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2014MNRAS.437.1698M - Mon. Not. R. Astron. Soc., 437, 1698-1707 (2014/January-2)

X-ray emission from star-forming galaxies - III. Calibration of the LX-SFR relation up to redshift z ∼ 1.3.

MINEO S., GILFANOV M., LEHMER B.D., MORRISON G.E. and SUNYAEV R.

Abstract (from CDS):

We investigate the relation between total X-ray emission from star-forming galaxies and their star formation activity. Using nearby late-type galaxies and ultraluminous infrared galaxies from Paper I and star-forming galaxies from Chandra Deep Fields (CDFs), we construct a sample of 66 galaxies spanning the redshift range z ~ 0-1.3 and the star formation rate (SFR) range ∼ 0.1-103Myr- 1. In agreement with previous results, we find that the LX-SFR relation is consistent with a linear law both at z = 0 and for the z = 0.1-1.3 CDF galaxies, within the statistical accuracy of ∼ 0.1 in the slope of the LX-SFR relation. For the total sample, we find a linear scaling relation LX/SFR ~ (4.0±0.4)x1039(erg/s)/(M/yr), with a scatter of ~0.4 dex. About ∼ 2/3 of the 0.5-8keV luminosity generated per unit SFR is expected to be due to high-mass X-ray binaries. We find no statistically significant trends in the mean LX/SFR ratio with the redshift or SFR and constrain the amplitude of its variations by ≲ 0.1-0.2 dex. These properties make X-ray observations a powerful tool to measure the SFR in normal star-forming galaxies that dominate the source counts at faint fluxes.