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K.D. Kuntz (GSFC-LHEA/UMBC JCA), Chandra/HST M101 Collaboration
The Chandra 1 Msec exposure of M101, which will be completed in November 2004, provides the deepest X-ray image of an entire galaxy, with a limiting luminosity of 1036 ergs/s over the bulk of the disk of this face-on spiral.In the central part of the disk we expect to reach a limiting luminosity of a few times 1035 erg/s. A three-color mosaic of 16 HST ACS pointings allows us to identify optical counterparts to roughly half of the X-ray sources. We will also present the first results of the temporal behavior of the X-ray sources. The diffuse X-ray emission clearly follows the spiral arms and is well correlated with the ultraviolet emission observed with the XMM-OM. The hardness ratio of the X-ray emission does not vary significantly on kpc scales. Fits to the spectrum of the diffuse emission as observed by Chandra and XMM suggest two thermal components with temperatures of ~0.2 and ~0.6 keV. We will also discuss the spectroscopic confirmation of the identification of M101 ULX-1 with a B star counterpart.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.