Krawczynski, Astrophys. J., 2010, 722(1): 358

[103] K. Mannheim, Astron. Astrophys., 1993, 269: 67

[104] A. Mücke, R. J. Protheroe, R. Engel, J. P. Rachen, and T. Stanev, Astropart. Phys., 2003, 18(6): 593

[105] F. A. Aharonian, New Astron., 2000, 5(7): 377

[106] A. Reimer, J. Phys. Conf. Ser., 2012, 355: 012011

[107] M. Boettcher, arXiv: 1205.0539, 2012

[108] P. F. Hopkins, Mon. Not. R. Astron. Soc., 2012, 420: L8

[109] N. I. Shakura and R. A. Sunyaev, Astron. Astrophys., 1973, 24: 337

[110] D. N. Page and K. S. Thorne, Astrophys. J., 1974, 191: 499

[111] S. A. Balbus and J. F. Hawley, Astrophys. J., 1991, 376: 214

[112] R. Narayan and I. Yi, Astrophys. J., 1994, 428: L13

[113] R. Narayan, I. V. Igumenshchev, and M. A. Abramowicz, Astrophys. J., 2000, 539(2): 798

[114] E. Quataert and A. Gruzinov, Astrophys. J., 2000, 539(2): 809

[115] R. D. Blandford and M. C. Begelman, Mon. Not. R. Astron. Soc., 1999, 303(1): L1

[116] M. C. Begelman, Mon. Not. R. Astron. Soc., 2012, 420(4): 2912

[117] R. D. Blandford and R. L. Znajek, Mon. Not. R. Astron. Soc., 1977, 179: 433

[118] S. C. Noble, J. H. Krolik, J. D. Schnittman, and J. F. Hawley, Astrophys. J., 2011, 743(2): 115

[119] R. F. Penna, A. Sä Dowski, and J. C. McKinney, Mon. Not. R. Astron. Soc., 2012, 420(1): 684

[120] J. C. McKinney and R. Narayan, Mon. Not. R. Astron. Soc., 2007, 375(2): 513

[121] K. Beckwith, J. F. Hawley, and J. H. Krolik, Astrophys. J., 2008, 678(2): 1180

[122] M. Rees, Proceedings of the Symposium, Bad Muen-Stereifel, West Germany, 1978, 1(1): 237

[123] M. Volonteri, Astron. Astrophys. Rev., 2010, 18(3): 279

[124] C. Willott, , Astron. J., 2010, 140: 546

[125] D. Mortlock, S. J. Warren, B. P. Venemans, M. Patel, P. C. Hewett, R. G. McMahon, C. Simpson, T. Theuns, E. A. Gonzáles-Solares, A. Adamson, S. Dye, N. C. Hambly, P. Hirst, M. J. Irwin, E. Kuiper, A. Lawrence, and H. J. A. Röttgering, Nature, 2011, 474(7353): 616

[126] V. Bromm and A. Loeb, Astrophys. J., 2003, 596(1): 34

[127] B. Devecchi and M. Volonteri, Astrophys. J., 2009, 694(1): 302

[128] D. Lynden-Bell, Nature, 1969, 223(5207): 690

[129] A. Soltan, Mon. Not. R. Astron. Soc., 1982, 200: 115

[130] E. Treister, P. Natarajan, D. B. Sanders, C. M. Urry, K. Schawinski, and J. Kartaltepe, Science, 2010, 328(5978): 600

[131] P. F. Hopkins and L. Hernquist, Astrophys. J. Suppl., 2006, 166(1): 1

[132] R. Antonucci, Annu. Rev. Astron. Astrophys., 1993, 31(1): 473

[133] A. Lawrence, Mon. Not. R. Astron. Soc., 1991, 252: 586

[134] E. Treister and C. M. Urry, Astrophys. J., 2006, 652(2): L79

[135] R. C. Hickox and M. Markevitch, Astrophys. J., 2006, 645(1): 95

[136] R. Mushotzky, L. L. Cowie, A. J. Barger, and K. A. Arnaud, Nature, 2000, 404(6777): 459

[137] G. Setti and L. Woltjer, Astron. Astrophys., 1989, 224: L21

[138] E. Treister, C. M. Urry, and S. Virani, Astrophys. J., 2009, 696(1): 110

[139] A. R. Draper and D. R. Ballantyne, Astrophys. J., 2009, 707(1): 778

[140] D. Burlon, M. Ajello, J. Greiner, A. Comastri, A. Merloni, and N. Gehrels, Astrophys. J., 2011, 728(1): 58

[141] E. Treister and C. M. Urry, Astrophys. J., 2005, 630(1): 115

[142] R. Gilli, A. Comastri, and G. Hasinger, Astron. Astrophys., 2007, 463(1): 79

[143] P. Salucci, E. Szuszkiewicz, P. Monaco, and L. Danese, Mon. Not. R. Astron. Soc., 1999, 307(3): 637

[144] Q. Yu and S. Tremaine, Mon. Not. R. Astron. Soc., 2002, 335(4): 965

[145] A. Marconi, G. Risaliti, R. Gilli, L. K. Hunt, R. Maiolino, and M. Salvati, Mon. Not. R. Astron. Soc., 2004, 351(1): 169

[146] F. Shankar, P. Salucci, G. L. Granato, G. De Zotti, and L. Danese, Mon. Not. R. Astron. Soc., 2004, 354(4): 1020

