论文标题
NGC 4472中的球形群集超X射线源的光学和X射线随访
Optical and X-ray Follow-Up to a Globular Cluster Ultraluminous X-ray Source in NGC 4472
论文作者
论文摘要
NGC 4472是由球形簇托管的五个超X射线源的所在地。这些来源已被认为是外层状球状簇中的好黑洞候选者$ - $ $ $ $ a的人口，可能会提供有关合并黑洞二进制文件的祖细胞的观察信息。在这项工作中，我们提出了X射线和光学后续，其中包括其中一种CXOUJ1229410+075744（GCU1）。我们没有发现GCU1中[OIII]光发射的证据，这表明缺乏超级 - 埃德丁顿流出的大量证据，这与外层状GC中的少数ULX相比所见。 2019 - 2021年的X射线监视显示，未检测到的X射线排放在几美元$ \ times $ 10^{38} $ erg/s。多波长的比较与圆盘主导的，在爱丁顿银河黑洞相近低质量X射线二进制（GRS 1915+105+105和XTEJ1817-330）的比较表明，GCU1可能显示出与GRS 1915+105在x射线差异和类似关系的$ l _x $ $ kt $ kt $ kt $ kt $ kt $ kt $ kt $ kt $ kt的行为相似的行为幅度高。
NGC 4472 is home to five ultraluminous X-ray sources hosted by globular clusters. These sources have been suggested as good black hole candidates in extragalactic globular clusters$-$ a highly sought after population that may provide observational information regarding the progenitors of merging black hole binaries. In this body of work, we present X-ray and optical follow up to one of these sources, CXOUJ1229410+075744 (GCU1). We find no evidence of [OIII] optical emission in GCU1 which indicates a lack of significant evidence for super-Eddington outflows, unlike what is seen in a handful of ULXs in extragalactic GCs. X-ray monitoring from 2019-2021 shows no detected X-ray emission above a few $\times$ $10^{38}$ erg/s. Comparisons of the multi-wavelength properties to disc-dominated, near Eddington Galactic black hole low mass X-ray binaries (GRS 1915+105 and XTEJ1817-330) suggests that GCU1 may show similar behaviour to GRS 1915+105 in terms of X-ray variability and similar relationships between $L_X$ and $kT$, with GCU1 showing maximum X-ray luminosities one order of magnitude higher.
