邻近恒星形成星系中大质量X射线双星与年轻星团的空间相关性
The Spatial Correlation of High Mass X-ray Binaries and Young Star Clusters in Nearby Star-Forming Galaxies
AI总结：
分析了M31和M33中HMXB与YSC的空间相关性，发现其峰值与宿主星系比恒星形成率强相关，且X射线叠加分析表明YSC内部动力学形成并非HMXB主要形成通道。
摘要：
我们分析了M31和M33中大质量X射线双星（HMXB）与年轻星团（YSC）种群的两点空间相关函数。我们发现，在这两个星系中，HMXB与YSC在空间上的相关性程度高于随机预期。结合银河系、小麦哲伦云和NGC 4449的类似研究，我们发现空间相关函数的峰值与宿主星系的比恒星形成率存在强相关性。我们还对M31中211个未在X射线波段探测到的YSC和M33中463个YSC进行了X射线叠加分析。在两个星系中，我们未在叠加星团位置探测到超出3$σ$上限（约$10^{33}$ erg s$^{-1}$，0.35-8 keV）的过量X射线发射，这强烈表明YSC内部的动力学形成并非HMXB的主要形成通道。我们在以下背景下解释了我们的结果：（1）星系近期的恒星形成史，这可能导致为HMXB供能的致密天体人口统计特征存在差异；（2）致密天体在形成期间经历的出生踢出差异，这可能会将新形成的HMXB从其诞生星团中弹出。
英文摘要：
We present an analysis of the two-point spatial correlation functions of high-mass X-ray binary (HMXB) and young star cluster (YSC) populations in M31 and M33. We find evidence that HMXBs are spatially correlated with YSCs to a higher degree than would be expected from random chance in both galaxies. When supplemented with similar studies in the Milky Way, Small Magellanic Cloud, and NGC 4449, we find that the peak value of the spatial correlation function correlates strongly with the specific star formation rate of the host galaxy. We additionally perform an X-ray stacking analysis of 211 non-X-ray detected YSCs in M31 and 463 YSCs in M33. We do not detect excess X-ray emission at the stacked cluster locations down to 3$σ$ upper limits of $\sim10^{33}$ erg s$^{-1}$ (0.35-8 keV) in both galaxies, which strongly suggests that dynamical formation within YSCs is not a major HMXB formation channel. We interpret our results in the context of (1) the recent star formation histories of the galaxies, which may produce differences in the demographics of compact objects powering the HMXBs, and (2) the differences in natal kicks experienced by compact objects during formation, which can eject newly-formed HMXB from their birth clusters.
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