A Possible Chandra Detection of M31*

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

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.8013g&link_type=abstract

American Astronomical Society Meeting 204, #80.13; Bulletin of the American Astronomical Society, Vol. 36, p.983

Astronomy and Astrophysics

Astronomy

Scientific paper

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 ˜ 1037erg s-1 X-ray sources near the nucleus is actually coincident with the central super-massive black hole, M31*. A 50ks Chandra HRC image shows ˜ 2.5σ evidence for a faint ( ˜ 3 × 1035erg s-1) 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. This work supported by NASA contracts NAS8-03060, NAS8-39073 and grant NAG5-10889.

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