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Title: The highly variable X-ray spectrum of the luminous Seyfert 1 galaxy 1H 0419-577
Authors: Page, Kim L.
Pounds, K. A.
Reeves, J. N.
O'Brien, Paul T.
First Published: 11-Feb-2002
Publisher: Oxford University Press (OUP) on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2002, 330 (1), pp. L1-L5
Abstract: 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.
DOI Link: 10.1046/j.1365-8711.2002.05184.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2002 The Authors. Journal compilation © 2002 RAS. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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