The CatWISE2020 Catalog

The CatWISE2020 Catalog consists of 1,890,715,640 sources over the entire sky selected from WISE and NEOWISE survey data at 3.4 and 4.6 μm (W1 and W2) collected from 2010 Jan. 7 to 2018 Dec. 13. This dataset adds two years to that used for the CatWISE Preliminary Catalog (Eisenhardt et al. 2020), bringing the total to six times as many exposures spanning over sixteen times as large a time baseline as the AllWISE catalog. The other major change from the CatWISE Preliminary Catalog is that the detection list for the CatWISE2020 Catalog was generated using crowdsource (Schlafly et al. 2019), while the CatWISE Preliminary Catalog used the detection software used for AllWISE. These two factors result in roughly twice as many sources in the CatWISE2020 Catalog. The scatter with respect to Spitzer photometry at faint magnitudes in the COSMOS field, which is out of the Galactic plane and at low ecliptic latitude (corresponding to lower WISE coverage depth) is similar to that for the CatWISE Preliminary Catalog. The 90% completeness depth for the CatWISE2020 Catalog is at W1=17.7mag and W2=17.5mag, 1.7mag deeper than in the CatWISE Preliminary Catalog. From comparison to Gaia, CatWISE2020 motions are accurate at the 20 mas yr−1 level for W1∼15 mag sources, and at the ∼ 100masyr−1 level for W1∼17mag sources. This level of precision represents a 12× improvement over AllWISE. The CatWISE catalogs are available in the WISE/NEOWISE Enhanced and Contributed Products area of the NASA/IPAC Infrared Science Archive.

CatWISE2020星表（CatWISE2020 Catalog）共包含全天区1,890,715,640个天体源，其数据源自2010年1月7日至2018年12月13日期间采集的WISE与NEOWISE巡天在3.4μm与4.6μm（即W1与W2波段）的观测数据。相较于基于2020年Eisenhardt等人研究的CatWISE初步星表（CatWISE Preliminary Catalog），本数据集新增了两年的观测数据，使得总曝光次数达到原初的6倍，时间基线跨度则是AllWISE星表（AllWISE Catalog）的16倍以上。与CatWISE初步星表的另一项核心改进在于，CatWISE2020星表的天体源探测列表采用众包探测（crowdsource）方法生成（基于Schlafly等人2019年的研究），而CatWISE初步星表则沿用了AllWISE星表所使用的探测软件。上述两项改进使得CatWISE2020星表中的天体源数量约为CatWISE初步星表的两倍。在银道面外、黄道纬度较低（对应WISE覆盖深度较低）的COSMOS天区中，CatWISE2020星表在暗星等下与斯皮策（Spitzer）测光结果的弥散程度与CatWISE初步星表相当。CatWISE2020星表的90%完备性极限星等分别为W1=17.7星等、W2=17.5星等，较CatWISE初步星表深1.7星等。通过与盖亚（Gaia）星表的比对可知，对于W1星等约为15的天体源，CatWISE2020的自行精度可达20 mas yr⁻¹量级；对于W1星等约为17的天体源，自行精度则约为100 mas yr⁻¹。该精度水平较AllWISE星表提升了12倍。CatWISE系列星表可在NASA/IPAC红外科学档案（NASA/IPAC Infrared Science Archive）的WISE/NEOWISE增强与贡献产品板块获取。