Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..10g&link_type=abstract
X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held
Physics
Extra-Galactic X-Ray Binaries
Scientific paper
Based on Chandra and ASCA observations of the Milky Way, Magellanic Clouds and nearby starburst galaxies we study population of high mass X-ray binaries (HMXB), their connection with ultra-luminous X-ray sources (ULX) and relation to the star formation.
We show that the number and/or the collective X-ray luminosity of HMXBs in a galaxy can be used as an independent star formation rate (SFR) indicator. Although more subtle SFR dependent effects are likely to exist, the data in the log(LX) > 36 luminosity range are broadly consistent with existence of a universal luminosity function of HMXBs which can be roughly described as a power law with differential slope of ~ 1.6, a cutoff at log(LX[erg/s])~ 40.5 and the normalization proportional to the star formation rate. The high luminosity part of this distribution corresponds to the ULX sources found in many starburst galaxies.
Applying our results to high redshift (up to z~ 1.2) starburst galaxies observed by CHANDRA in the Hubble Deep Field North we show that the calibration of the collective luminosity of HMXBs as a SFR indicator based on the local sample agrees well with the SFR estimates obtained for these distant galaxies with conventional methods.
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