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Title: The variable XMM-Newton spectrum of Markarian 766
Authors: Page, M. J.
Mason, K. O.
Puchnarewicz, E. M.
Carrera, F. J.
Clavel, J.
Santos-Lleo, M.
Kaastra, J. S.
Ferrigno, C.
Paerels, F.
Brunner, H.
George, I. M.
Pounds, K. A.
Trudolyubov, S. P.
First Published: Jan-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 365 (1)
Abstract: The narrow-line Seyfert 1 galaxy Mrk 766 was observed for 60 ks with the XMM-Newton observatory. The source shows a complex X-ray spectrum. The 2-10 keV spectrum can be adequately represented by a power law and broad Fe K$\alpha$ emission. Between 0.7 and 2 keV the spectrum is harder and exhibits a flux deficit with respect to the extrapolated medium energy slope. Below 0.7 keV, however, there is a strong excess of emission. The RGS spectrum shows an edge-like feature at 0.7 keV; the energy of this feature is inconsistent with that expected for an OVII edge from a warm absorber. Mrk 766 varies by a factor of $\sim$2 in overall count rate in the EPIC and RGS instruments on a timescale of a few thousand seconds, while no significant flux changes are observed in the ultraviolet with the OM. The X-ray variability is spectrally dependent with the largest amplitude variability occurring in the 0.4-2 keV band. The spectral variability can be explained by a change in flux and slope of the medium energy continuum emission, superimposed on a less variable (or constant) low energy emission component.
DOI Link: 10.1051/0004-6361:20000240
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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