Iron emission line from the spiral galaxy M101
Abstract
Archival Suzaku data of the face-on spiral galaxy M101 were analyzed. An intense emission line at 6.72+0.10-0.12 keV was detected in the central region. This line is identified with a K-line from He-like iron, which indicates the existence of a thin thermal plasma with a temperature of several keV. The iron line luminosity within the central 5 arcmin radius region is estimated to be (2-12)x1037 erg s-1. The origin of the iron emission line is discussed.
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