The spatial correlation of high-mass X-ray binaries and young star clusters in nearby star-forming galaxies
The spatial correlation of high-mass X-ray binaries and young star clusters in nearby star-forming galaxies
复制标题
高质量X射线双星与附近恒星形成星系中年轻星团的空间相关性
DOI：
10.1093/mnras/stad1368
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Williams, Benjamin F.
中科院分区：
文献类型：
--
作者：
Binder, Breanna A.;Anderson, Ashley K.;Garofali, Kristen;Lazzarini, Margaret;Williams, Benjamin F.
我们对 M31 和 M33 中的高质量 X 射线双星 (HMXB) 和年轻星团 (YSC) 星团的两点空间相关函数进行了分析。我们发现证据表明，HMXB 与 YSC 的空间相关程度高于两个星系中随机机会的预期程度。当补充银河系、小麦哲伦云和NGC 4449中的类似研究时，我们发现空间相关函数的峰值与宿主星系的特定恒星形成率密切相关。我们还对 M31 中的 211 个非 X 射线检测到的 YSC 和 M33 中的 463 个 YSC 进行了 X 射线叠加分析。我们没有在两个星系中的堆叠星团位置检测到低至∼1033erg s−1(0.35–8 keV) 3σ上限的过量X射线发射，这强烈表明YSC内的动态形成不是主要的HMXB形成通道。我们在以下背景下解释我们的结果：（1）星系最近的恒星形成历史，这可能会产生为 HMXB 提供动力的致密天体的人口统计差异，以及（2）致密天体在形成过程中经历的出生踢的差异，这可能会将新形成的 HMXB 从其诞生星团中弹出。
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 3σ upper limits of ∼1033erg 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 HMXBs from their birth clusters.