Before the official first-light images, the Chandra X-Ray Observatory obtained an X-ray image of the field to which its focal plane was first exposed. We describe this historic observation and report our study of the first Chandra field. Chandra's Advanced CCD Imaging Spectrometer (ACIS) detected 15 X-ray sources, the brightest being dubbed Leon X-1 to honor the Chandra telescope scientist Leon Van Speybroeck. Based on our analysis of the X-ray data and spectroscopy at the European Southern Observatory (ESO; La Silla, Chile), we find that Leon X-1 is a type-1 (unobscured) active galactic nucleus (AGN) at redshift z = 0.3207. Leon X-1 exhibits strong Fe II emission and a broad-line Balmer decrement that is unusually flat for an AGN. Within the context of the eigenvector-1 correlation space, these properties suggest that Leon X-1 may be a massive (≥109?M☉) black hole, accreting at a rate approaching its Eddington limit.
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机译：在正式的初次成像之前，钱德拉X射线天文台获得了其焦平面首次暴露于其上的场的X射线图像。我们描述了这一历史性观察并报告了我们对第一个钱德拉油田的研究。钱德拉的高级CCD成像光谱仪（ACIS）检测到15个X射线源，其中最亮的被称为里昂X-1，以纪念钱德拉望远镜科学家莱昂·范·斯派布罗克。根据我们对欧洲南方天文台（ESO;智利拉西拉）的X射线数据和光谱分析的结果，我们发现莱昂X-1在红移z处是1型（无遮挡）活性银河核（AGN）。 = 0.3207。 Leon X-1表现出很强的Fe II发射和宽广的Balmer减量，这对于AGN而言通常是平坦的。在本征矢量-1相关空间的背景下，这些性质表明，Leon X-1可能是一个巨大的黑洞（≥109？M☉），以接近其爱丁顿极限的速率积聚。
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