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首页> 外文期刊>The Astrophysical journal >AN ULTRAVIOLET-EXCESS OPTICAL CANDIDATE FOR THE LUMINOUS GLOBULAR CLUSTER X-RAY SOURCE IN NGC 1851
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AN ULTRAVIOLET-EXCESS OPTICAL CANDIDATE FOR THE LUMINOUS GLOBULAR CLUSTER X-RAY SOURCE IN NGC 1851

机译：NGC 1851中发光球团X射线源的超紫外光学候选离子

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摘要

The intense, bursting X-ray source in the globular cluster NGC 1851 was one of the first cluster sources discovered, but has remained optically unidentified for 25 years. We report here on results from Hubble Space Telescope WFPC2 multicolor images in NGC 1851. Our high spatial resolution images resolve ～200 objects in the 3″ radius Einstein X-ray error circle, 40 times as many as in previous ground-based work. A color-magnitude diagram of the cluster clearly reveals a markedly UV-excess object with B ～ 21, (U - B) ～ -0.9, only 2″ from the X-ray position. The UV-excess candidate is 0.12″ distant from a second, unremarkable star that is 0.5 mag brighter in B; thus ground-based studies of this field are probably impractical. Three other UV-excess objects are also present among the ～16,000 objects in the surveyed region of the cluster, leaving a ～5% probability that a UV-excess object has fallen in the X-ray error circle by chance. No variability of the candidate is seen in these data, although a more complete study is required. If this object is in fact the counterpart of the X-ray source, previous inferences that some globular cluster X-ray sources are optically subluminous with respect to low-mass X-ray binaries in the field are now strengthened.
机译：NGC 1851球状星团中强烈的爆发性X射线源是最早发现的星团源之一，但25年来一直在光学上无法识别。我们在此报告NGC 1851中哈勃太空望远镜WFPC2多色图像的结果。我们的高空间分辨率图像可分辨3英寸半径的爱因斯坦X射线误差圈中的约200个物体，是以前的地面工作的40倍。团簇的色度图清楚地显示出一个明显的紫外线过量的物体，其B射线位置为B〜21，（U-B）〜-0.9，距X射线位置仅2英寸。紫外线过量的候选者与第二颗不引人注目的恒星相距0.12英寸，该恒星的B亮度高0.5 mag。因此，该领域的地面研究可能不切实际。在群集的被调查区域的约16,000个对象中，还存在其他三个紫外线过多的对象，使紫外线过量的对象偶然掉入X射线误差圈的概率为5％。尽管需要更全面的研究，但在这些数据中没有发现候选者的变异性。如果这个物体实际上是X射线源的对应物，那么现在就可以增强一些以前的推断，即某些球状簇X射线源相对于该领域中的低质量X射线二进制在光学上是亚发光的。

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