论文标题
调查NGC 628中X射线二进制文件与紧凑型星簇之间的连接
Investigation of the Connection Between X-ray Binaries and Compact Star Clusters in NGC 628
论文作者
论文摘要
我们研究了附近Galaxy NGC 628中的X射线二进制文件（XRB）类型（XRB）的类型与紧凑型星团的性质之间的可能联系。在观察视野中，使用{\ it chandra}档案数据涵盖了2001- 2018年，涵盖2001-2018年份，75 X射线源。共有69个XRB，其中之一是超X射线源（ULX），在3 $ \ times10^{36} \ leq l_ {x} $ \ leq $ \ leq $ \ leq $ \ times10^$ \ times10^{39} $ erg S $^{-1} $中的光度范围为3 $ \ times10^{36} \ leq l_ {x} $ \ leq $ \ leq $ \ leq $ \ times10^{39} $。我们通过改进的星体测量法确定了与{\ it HST}视场相吻合的42 XRB的光学对应物。我们根据光学对应物的存在将其中的15个归类为HMXB。没有光学对应物的其余源被归类为LMXB。我们还使用{\ it HST}档案中绘制的多波段光学图像在此星系中搜索紧凑型星团。确定了864个紧凑型星团，并通过将最佳拟合SSP（简单恒星种群）模型应用于其颜色颜色图来确定其年龄和质量。我们发现，在NGC 628中，HMXB与年轻的星形群和LMXBS与较旧的群集相关。我们的发现支持不同类型的XRB和群集年龄之间的联系，该年龄已经为其他星系存在。
We investigated for a possible connection between the types of X-ray binaries (XRBs) and the properties of compact star clusters in the nearby galaxy NGC 628. Using {\it Chandra} archival data covering the years 2001-2018, 75 X-ray sources were detected within the field of view of observations. A total of 69 XRBs, one of which is an ultraluminous X-ray source (ULX), were found to be in the luminosity range of 3$\times10^{36}\leq L_{X}$ $\leq $ 2$\times10^{39}$ erg s$^{-1}$. We identified the optical counterpart(s) of 15 of the 42 XRBs that coincide with the {\it HST} field of view via improved astrometry. We classified 15 of them as HMXBs based on the presence of the optical counterparts. The remaining sources with no optical counterparts were classified as LMXBs. We also search compact star clusters in this galaxy using the multi-band optical images drawn from {\it HST} archives. 864 compact star clusters were identified and their ages and masses were determined by applying the best-fit SSP (Simple Stellar Population) model to their color-color diagram. We found that in NGC 628, HMXBs are associated with younger star clusters and LMXBs with older ones. Our findings support a connection between different types of XRBs and cluster ages, already known to exist for other galaxies.
