COSMOS2020: A Panchromatic View of the Universe to z ∼ 10 from Two Complementary Catalogs
COSMOS2020: A Panchromatic View of the Universe to z ∼ 10 from Two Complementary Catalogs
复制标题
DOI：
10.3847/1538-4365/ac3078
复制
发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
J. Weaver;O. B. Kauffmann;O. Ilbert;H. McCracken;A. Moneti;S. Toft;G. Brammer;M. Shuntov;
中科院分区：
文献类型：
--
作者：
J. Weaver;O. B. Kauffmann;O. Ilbert;H. McCracken;A. Moneti;S. Toft;G. Brammer;M. Shuntov;
宇宙演化调查（COSMOS）已经成为星系外天文学的基石。自2015年最后一次公开编目以来，在COSMOS领域收集了大量新的成像和光谱数据。本文介绍了这些新成像数据的收集、处理和分析，以产生一个新的参考光度红移目录。源检测和多波长光度测定在COSMOS场的2°2范围内对170万个源进行了检测，其中966,000个源是用所有可用的宽带数据测量的，使用传统的孔径光度测定方法和我们开发的新的轮廓拟合光度提取工具the Farmer。给出了两种光度表的详细比较。利用两个独立的光度红移代码计算每个目录中所有源的光度红移。最后，比较了光度方法和红移代码的性能，以证明在光度红移中具有特殊程度的自一致性。i < 21的光源的光度红移精度低于百分之25，即使是最微弱的25 < i < 27的光源也能达到5%的精度。最后，在COSMOS领域过去、现在和未来的调查背景下讨论了这些结果。与COSMOS2015相比，它达到了相同的光度红移精度，几乎深了一个星等。光度表及其光度红移解和物理参数将通过常用的天文档案系统（ESO第三阶段、IPAC-IRSA和CDS）提供。
The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This paper describes the collection, processing, and analysis of these new imaging data to produce a new reference photometric redshift catalog. Source detection and multiwavelength photometry are performed for 1.7 million sources across the 2 deg2 of the COSMOS field, ∼966,000 of which are measured with all available broadband data using both traditional aperture photometric methods and a new profile-fitting photometric extraction tool, The Farmer, which we have developed. A detailed comparison of the two resulting photometric catalogs is presented. Photometric redshifts are computed for all sources in each catalog utilizing two independent photometric redshift codes. Finally, a comparison is made between the performance of the photometric methodologies and of the redshift codes to demonstrate an exceptional degree of self-consistency in the resulting photometric redshifts. The i < 21 sources have subpercent photometric redshift accuracy and even the faintest sources at 25 < i < 27 reach a precision of 5%. Finally, these results are discussed in the context of previous, current, and future surveys in the COSMOS field. Compared to COSMOS2015, it reaches the same photometric redshift precision at almost one magnitude deeper. Both photometric catalogs and their photometric redshift solutions and physical parameters will be made available through the usual astronomical archive systems (ESO Phase 3, IPAC-IRSA, and CDS).