| An XMM-Newton Observation of the Seyfert 1 Galaxy 1h 0419-577 in an Extreme Low State Contributor(s): Pounds, K. A. (Author), Nasa Technical Reports Server (Ntrs) (Created by), Et Al (Created by) |
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ISBN: 1287283284 ISBN-13: 9781287283287 Publisher: Bibliogov OUR PRICE: $14.18 Product Type: Paperback Published: August 2013 |
| Additional Information |
| BISAC Categories: - Political Science |
| Physical Information: 0.06" H x 7.44" W x 9.69" (0.15 lbs) 28 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: Previous observations of the luminous Seyfert 1 galaxy 1H 0419-577 have found its X-ray spectrum to range from that of a typical Seyfert 1 with 2-10 keV power law index Gamma approx. 1.9 to a much flatter power law of Gamma approx. 1.5 or less. We report here a new XMM-Newton observation which allows the low state spectrum to be studied in much greater detail than hitherto. We find a very hard spectrum (Gamma approx. 1.0), which exhibits broad features that can be modelled myth the addition of an extreme relativistic Fe K emission line or with partial covering of the underlying continuum by a substantial column density of near-neutral gas. Both the EPIC and RGS data show evidence for strong line emission of OVII and OVIII requiring an extended region of low density photoionised gas in 1H 0419-577. Comparison with an earlier XMM-Newton observation when 1H 0419-577 was 'X-ray bright' indicates the dominant spectral variability occurs via a steep power law component. |