论文标题
最远的早期星系中的球形群集超X射线源
Globular Cluster Ultraluminous X-ray Sources in the Furthest Early-Type Galaxies
论文作者
论文摘要
球状簇中的超X射线源（ULX）是低质量X射线二进制物，通过当前不确定的积聚机制获得了高X射线亮度。使用Archival Chandra和Hubble太空望远镜观察，我们对21个最大的（$> 10^{11.5} M_ \ odot $）的21个量限制搜索（$ \ Lessim $ 70 MPC）进行了早期型星系，以识别由球形集群（GC）候选人托管的ULX。我们发现，在每个星系的有效半径的5倍之内，总共有34个ULX候选者，其中10个（$ \ sim29.4 \％$）可能由GC托管。这些新候选GC ULX的空间和光度分布与先前确定的GC ULX的比较表明它们相似：两个样品均达到$ l_x \ sim $ of $ \ sim $ of $ \ times 10^{39} $ erg/s，并且通常位于其主机的一些有效的Radii radii radii int Host Galaxies中。
Ultraluminous X-ray Sources (ULXs) in globular clusters are low mass X-ray binaries that achieve high X-ray luminosities through a currently uncertain accretion mechanism. Using archival Chandra and Hubble Space Telescope observations, we perform a volume-limited search ($\lesssim$ 70 Mpc) of 21 of the most massive ($>10^{11.5} M_\odot$) early-type galaxies to identify ULXs hosted by globular cluster (GC) candidates. We find a total of 34 ULX candidates above the expected background within 5 times the effective radius of each galaxy, with 10 of these ($\sim29.4\%$) potentially hosted by a GC. A comparison of the spatial and luminosity distributions of these new candidate GC ULXs with previously identified GC ULXs shows that they are similar: both samples peak at $L_X \sim$ a few $\times 10^{39}$ erg/s and are typically located within a few effective radii of their host galaxies.
