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The highly variable X-ray spectrum of the luminous Seyfert 1 galaxy 1H 0419-577

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journal contribution
posted on 24.10.2012, 09:21 by Kim L. Page, K. A. Pounds, J. N. Reeves, Paul T. O'Brien
An XMM-Newton observation of the luminous Seyfert 1 galaxy 1H 0419-577 is presented. We find that the spectrum is well fitted by a power law of canonical slope (Γ ~ 1:9) and three blackbody components (to model the strong soft excess). The XMM-Newton data are compared and contrasted with observations by ROSAT in 1992 and by ASCA and BeppoSAX in 1996. We find that the overall X-ray spectrum has changed substantially over the period, and suggest that the changes are driven by the soft X-ray component. When bright, as in our XMM-Newton observation, it appears that the enhanced soft flux cools the Comptonizing corona, causing the 2–10 keV power law to assume a ‘typical’ slope, in contrast to the unusually hard (‘photon-starved’) spectra observed by ASCA and BeppoSAX 4 years earlier.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2002, 330 (1), pp. L1-L5

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP) on behalf of the Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2002

Available date

24/10/2012

Publisher version

http://mnras.oxfordjournals.org/content/330/1/L1

Language

en