Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4922k&link_type=abstract
American Astronomical Society Meeting 208, #49.22; Bulletin of the American Astronomical Society, Vol. 38, p.128
Other
1
Scientific paper
I present an analysis of the diffuse X-ray emission from the disk of M101 as observed by Chandra and XMM-Newton. The X-ray emission tracks the GALEX FUV emission, thus implying that the X-ray emission is dominated by star-formation. At Chandra/XMM resolution, the diffuse spectrum is dominated by O VII, O VIII, and the Fe-L complex. A 0.75-1.0 keV/0.4-0.75 keV hardness ratio map shows that, with the exception of two giant H II regions, the hardness ratio does not vary significantly across the disk, meaning that a spectrum extracted from the entire disk is, in fact, representative of the spectrum of most smaller regions. The diffuse spectrum is well fit by two thermal components with kT=(0.18,0.65) keV. These temperatures are representative of a number of other late type spiral disks observed by Chandra and XMM-Newton,and are similar to those seen in Galactic star-forming regions. It is not currently clear whether the uniformity is real, or due to the relatively low spectral resolution; simulations suggest that a number of different distributions of emission measure, when observed at this resolution, would produce the fitted values.
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