Hostname: page-component-77c89778f8-m8s7h Total loading time: 0 Render date: 2024-07-20T23:05:23.864Z Has data issue: false hasContentIssue false
  • English
  • Français

X/γ-rays from Active Galactic Nuclei

Published online by Cambridge University Press:  25 May 2016

R. Svensson
R. Svensson*
Affiliation:
Stockholm Observatory, SE-133 36 Saltsjöbaden, Sweden

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Recent progress using RXTE and BeppoSAX to study the X/γ emission from radio-quiet active galactic nuclei, i.e., Seyfert galaxies, is reviewed. These satellites allow simultaneous broad-band spectra extending from 0.1–200 keV to be observed for the first time and allow the various spectral components to be determined with some certainty. In particular, the new observations support the unified model of Seyfert galaxies. Most importantly, it has been found that a large fraction of Seyfert 2 galaxies have Compton-thick tori surrounding their nuclei. Spectral transitions in Seyfert galaxies are discussed, as well as recent efforts trying to synthesize the cosmic X/γ-ray background. Finally, thermal Comptonization in these sources are discussed.

Type
Part I: Talks
Information
Symposium - International Astronomical Union , Volume 195: Highly Energetic Physical Processes and Mechanisms , 2000 , pp. 143 - 152
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Antonucci, R. 1993, ARA&A, 31, 473.Google Scholar
Bassani, L., Dadina, M., Maiolino, R., Salvati, M., Risaliti, G., Delia Ceca, R., Matt, G., & Zamorani, G. 1999, ApJS, 121, 473.CrossRefGoogle Scholar
Beloborodov, A. M. 1999a, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 295.Google Scholar
Beloborodov, A. M. 1999b, ApJ, 510, L123.CrossRefGoogle Scholar
Beloborodov, A. M. 1999c, MNRAS, 305, 181.CrossRefGoogle Scholar
Beloborodov, A. M., & Poutanen, J. 1999, ApJ, 517, L77.CrossRefGoogle Scholar
Brandt, W. N. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 166.Google Scholar
Cappi, M., et al. 1999, A&A, 344, 857.Google Scholar
Chiang, J., Reynolds, C. S., Blaes, O. M., Nowak, M. A., Murray, N., Madejski, G. M., Marshall, H. L., & Magdziarz, P. 2000, ApJ, in press.Google Scholar
Coppi, P. S. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 375.Google Scholar
Dermer, C. D., & Gehrels, N. 1995, ApJ, 447, 103.CrossRefGoogle Scholar
Done, C., Madejski, G. M., & Smith, D. A. 1996, ApJ, 463, L63.CrossRefGoogle Scholar
Gilli, R., Risaliti, G., & Salvati, M. 1999, A&A, 347, 424.Google Scholar
Guainazzi, M., et al. 1998a, A&A, 339, 327.Google Scholar
Guainazzi, M., et al. 1998b, MNRAS, 301, L1.CrossRefGoogle Scholar
Guainazzi, M., et al. 1999a, MNRAS, 310, 10.CrossRefGoogle Scholar
Guainazzi, M., et al. 1999b, A&A, 341, L27.Google Scholar
Lee, J. C., Fabian, A. C., Reynolds, C. S., Brandt, W. N., & Iwasawa, K. 1999, astro-ph/9909239, preprint.Google Scholar
Leighly, K. M., Halpern, J. H., Awaki, H., Cappi, M., Ueno, S., & Siebert, J. 1999, ApJ, 522, 209.CrossRefGoogle Scholar
Madejski, G. M. 1999, in Theory of Black Hole Accretion Discs, eds. Abramowicz, M. A., Björnsson, G., & Pringle, J. (Cambridge: Cambridge Univ. Press), 21.Google Scholar
