Bibcode
Garcia, M. R.; Primini, F. A.; Williams, B.; Yuan, F.
Referencia bibliográfica
American Astronomical Society Meeting 204, #80.13; Bulletin of the American Astronomical Society, Vol. 36, p.983
Fecha de publicación:
5
2004
Número de citas
0
Número de citas referidas
0
Descripción
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.