Ian N. Evans, Janet D. Evans, J. Rafael Martínez-Galarza, Joseph B. Miller, Francis A. Primini, Mojegan Azadi, Douglas J. Burke, Francesca M. Civano, Raffaele D’Abrusco, Giuseppina Fabbiano, Dale E. Graessle, John D. Grier, John C. Houck, Jennifer Lauer, Michael L. McCollough, Michael A. Nowak, David A. Plummer, Arnold H. Rots, Aneta Siemiginowska and Michael S. Tibbetts
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引用次数: 0
摘要
钱德拉源目录(CSC)是一个虚拟的 X 射线天体物理学设施,可对钱德拉 X 射线天文台获得的高级 CCD 成像分光计和高分辨率相机-I 成像观测中探测到的大量 X 射线源样本进行详细的单个源研究和统计研究。该目录提供精心策划的、高质量的、经过统一校准和分析的位置、空间、光度、光谱和时间源属性表,以及可用于科学研究的 X 射线数据产品。后者包括多种基于源和场的 FITS 格式产品,可作为进一步研究的基础,大大简化了对有科学意义的源样本的后续分析。我们详细讨论了 CSC 第 2 版系列所使用的算法,包括 CSC 2.0 和 CSC 2.1,前者包括截至 2014 年底公开发布的观测数据中确定的 317167 个天空中的独特 X 射线源,后者则增加了截至 2021 年底发布的钱德拉数据,并将星表扩展到 407806 个源。除了增加更多最新观测数据外,CSC 2.1 版系列还包括多种算法改进,与早期版本相比有了显著提高。在大部分视场中,大多数观测的紧凑源灵敏度极限为5光子,比第1版低2倍,这是通过叠加观测和使用优化的源探测方法实现的。贝叶斯 X 射线孔径测光代码即使在拥挤的视场和低计数源也能产生稳定的通量。当前发布的 CSC 2.1 版与 Gaia-CRF3 天体测量参考框架绑定,以获得星表源的最佳天空位置。
The Chandra Source Catalog (CSC) is a virtual X-ray astrophysics facility that enables both detailed individual source studies and statistical studies of large samples of X-ray sources detected in Advanced CCD Imaging Spectrometer and High Resolution Camera-I imaging observations obtained by the Chandra X-ray Observatory. The catalog provides carefully curated, high-quality, and uniformly calibrated and analyzed tabulated positional, spatial, photometric, spectral, and temporal source properties, as well as science-ready X-ray data products. The latter includes multiple types of source- and field-based FITS format products that can be used as a basis for further research, significantly simplifying follow-up analysis of scientifically meaningful source samples. We discuss in detail the algorithms used for the CSC Release 2 Series, including CSC 2.0, which includes 317,167 unique X-ray sources on the sky identified in observations released publicly through the end of 2014, and CSC 2.1, which adds Chandra data released through the end of 2021 and expands the catalog to 407,806 sources. Besides adding more recent observations, the CSC Release 2 Series includes multiple algorithmic enhancements that provide significant improvements over earlier releases. The compact source sensitivity limit for most observations is ∼5 photons over most of the field of view, which is ∼2× fainter than Release 1, achieved by coadding observations and using an optimized source detection approach. A Bayesian X-ray aperture photometry code produces robust fluxes even in crowded fields and for low-count sources. The current release, CSC 2.1, is tied to the Gaia-CRF3 astrometric reference frame for the best sky positions for catalog sources.