Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprx11010w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
ASCA and Chandra observations of elliptical galaxies indicate that most low mass X-ray binaries (LMXBs) are formed in globular clusters, rather than in the stellar fields of galaxies. Analysis of ASCA observations shows that the X-ray luminosity of the hard LMXB component in ellipticals is directly proportional to the number of globular clusters they contain. Chandra observations allow individual LMXBs to be resolved out and correlated with the positions of globular clusters. In several ellipticals, at least half their LMXBs reside in globular clusters. In particular, our Chandra observation of NGC 1407 indicates that 55% of the LMXBs detected are associated with globular clusters. About 90% of the 160 detected LMXBs in NGC 1407 have X-ray luminosities which exceed the Eddington luminosity for neutron stars. Thus, most are likely to be black hole binaries, rather than multiple neutron star binaries within individual globulars, since 45% do not reside in globulars.
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