A Comparative Study of the Nearest Two SMBH, M31* and Sgr A*

Details A Comparative Study of the Nearest Two SMBH, M31* and Sgr A* A Comparative Study of the Nearest Two SMBH, M31* and Sgr A*

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1107g&link_type=abstract

American Astronomical Society, HEAD meeting #11, #11.07; Bulletin of the American Astronomical Society, Vol. 41, p.672

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Scientific paper

We confirm our earlier tentative detection of M31* in X-rays and measure its light-curve and spectrum. Observations in 2004-2005 find M31* rather quiescent in the X-ray and radio. However, X-ray observations in 2006-2007 show M31* to be highly variable at times. A separate variable X-ray source is found near P1, the brighter of the two optical nuclei. The apparent angular Bondi radius of M31* is the largest of any black hole, and large enough to be well resolved with Chandra. The diffuse emission within this Bondi radius is found to have an X-ray temperature 0.3 keV and density 0.1 cm-3, indistinguishable from the hot gas in the surrounding regions of the bulge given the statistics allowed by the current observations. The X-ray source at the location of M31* is consistent with a point source and a power law spectrum with energy slope 0.9±0.2. Our identification of this X-ray source with M31* is based solely on positional coincidence.

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