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Date and Time of the Query: 2019-04-19 T17:38:04 PDT
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For refcode 2008ApJ...682.1020K:
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2008ApJ...682.1020K X-Ray Sources in the Star-Forming Galaxies NGC 4194 and NGC 7541 Kaaret, Philip; Alonso-Herrero, Almudena Abstract. We examine the X-ray point-source population and 2-10 keV luminosity for two galaxies with high star formation rates (SFRs), NGC 4194 and NGC 7541. The X-ray point-source luminosity function (XLF) for these two galaxies is consistent with the XLF found by Grimm et al. for a sample of star-forming galaxies. Combining our results with a sample of galaxies with SFRs above 1 M_sun_ yr^-1^, we find that the number of X-ray point sources above a luminosity of 2x10^38^ ergs s^-1^ is N=(1.8+/-0.4)SFR/(M_sun_ yr^-1^). This number is lower than previously inferred by Grimm et al. based on a sample of galaxies with lower SFRs. We find that the ratio of X-ray luminosity in the 2-10 keV band to SFR is L_X_/(10^40^ ergs s^-1^)=(0.37+/-0.08) SFR/(M_sun_ yr^-1^). This value may serve as a calibration in attempts to use X-ray luminosity to measure the SFR of galaxies at cosmological distances. The ratio of mass accreted onto compact objects versus mass used to form stars is near 10^ -6^. This ratio may be useful in constraining population synthesis models of X-ray binary formation in actively star-forming systems. Key words: Black Hole Physics, Galaxies: Individual: NGC Number: NGC 1073, galaxies: individual (NGC 7541), Galaxies: Stellar Content, X-Rays: Galaxies
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