M31* - The Nearest Extra-galactic SuperMassive Black Hole

Details M31* - The Nearest Extra-galactic SuperMassive Black Hole M31* - The Nearest Extra-galactic SuperMassive Black Hole

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1820g&link_type=abstract

Chandra Proposal ID #06620314

Physics

Chandra Proposal Id #06620314

Scientific paper

We propose a long look at the nearest extra-galactic SMBH in order to determine it's X-ray luminosity and variability characteristics. A previous 50ks image with the HRC provides evidence that M31* is detected, and this longer look can confirm this detection. While M31* is 100x further away than Sgr~A*, the fact that it is 10x more massive and imbedded in diffuse gas somewhat cooler renders it's (angular) Bondi radius only slightly smaller than that of Sgr~A*. Because Chandra can resolve this Bondi radius and because it is the closest extra-galactic SMBH, M31* is one of the best sources to place constraints on radially inefficient accretion flows. Until Gen-X in the 2020+ timeframe, HRC observations of M31* will provide the most detailed images of a quiescent extra-galactic SMBH.

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