A Chandra Observation of the Luminous NLS1 1H 0707-495

Details A Chandra Observation of the Luminous NLS1 1H 0707-495 A Chandra Observation of the Luminous NLS1 1H 0707-495

2002-05-30

arxiv.org/abs/astro-ph/0205539v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 color figures. To appear in the proceedings of the workshop "X-ray spectroscopy of AGN with Chandra and XMM-Newton"

Scientific paper

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.

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