Ludwig Biermann Award Lecture: X-ray Evidence for Supermassive Black Holes at the Centers of Nearby, Non-Active Galaxies
Abstract
We first present a short overview of X-ray probes of the black hole region of active galaxies (AGN) and then concentrate on the X-ray search for supermassive black holes (SMBHs) in optically non-active galaxies. The first part focuses on recent results from the X-ray observatories Chandra and XMM-Newton which detected a wealth of new spectral features which originate in the nuclear region of AGN. In the last few years, giant-amplitude, non-recurrent X-ray flares have been observed from several non-active galaxies. All of them share similar properties, namely: extreme X-ray softness in outburst, huge peak luminosity (up to ~10^{44} erg/s), and the absence of optical signs of Seyfert activity. Tidal disruption of a star by a supermassive black hole is the favored explanation of these unusual events. The second part provides a review of the initial X-ray observations, follow-up studies,and the relevant aspects of tidal disruption models studied in the literature.
- Publication:
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Reviews in Modern Astronomy
- Pub Date:
- 2002
- DOI:
- 10.48550/arXiv.astro-ph/0209007
- arXiv:
- arXiv:astro-ph/0209007
- Bibcode:
- 2002RvMA...15...27K
- Keywords:
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- Astrophysics
- E-Print:
- Ludwig-Biermann Award Lecture, to appear in: Reviews in Modern Astronomy 15, R. Schielicke (ed.), Springer-Verlag, p. 27-56 (2002)