Black Hole X-ray Novae in M31

Details Black Hole X-ray Novae in M31 Black Hole X-ray Novae in M31

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2061g&link_type=abstract

Chandra Proposal ID #07620654

Physics

Chandra Proposal Id #07620654

Scientific paper

We have been carrying out a Chandra/HST program to find Black Hole X-ray Nova (BHXN) and their optical counterparts in M31 for several years. To date we have found >2 dozen BHXN and 3 HST optical counterparts. Our results suggest a high ratio of BH to neutron star (NS) binaries, or a high duty cycle for the BHXN. We propose to continue this program, with the goal of determining the orbital period distribution and duty cycles of these BHXN. Our proposed observations will double the number of periods, yielding sufficient numbers to approximate the orbital period distribution. The orbital period distribution is the fundamental observable parameter any binary stellar evolution model much match. M31 is the only galaxy in which this extra-galactic study of BHXN is feasible.

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