Black Hole X-ray Nova in M31

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Chandra Proposal Id #07620052

Scientific paper

During A02-6 we found more than a dozen Black Hole X-ray Novae (BHXN) in M31 using Chandra, and with HST (WF/PC2 and ACS) found >6 potential optical counterparts. We propose to continue this program, with the goals of understanding the behavior of BH and neutron star (NS) X-ray nova in our nearest neighbor galaxy. With sufficient numbers of optical counterparts we will be able to determine the orbital period distribution of BHXN in M31. Uninterrupted monitoring of M31 is necessary to investigate the duty cycles and long-term lightcurves of BHXN (and other variables) in M31, and only Chandra can provide this. By continuing the program though AO10 we will amass nearly 500ks on the bulge of M31, giving the most detailed view of a nearby galaxy possible until Gen-X.

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