论文标题
连接高质量X射线二进制的金属性依赖性和红移演变
Connecting the metallicity dependence and redshift evolution of high-mass X-ray binaries
论文作者
论文摘要
银河系中高质量X射线二进制文件（HMXB）的集成X射线光度（$ L _ {\ Mathrm {X}} $）与其星形形成率（SFR）相关，并且此相关的归一化与红移相关。人口综合模型表明，$ l _ {\ mathrm {x}} $/sfr的红移演变是由HMXBS的金属性（$ z $）驱动的，并且最近使用$ z \ sim2 $的星系提供了该连接的第一个直接证据。为了通过更强大的测量确认此结果，并更好地限制了$ l _ {\ mathrm {x}} $ - sfr- $ z $关系，我们已经研究了$ l _ {\ mathrm {x}} $/sfr的$ z $依赖性。使用$ z = 0.1-0.9 $的星形星系样品，带有来自HCOSMOS和ZCOSMOS调查的光谱的样品，我们堆叠了Cosmos Legacy调查的\ Textit {Chandra}数据，以测量平均$ l _ {\ Mathrm {x x} $ z $ z $ z $ z $ z $ z $ z $ s $ $ z = 0.1-0.25 $，$ 0.25-0.4 $和$ 0.5-0.9 $。我们发现$ l _ {\ mathrm {x}} $ - sfr- $ z $与redshift的关系没有显着变化。我们的结果提供了进一步的证据，表明HMXBS的$ Z $依赖性负责$ L _ {\ Mathrm {X}} $/SFR的红移演变。将所有可用的$ z> 0 $测量结合在一起，我们得出了最合适的$ l _ {\ mathrm {x}} $ - sfr- $ z $关系，并评估不同的总体合成模型如何描述数据。这些结果在$ l _ {\ mathrm {x}} $ - sfr- $ z $关系范围内提供了迄今为止最强的约束，$ 8.0 <$ 12+$ 12+log（o/h）$ <9.0 $。
The integrated X-ray luminosity ($L_{\mathrm{X}}$) of high-mass X-ray binaries (HMXBs) in a galaxy is correlated with its star formation rate (SFR), and the normalization of this correlation increases with redshift. Population synthesis models suggest that the redshift evolution of $L_{\mathrm{X}}$/SFR is driven by the metallicity ($Z$) dependence of HMXBs, and the first direct evidence of this connection was recently presented using galaxies at $z\sim2$. To confirm this result with more robust measurements and better constrain the $L_{\mathrm{X}}$-SFR-$Z$ relation, we have studied the $Z$ dependence of $L_{\mathrm{X}}$/SFR at lower redshifts. Using samples of star-forming galaxies at $z=0.1-0.9$ with optical spectra from the hCOSMOS and zCOSMOS surveys, we stacked \textit{Chandra} data from the COSMOS Legacy survey to measure the average $L_{\mathrm{X}}$/SFR as a function of $Z$ in three redshift ranges: $z=0.1-0.25$, $0.25-0.4$, and $0.5-0.9$. We find no significant variation of the $L_{\mathrm{X}}$-SFR-$Z$ relation with redshift. Our results provide further evidence that the $Z$ dependence of HMXBs is responsible for the redshift evolution of $L_{\mathrm{X}}$/SFR. Combining all available $z>0$ measurements together, we derive a best-fitting $L_{\mathrm{X}}$-SFR-$Z$ relation and assess how different population synthesis models describe the data. These results provide the strongest constraints to date on the $L_{\mathrm{X}}$-SFR-$Z$ relation in the range of $8.0<$12+log(O/H)$<9.0$.
