恒星形成星系的X射线辐射- III。红移z $\simeq$ 1.3的Lx-SFR关系的标定
X-ray emission from star-forming galaxies - III. Calibration of the Lx-SFR relation up to redshift z$\simeq$1.3
摘要：
研究了恒星形成星系的X射线总辐射与恒星形成活动的关系。我们利用论文I中的晚型星系和超红外星系以及钱德拉深场的恒星形成星系，构造了一个66个星系的样本，其红移范围为z~0-1.3，恒星形成率（SFR）范围为~0.1-10^3 M_sun/yr。与以前的结果一致，我们发现Lx-SFR关系在z=0和z=0.1-1.3的CDF星系中都符合线性规律，在Lx-SFR关系的斜率的统计精度为~0.1的范围内。对于总样本，我们发现线性标度关系Lx/SFR~（4.0 \pm 0.4）× 10 ^{39}（erg/s）/（Msun/yr），离散度为~0.4 dex。每单位SFR产生的0.5-8 keV光度中约有2/3是由HMXB产生的。我们发现，平均Lx/SFR比率与红移或恒星形成率之间没有统计学显著的趋势，并且将其变化幅度限制在<0.1-0.2 dex。这些特性使得X射线观测成为测量正常恒星形成星系中恒星形成率的有力工具，这些星系在微弱通量下占主导地位。
英文摘要：
We investigate the relation between total X-ray emission from star-forming galaxies and their star formation activity. Using nearby late-type galaxies and ULIRGs from Paper I and star-forming galaxies from Chandra Deep Fields, we construct a sample of 66 galaxies spanning the redshift range z~0-1.3 and the star-formation rate (SFR) range ~0.1-10^3 M_sun/yr. 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\pm 0.4)x10^{39}(erg/s)/(Msun/yr), with a scatter of ~0.4 dex. About ~2/3 of the 0.5-8 keV luminosity generated per unit SFR is expected to be due to HMXBs. We find no statistically significant trends in the mean Lx/SFR ratio with the redshift or star formation rate 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 star formation rate in normal star-forming galaxies that dominate the source counts at faint fluxes.
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