Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-20T04:39:55.446Z Has data issue: false hasContentIssue false
  • English
  • Français

X-Ray Variability of Active Galactic Nuclei

Published online by Cambridge University Press:  30 March 2016

Daniel A. Schwartz ,
Greg Madejski  and
William H.-M. Ku
Daniel A. Schwartz
Affiliation:
Harvard/Smithsonian Center for Astrophysics
Greg Madejski
Affiliation:
Harvard/Smithsonian Center for Astrophysics
William H.-M. Ku
Affiliation:
Columbia Astrophysics Laboratory

Extract

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.

X-ray variability of active galactic nuclei is commonplace on scales from days to years. It also occurs, although rarely, on time scales as short as 200 seconds. Both these statements must be strongly qualified by the irregularity and insensitivity of the available observations. In the X-rays we expect that we are seeing deep within the active nucleus, near what is usually taken to be a massive black hole. The X-ray variability time scales may then give us the fundamental structural length scales. We would like to review data on active galaxies, present our new data on Einstein observations of BL Lac objects, and discuss all these in terms of a statistical quantification of the observations.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 6: Highlights of Astronomy. As presented at the XVIIIth General Assembly of the IAU, 1982 , 1983 , pp. 499 - 503
Copyright
Copyright © Reidel 1983

References

Bradt, H.V., et al. 1979, Ap. J. (Letters), 230, L5.CrossRefGoogle Scholar
Cavallo, G., and Rees, M.J. 1978, M.N.R.A.S., 183, 359.CrossRefGoogle Scholar
Charles, P., Thorstensen, J. and Bowyer, S. 1979, Nature, 281, 285.CrossRefGoogle Scholar
Dower, R.G., et al. 1980, Ap. J., 235, 355.CrossRefGoogle Scholar
Elvis, , et al. 1978, M.N.R.A.S. 183, 129.CrossRefGoogle Scholar
Fabian, A.C., 1979, Proc. R. Soc. London, A, 366, 449.Google Scholar
Maccagni, D. and Tarenghi, M. 1981, Space Sci. Rev., 30, 55.CrossRefGoogle Scholar
Marshall, N., Warwick, R.S. and Pounds, K.A. 1981, M.N.R.A.S., 194, 987.CrossRefGoogle Scholar
Matilsky, T., et el. 1982, Ap. J. (Letters), 258, LI.CrossRefGoogle Scholar
Mufson, S.L. and Hutter, D.J. 1981, Ap. J. (Letters), 248, L61.CrossRefGoogle Scholar
Mushotzky, R.F., et al., 1978, Ap. J. (Letters), 225, L115.CrossRefGoogle Scholar
Ricketts, M.J., Cooke, B.A., and Pounds, K.A. 1976, Nature, 259, 546.CrossRefGoogle Scholar
Schwartz, D.A., et al. 1979, Ap. J. (Letters), 229, L53.CrossRefGoogle Scholar
Snyder, W.A., et al. 1980, Ap. J. (Letters), 237, L11.CrossRefGoogle Scholar
Snyder, W.A., 1982, Ap. J., 259, 38.CrossRefGoogle Scholar
Tananbaum, H. 1980, in X-Rav Astronomy, Giacconi, R. and Setti, G., eds., (Dordrecht: D. Reidel), 291.Google Scholar
Tananbaum, H. 1978, Ap. J., 223, 74.CrossRefGoogle Scholar
Tananbaum, H.D. et al. 1979, Ap. J. (Letters), 234, L9.CrossRefGoogle Scholar
Tennant, A.F., et al. 1981, Ap. J., 251, 15.CrossRefGoogle Scholar
Urry, C.M., et al. 1982, Ap. J., (in press).Google Scholar
Wilson, A.S., et al. 1979, M. N.R.A.S., 187, 109.CrossRefGoogle Scholar