A Possible Detection of M31* with Chandra

Details A Possible Detection of M31* with Chandra A Possible Detection of M31* with Chandra

2004-12-14

arxiv.org/abs/astro-ph/0412350v1

Astrophys.J. 632 (2005) 1042-1047

Astronomy and Astrophysics

Astrophysics

14 pages, 5 figures, submitted to ApJ

Scientific paper

10.1086/432967

Two independent sets of Chandra and HST images of the nuclear region of M31 allow registration of X-ray and optical images to 0.1''. This registration shows that none of the bright (10^{37} erg/s) X-ray sources near the nucleus is coincident with the central super-massive black hole, M31*. A 50ks Chandra HRC image shows 2.5 sigma evidence for a faint (3 x 10^{35} erg/s), apparently resolved source which is consistent with the position of the M31*. The Bondi radius of M31* is 0.9'', making it one of the few super-massive black holes with a resolvable accretion flow. This large radius and the previous detections of diffuse, X-ray emitting gas in the nuclear region make M31* one of the most secure cases for a radiatively inefficient accretion flow and place some of the most severe constraints on the radiative processes in such a flow.

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