与分辨X射线喷流源CXO J172337 .5-373442对应的光学/IR及其距离
Optical/IR counterpart to the resolved X-ray jet source CXO J172337.5-373442 and its distance
摘要：
我们目前的观测结果在光学中红外波长的X射线源CXO J172337.5-373442，这是偶然发现的钱德拉图像，并发现有一个完全解决X射线射流。这些观测包括使用地面望远镜的光学测光和光谱学以及使用斯皮策的中红外测光。我们探测到CXO J172337.5-373442的光学/红外对应物，并确定它是一颗位于334+-60秒差距的G9-V星。独立于光学/IR观测和X射线观测确定的氢柱密度的可比值表明，光源与X射线源有关。由于X射线的光度不能用一颗G9-V恒星的辐射来解释，因此CXO J172337.5-373442很可能是一颗在双星系统中的吸积致密天体。因此，CXO J 172337.5 -373442是已知距离双星系统最近的解析X射线喷流，而不是共生星。根据现有的X射线数据，无法确认致密体的性质。然而，X射线点源的低光度（7.1x10^{30} Lsun），加上对喷流年龄的估计和缺乏对明亮爆发的探测，表明X射线喷流是在物体极度静止时发射的。测得的低X射线亮度的喷流表明，这种喷流可能比我们目前的理解更普遍。
英文摘要：
We present results of observations in the optical to mid-infrared wavelengths of the X-ray source CXO J172337.5-373442, which was serendipitously discovered in the Chandra images and was found to have a fully resolved X-ray jet. The observations include a combination of photometry and spectroscopy in the optical using ground-based telescopes and mid-infrared photometry using Spitzer. We detect the optical/IR counterpart of CXO J172337.5-373442 and identify it to be a G9-V star located at a distance of 334+-60~pc. Comparable values of the hydrogen column densities determined independently from the optical/IR observations and X-ray observations indicate that the optical source is associated with the X-ray source. Since the X-ray luminosity can not be explained in terms of emission from a single G9-V star, it is likely that CXO J172337.5-373442 is an accreting compact object in a binary system. Thus, CXO J172337.5-373442 is the nearest known resolved X-ray jet from a binary system, which is not a symbiotic star. Based on the existing X-ray data, the nature of the compact object can not be confirmed. However the low luminosity of the X-ray point source, 7.1x10^{30} Lsun combined with estimates of the age of the jet and a lack of detection of bright outburst, suggests that the X-ray jet was launched during extreme quiescence of the object. The measured low X-ray luminosity of the jet suggests the likelihood of such jets being more ubiquitous than our current understanding.
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