Details

Autor(en) / Beteiligte

• RIVERS, Elizabeth
• MARKOWITZ, Alex
• DURO, Refiz
• ROTHSCHILD, Richard

Titel

A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS

Ist Teil von

• The Astrophysical journal, 2012-11, Vol.759 (1), p.1-6

Ort / Verlag

Bristol: IOP

Erscheinungsjahr

2012

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 K[alpha] emission line was detected with an equivalent width of ~120 + or - 25 eV and an Fe K[beta] line was identified with an equivalent width of ~30 + or - 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.