Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343206g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #432.06; Bulletin of the American Astronomical Society, Vol. 41, p.299
Astronomy and Astrophysics
Astronomy
Scientific paper
Our neighbouring galaxy M31 (Andromeda), located 780 kpc away, offers a unique opportunity to study the X-ray population of a galaxy similar to the Milky Way. We have concentrated our monitoring campaign on following the X-ray activity of the stellar-mass black hole candidates, XRNe (X-Ray Novae), in the central region of M31. Observations are made approximately once a month with Chandra, following up any bright outbursts with HST in order to identify the optical counterparts. Having measurements of the X-ray and optical luminosities in outburst allows for the estimation of a system's orbital period. There are now 9 systems with a known or constrained orbital period in M31 and it is finally possible to compare their distribution with that of the Milky Way black hole systems. We show how the latest 3 orbital period estimates were obtained and compare both populations.
Galache Jose
Garcia Murillo R.
Murray Stephen S.
Steeghs Daniel
Torres Manuel A. P.
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