Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..oss.b5003d&link_type=abstract
American Physical Society, Ohio Section Spring 2004, April 16-17, 2004, Ohio University, Athens, Ohio, MEETING ID: OSS04, abstra
Physics
Scientific paper
The sub-arcsecond spatial resolution of Chandra recently revealed that early-type galaxies comprise a significant number of low-mass X-ray binaries (LMXBs). Early studies suggest the existence of a 'knee' in their X-ray luminosity function near the Eddington luminosity of a 1.4 Mo neutron star, indicating a transition from neutron star to black hole binaries. Recent analyses show however that a thorough correction for incompleteness is crucial, and able to remove the need for this break luminosity, leaving single power law fits more suitable for the data. We present luminosity functions of 65 elliptical galaxies in the Chandra archive which represents the largest uniformly reduced sample so far. An iterative Bayesian algorithm takes incompleteness and local background variation into account and generates the unbiased luminosity functions. This new non-parametric approach uncovers the significance of the contribution of unresolved LMXBs to the diffuse emission and the degree to which a break luminosity is required.
Diehl Steven
Statler Thomas
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