• Corpus ID: 119439560

X-ray Evidence for Supermassive Black Holes at the Centers of Nearby Galaxies

@article{Komossa2002XrayEF,
  title={X-ray Evidence for Supermassive Black Holes at the Centers of Nearby Galaxies},
  author={Stefanie Komossa},
  journal={arXiv: Astrophysics},
  year={2002}
}

• S. Komossa
• Published 31 August 2002
• Physics
• arXiv: Astrophysics

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.