Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/26514
 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 Links: http://hdl.handle.net/2381/26514http://www.aanda.org/articles/aa/abs/2001/01/aaxmm36/aaxmm36.html 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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