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arXiv:astro-ph/0011242 (astro-ph)
[Submitted on 13 Nov 2000]

Title:The variable XMM-Newton spectrum of Markarian 766

Authors:M.J. Page, K.O. Mason, F.J. Carrera, J. Clavel, J.S. Kaastra, E.M. Puchnarewicz, M. Santos-Lleo, H. Brunner, C. Ferrigno, I.M. George, F. Paerels, K.A. Pounds, S.P. Trudolyubov
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Abstract: The narrow-line Seyfert 1 galaxy Markarian 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 Ka 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. Markarian 766 varies by a factor of ~ 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.
Comments: 6 pages, 6 figures, Accepted by A&A for publication in the Special Issue on 1st science with XMM Newton
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011242
  (or arXiv:astro-ph/0011242v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011242
Related DOI: https://doi.org/10.1051/0004-6361%3A20000240

Submission history

From: Mathew James Page [view email]
[v1] Mon, 13 Nov 2000 11:16:56 UTC (108 KB)
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