An XMM-Newton Observation of the Seyfert 1 Galaxy 1h 0419-577 in an Extreme Low State (Paperback) (ISBN-13: 9781287283287)

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.

Author: K. A. Pounds
ISBN-10: 1287283284
ISBN-13: 9781287283287
Publisher: Bibliogov
Language: English
Published: 08/06/2013
Pages: 28
Format: Paperback
Weight: 0.15lbs
Size: 9.69h x 7.44w x 0.06d