[147] P. Natarajan and E. Treister, Mon. Not. R. Astron. Soc., 2009, 393(3): 838

[148] F. Shankar, D. H. Weinberg, and J. Miralda-Escudé, Astrophys. J., 2009, 690(1): 20

[149] E. Treister, K. Schawinski, M. Volonteri, P. Natarajan, and E. Gawiser, Nature, 2011, 474(7351): 356

[150] L. L. Cowie, A. J. Barger, and G. Hasinger, arXiv: 1110.3326, 2011

[151] C. J. Willott, Astrophys. J., 2011, 742(1): L8

[152] M. Volonteri, F. Haardt, and P. Madau, Astrophys. J., 2003, 582(2): 559

[153] M. Volonteri and N. Y. Gnedin, Astrophys. J., 2009, 703(2): 2113

[154] M. Volonteri and M. C. Begelman, Mon. Not. R. Astron. Soc., 2010, 409(3): 1022

[155] P. Natarajan, Bulletin of the Astronomical Society of India, 2011, 39: 145

[156] T. Di Matteo, V. Springel, and L. Hernquist, Nature, 2005, 433(7026): 604

[157] J. E. Barnes and L. E. Hernquist, Astrophys. J., 1991, 370: L65

[158] D. Sanders, B. T. Soifer, J. H. Elias, B. F. Madore, K. Matthews, G. Neugebauer, and N. Z. Scoville, Astrophys. J., 1988, 325: 74

[159] M.M. De Robertis, H. K. C. Yee, and K. Hayhoe, Astrophys. J., 1998, 496(1): 93

[160] B. Moore, N. Katz, G. Lake, A. Dressler, and A. Oemler, Nature, 1996, 379(6566): 613

[161] J. Kormendy and C. Kennicutt, Jr., Annu. Rev. Astron. Astrophys., 2004, 42(1): 603

[162] R. Finn, C. D. Impey, and E. J. Hooper, Astrophys. J., 2001, 557(2): 578

[163] P. Hopkins and L. Hernquist, Astrophys. J., 2009, 694(1): 599

[164] E. Treister, K. Schawinski, C. M. Urry, and B. D. Simmons, Astrophys. J., 2012, 758(2): L39

[165] D. Darg, S. Kaviraj, C. J. Lintott, K. Schawinski, M. Sarzi, S. Bamford, J. Silk, D. Andreescu, P. Murray, R. C. Nichol, M. J. Raddick, A. Slosar, A. S. Szalay, D. Thomas, and J. Vandenberg, Mon. Not. R. Astron. Soc., 2010, 401(3): 1552

[166] J. Aird, K. Nandra, E. S. Laird, A. Georgakakis, M. L. N. Ashby, P. Barmby, A. L. Coil, J.S. Huang, A. M. Koekemoer, C. C. Steidel, and C. N. A. Willmer, Mon. Not. R. Astron. Soc., 2010, 401(4): 2531

[167] Y. Ueda, M. Akiyama, K. Ohta, and T. Miyaji, Astrophys. J., 2003, 598(2): 886

[168] G. Kauffmann and M. Haehnelt, Mon. Not. R. Astron. Soc., 2000, 311(3): 576

[169] T. Dahlen, B. Mobasher, M. Dickinson, H. C. Ferguson, M. Giavalisco, C. Kretchmer, and S. Ravindranath, Astrophys. J., 2007, 654(1): 172

[170] M. Cisternas, K. Jahnke, K. J. Inskip, J. Kartaltepe, , Astrophys. J., 2011, 726(2): 57

[171] K. Schawinski, E. Treister, C. M. Urry, C. N. Cardamone, B. Simmons, and S. K. Yi, Astrophys. J., 2011, 727(2): L31

[172] D. Kocevski, S. M. Faber, M. Mozena, A. M. Koekemoer, , Astrophys. J., 2012, 744: 148

[173] L. Yao, E. R. Seaquist, N. Kuno, and L. Dunne, Astrophys. J., 2003, 588(2): 771

[174] E. Treister, C. M. Urry, K. Schawinski, C. N. Cardamone, and D. B. Sanders, Astrophys. J., 2010, 722(2): L238

[175] S. Doeleman, in: Proceedings of the 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays, September 20-24, 2010. Manchester, UK. Published online at http: //pos.sissa.it/cgi-bin/reader/conf.cgi?confid=125, id.53, 2010

[176] D. Ballantyne, A. R. Draper, K. K. Madsen, J. R. Rigby, and E. Treister, Astrophys. J., 2011, 736(1): 56

[177] T. Takahashi, , in: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 2010, 7732: 77320Z

[178] M. Beilicke, , SPIE Proceedings, 2011, 8145: 240

[179] M. Pearce, , arXiv: 1106.1322, 2011

[180] H. Krawczynski, Astrophys. J., 2012, 744(1): 30

[181] J. R. Gair, A. Sesana, E. Berti, and M. Volonteri, Class. Quant. Grav., 2011, 28(9): 094018

[182] X. Barcons, Probing the growth of supermassive black holes at high redshift with IXO, 38th COSPAR Scientific Assembly, 2010, 38: 2359

[183] J. Black, , in: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 2010, 7732: 77320X

[184] M. Actis, G. Agnetta, F. Aharonian, A. Akhperjanian, , Exp. Astron., 2011, 32(3): 193

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