Maiolino, R., Salvati, M., Bassani, L., Dadina, L., Delia Ceca, R., Matt, G., Risaliti, G., & Zamorani, G. 1998, A&A, 338, 781.Google Scholar
Malaguti, G., et al. 1998, A&A, 331, 519.Google Scholar
Matt, G. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 149.Google Scholar
Matt, G., Pompilio, F., & La Franca, F. 1999, New Astronomy, 4, 191.CrossRefGoogle Scholar
Matt, G., et al. 1996, MNRAS, 281, L69.CrossRefGoogle Scholar
Matt, G., et al. 1997, A&A, 325, L13.Google Scholar
Perola, G. C., et al. 1999, A&A, 351, 937.Google Scholar
Piro, L., et al. 1998, in Nucl. Phys. B (Proc. Suppl.), 69, The Active X-ray Sky, 481.CrossRefGoogle Scholar
Pompilio, F., La Franca, F., & Matt, G. 2000, A&A, 353, 440.Google Scholar
Pounds, K. A., Done, C., & Osborne, J. P. 1995, MNRAS, 277, L5.Google Scholar
Poutanen, J. 1998, in AIP Conf. Proc., 431, Accretion Processes in Astrophysical Systems: Some Like It Hot!, eds. Holt, S. S. & Kallman, T. (New York: AIP), 89.Google Scholar
Poutanen, J. 1999, in Theory of Black Hole Accretion Discs, eds. Abramowicz, M. A., Björnsson, G., & Pringle, J. (Cambridge: Cambridge Univ. Press), 100.Google Scholar
Poutanen, J., Sikora, M., Begelman, M. C., & Magdziarz, P. 1996, ApJ, 465, L107.CrossRefGoogle Scholar
Poutanen, J., & Svensson, R. 1996, ApJ, 470, 249.CrossRefGoogle Scholar
Reynolds, C. S. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 178.Google Scholar
Risaliti, G., Maiolino, R., & Salvati, M. 1999, ApJ, 522, 157.CrossRefGoogle Scholar
Ryde, F., Poutanen, J., Svensson, R., Larsson, S., & Ueno, S. 1997, A&A, 328, 69.Google Scholar
Smith, D. A., & Done, C. 1996, MNRAS, 280, 355.CrossRefGoogle Scholar
Stecker, F. W., Salamon, M. H., & Done, C. 1999, astro-ph/9912106, preprint.Google Scholar
Stern, B. E. 1985, Soviet Ast., 29, 306.Google Scholar
Stern, B. E., Begelman, M. C., Sikora, M., & Svensson, R. 1995a, MNRAS, 272, 291.CrossRefGoogle Scholar
Stern, B. E., Poutanen, J., Svensson, R., Sikora, M., & Begelman, M. C. 1995b, ApJ, 449, L13.CrossRefGoogle Scholar
Svensson, R. 1984, MNRAS, 209, 175.CrossRefGoogle Scholar
Svensson, R. 1994, ApJS, 92, 585.CrossRefGoogle Scholar
Svensson, R. 1996, A&AS, 120, C475.Google Scholar
Svensson, R. 1997, in Relativistic Astrophysics, eds. Jones, B. J. T. & Markovic, D. (Cambridge: Cambridge Univ. Press), 235.Google Scholar
Svensson, R. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 361.Google Scholar
Taniguchi, Y., Murayama, T., & Nagao, T. 1999, astro-ph/9910036, preprint.Google Scholar
Uttley, P., McHardy, I. M., Papadakis, I. E., Guainazzi, M., & Fruscione, A. 1999, MNRAS, 307, L6.CrossRefGoogle Scholar
Vaughan, S., Reeves, J., Warwick, R., & Edelson, R. 1999, MNRAS, 309, 113.CrossRefGoogle Scholar
Weaver, K. A., Nousek, J., Yaqoob, T., Mushotzky, R. F., Makino, F., & Otani, C. 1996, ApJ, 458, 160.CrossRefGoogle Scholar
Zdziarski, A. A. 1999, in ASP Conf. Ser. Vol. 161, High Energy Proc. in Accreting B. H., eds. Poutanen, J. & Svensson, R. (San Francisco: ASP), 16.Google Scholar
Zdziarski, A. A. 2000, these Proceedings.Google Scholar
Zdziarski, A. A., Lubiński, P., & Smith, D. A. 1999, MNRAS, 303, L11.CrossRefGoogle Scholar