2012ApJ...759...63R -
Astrophys. J., 759, 63 (2012/November-1)
A Suzaku observation of Mkn 590 reveals a vanishing soft excess.
RIVERS E., MARKOWITZ A., DURO R. and ROTHSCHILD R.
Abstract (from CDS):
We have analyzed a long-look Suzaku observation of the Seyfert 1.2 Mkn 590. We aimed to measure the Compton reflection strength, Fe K complex properties, and soft excess emission as had been observed previously in this source. The Compton reflection strength was measured to be in the range 0.2-1.0 depending on the model used. A moderately strong Fe Kα emission line was detected with an equivalent width of ∼120±25 eV and an Fe Kβ line was identified with an equivalent width of ∼30±20 eV, although we could not rule out contribution from ionized Fe emission at this energy. Surprisingly, we found no evidence for soft excess emission. Comparing our results with a 2004 observation from XMM-Newton we found that either the soft excess has decreased by a factor of 20-30 in 7 years or the photon index has steepened by 0.10 (with no soft excess present) while the continuum flux in the range 2-10 keV has varied only minimally (10%). This result could support recent claims that the soft excess is independent of the X-ray continuum.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - galaxies: individual: Mkn 590 - X-rays: galaxies
Simbad objects:
7
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