Measuring Mass and Spin of a Stellar Black Hole in M33

Details Measuring Mass and Spin of a Stellar Black Hole in M33 Measuring Mass and Spin of a Stellar Black Hole in M33

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..481m&link_type=abstract

NOAO Proposal ID #2006B-0481

Computer Science

Scientific paper

The compact X-ray source ``X-7'' in M33 is the first eclipsing black hole binary to be discovered. The proposed GMOS observations - plus the extraordinary eclipse and distance constraints that are not available for Galactic black-hole binaries - will allow us to obtain a black hole mass measurement of unprecedented precision, namely, about 5%. Further, we will use the black hole mass and the X-ray continuum data from seven deep Chandra observations to estimate the spin of X-7. Obtaining the defining properties of mass and spin for this unique black hole at 795 kpc will mark a major advance in our capability to study black holes. Future X-ray eclipse-mapping studies of X-7 can be expected to provide unique information on conditions near the event horizon of a black hole. Furthermore, X-7 would be one of only a few black holes holes to have its spin estimated, and the measurement of spin is central to models of relativistic black-hole jets, models of core-collapse SNe, and to future gravitational-wave studies of merging black holes.

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