Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey
Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey
复制标题
钱德拉天鹅座 OB2 遗产巡天中检测到的 X 射线源的光学和红外对应物
DOI：
10.3847/1538-4365/acdd64
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
D. García
中科院分区：
文献类型：
--
作者：
M. Guarcello;J. J. Drake;N. Wright;Tim Naylor;E. Flaccomio;V. Kashyap;D. García
年轻的大质量 OB 星团天鹅座 OB2 位于天鹅座 X 复合体中，是距离太阳最近（约 1400 颗）的恒星形成区域，拥有数千颗年轻的低质量恒星和多达 1000 颗 OB 恒星，其中包括一些我们银河系中已知的最大质量的恒星。该区域对于现代天体物理学的多个领域具有重要意义，例如研究大质量和年轻低质量恒星的物理特性以及大质量恒星对恒星和行星形成过程提供的反馈。作为 1.08 Ms Chandra Cygnus OB2 遗产项目的一部分，Cyg OB2 最近被 Chandra/ACIS-I 观测到。此次勘测在以 Cyg OB2 为中心的平方度区域内检测到了 7924 个 X 射线源。由于对观测到的 X 射线源进行正确的分类和研究还需要对其光学和红外对应物进行分析，因此我们将该区域可用的大量深入的光学和红外目录与我们新的 X 射线目录相结合。在本文中，我们描述了匹配过程并呈现了包含 5703 个源的组合目录。我们还利用 X 射线源在颜色-幅度和颜色-颜色图中的位置，简要讨论了 X 射线源与光学和红外对应物的性质。
The young massive OB association Cygnus OB2, in the Cygnus X complex, is the closest (∼1400 pc) star-forming region to the Sun hosting thousands of young low-mass stars and up to 1000 OB stars, among which are some of the most massive stars known in our Galaxy. This region holds great importance for several fields of modern astrophysics, such as the study of the physical properties of massive and young low-mass stars and the feedback provided by massive stars on star and planet formation processes. Cyg OB2 has been recently observed with Chandra/ACIS-I as part of the 1.08 Ms Chandra Cygnus OB2 Legacy Project. This survey detected 7924 X-ray sources in a square degree area centered on Cyg OB2. Since a proper classification and study of the observed X-ray sources also requires the analysis of their optical and infrared counterparts, we combined a large and deep set of optical and infrared catalogs available for this region with our new X-ray catalog. In this paper we describe the matching procedure and present the combined catalog containing 5703 sources. We also briefly discuss the nature of the X-ray sources with optical and infrared counterparts using their position in the color–magnitude and color–color diagrams.