论文标题
不合时宜：一个全天的，时域不明智的目录
unTimely: a Full-sky, Time-Domain unWISE Catalog
论文作者
论文摘要
我们介绍了不合时宜的目录，这是基于广阔的红外调查探险家（WISE）的深度时间域目录，以及跨越2010年至2020年期间的Neowise观察结果。检测是从“时间分辨的不明智的coadds”中提取的，它们堆叠在一起，每半年的智慧成像的天空段落，以创建一组〜16个全套地图（每个频段），每个地图（每个频段）都比单个明智的暴露更深，更干净。不合时宜地融合了W1（3.4微米）和W2（4.6微米）通道，这意味着我们的数据集有效地由〜32个全套不智的目录组成。我们独立于每个时尚coadd上运行众包拥挤的点源光度计流量（Schlafly等人，2018），其检测阈值低：s/n = 4.0（2.5）W1（W2）。我们总共在W1（W2）公开列出并公开发布235亿（199亿）的检测。不合时宜地比金道路附近的明智/新型单一曝光源表更深〜1.3杂志，进一步增强了朝着更高的黄道纬度的深度。不合时宜的目录主要是为了在银河系厚的磁盘或光环中以y矮人和/或晚期（t/y）的细分进行新颖的搜索，例如y矮人和/或晚型（t/y）细分。不合时宜地还将促进其他时间域科学应用，例如在长达十年的时间基线中对中红外波长的准变异性研究。
We present the unTimely Catalog, a deep time-domain catalog of detections based on Wide-field Infrared Survey Explorer (WISE) and NEOWISE observations spanning the 2010 through 2020 time period. Detections are extracted from 'time-resolved unWISE coadds', which stack together each biannual sky pass of WISE imaging to create a set of ~16 all-sky maps (per band), each much deeper and cleaner than individual WISE exposures. unTimely incorporates the W1 (3.4 micron) and W2 (4.6 micron) channels, meaning that our data set effectively consists of ~32 full-sky unWISE catalogs. We run the crowdsource crowded-field point source photometry pipeline (Schlafly et al. 2018) on each epochal coadd independently, with low detection thresholds: S/N = 4.0 (2.5) in W1 (W2). In total, we tabulate and publicly release 23.5 billion (19.9 billion) detections at W1 (W2). unTimely is ~1.3 mag deeper than the WISE/NEOWISE Single Exposure Source Tables near the ecliptic, with further enhanced depth toward higher ecliptic latitudes. The unTimely Catalog is primarily designed to enable novel searches for faint, fast-moving objects, such as Y dwarfs and/or late-type (T/Y) subdwarfs in the Milky Way's thick disk or halo. unTimely will also facilitate other time-domain science applications, such as all-sky studies of quasar variability at mid-infrared wavelengths over a decade-long time baseline.
