2002/05/30 by Karen M. Leighly, A. A. Zdziarski, Leighly, Karen M. +7
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0205539
4 pages, 5 color figures. To appear in the proceedings of the workshop "X-ray spectroscopy of AGN with Chandra and XMM-Newton", eds., Th. Boller, S. Komossa, S. Kahn, and H. Kunieda
arxiv created 2002/05/30 · openalex publication_date 2002/05/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present preliminary results from a long Chandra HETG observation of the luminous Narrow-line Seyfert 1 galaxy 1H 0707-495. We find a complex X-ray spectrum comprised of a two-component continuum with superimposed emission and absorption lines. The short time scale X-ray variability is different than observed in other AGN: the soft X-rays vary markedly less than the hard X-rays. This behavior is similar to that of high-state Galactic black holes. We also investigated the long time scale variability, and discovered an apparent bimodal flux distribution. We postulate that the bimodality is the signature of the radiation pressure instability, and note that this instability may be expected in luminous NLS1s.