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S. Immler, W. N. Brandt, C. Vignali, F. E. Bauer (The Pennsylvania State University), D. M. Crenshaw (Georgia State University), J. J. Feldmeier (Case Western Reserve University), S. B. Kraemer (NASA Goddard Space Flight Center)
We report on an X-ray observation of the Seyfert 1.5 galaxy Markarian 6 obtained with the EPIC instruments onboard XMM-Newton. Archival BeppoSAX PDS data from 18-120 keV were also used to constrain the underlying hard power-law continuum. The results from our spectral analyses generally favor a double partial-covering model, although other spectral models such as absorption by a mixture of partially ionized and neutral gas cannot be firmly ruled out. We obtain a best-fit model consisting of a power law with a photon index of 1.81+0.22-0.20 and partial covering with large column densities up to NH ~ 1023 cm-2. We also detect a narrow emission line consistent with Fe K\alpha fluorescence at 6.45+0.03-0.04 keV. The equivalent width of this line is 93+26-20 eV. Our joint analyses of the XMM-Newton, archival ASCA and BeppoSAX data further provide evidence for both temporal and spectral variability during the ~ 4 year period probed by the observations.
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Bulletin of the American Astronomical Society,
© 2003. The American Astronomical Soceity.