AnXMM‐NewtonObservation of the Seyfert 1 Galaxy 1H 0419−577 in an Extreme Low State | Zendy

K. A. Pounds | Zendy; J. N. Reeves | Zendy; K. L. Page | Zendy; P. T. O’Brien | Zendy

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AnXMM‐NewtonObservation of the Seyfert 1 Galaxy 1H 0419−577 in an Extreme Low State

Author(s) -

K. A. Pounds,

J. N. Reeves,

K. L. Page,

P. T. O’Brien

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/382678

Subject(s) - physics , astrophysics , galaxy , spectral line , power law , epic , line (geometry) , emission spectrum , astronomy , geometry , art , statistics , mathematics , literature

Previous observations of the luminous Seyfert 1 galaxy 1H 0419-577 have foundits X-ray spectrum to range from that of a typical Seyfert 1 with 2-10 keVpower law index Gamma ~ 1.9 to a much flatter power law of Gamma ~ 1.5 or less.We report here a new XMM-Newton observation which allows the low state spectrumto be studied in much greater detail than hitherto. We find a very hardspectrum (Gamma ~ 1.0), which exhibits broad features that can be modelled withthe addition of an extreme relativistic Fe K emission line or with partialcovering of the underlying continuum by a substantial column density ofnear-neutral gas. Both the EPIC and RGS data show evidence for strong lineemission of OVII and OVIII requiring an extended region of low densityphotoionised gas in 1H 0419-577. Comparison with an earlier XMM-Newtonobservation when 1H 0419-577 was 'X-ray bright' indicates the dominant spectralvariability occurs via a steep power law component.Comment: 25 pages, 8 figures, accepted by Ap

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