Mathematics – Probability
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.0204p&link_type=abstract
American Astronomical Society, DDA meeting #38, #2.04
Mathematics
Probability
Scientific paper
A handful of X-ray sources in the central parsec of the Galaxy appear to be accreting neutron stars and stellar-mass black holes in binary systems. This region contains roughly one million stars, ten thousand neutron stars, and a similar number of stellar black holes, making this the most concentrated population of stars and compact objects in the Galaxy. Because of the high stellar speeds (over 50 km/s) in the Galactic center, binaries with separations greater than 1 AU are easily ionized in close encounters with single stars. Nonetheless, exchange encounters do occur with a finite probability and may be capable of producing an interesting number of long-lived X-ray binaries. I will summarize the dynamical issues relevant to binaries in the Galactic center, including survival against ionization, mass segregation, and, in particular, the dynamical capture of compact objects. Special emphasis will be placed on unique status of stellar black holes in this dynamic and enigmatic region of the Galaxy, and on the rates of producing black-hole binaries.
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