The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
复制标题
DOI：
10.3847/1538-4365/aafbea
复制
发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
E. Schlafly;A. Meisner;G. Green
中科院分区：
文献类型：
--
作者：
E. Schlafly;A. Meisner;G. Green
我们提出了unWISE目录，包含了宽视场红外巡天探测器（WISE）在整个天空中观测到的大约20亿个天体的位置和通量。与现有的WISE目录（AllWISE）相比，unWISE目录有两个优势：第一，它基于显着更深的成像，第二，它改进了拥挤区域的建模。unWISE目录中使用的更深成像来自所有公开可用的3-5 μm WISE成像的共同添加，包括来自正在进行的NEOWISE重新激活使命的成像，从而将总曝光时间相对于AllWISE增加了5倍。在这些深度，即使在银河系的高纬度地区，许多光源与它们的邻居混合在一起;因此，unWISE分析同时适合数千个光源，以获得准确的测光。我们的新星表检测到的源比AllWISE星表在5σ处暗约0.7等，并且更准确地模拟了银河平面中数百万个暗淡的源，从而实现了丰富的银河系和河外科学。特别是，相对于AllWISE，unWISE探测到的星系数量在红移0和1之间增加了一倍，在红移1和2之间增加了两倍，在整个天空中编目了超过5亿个星系。
We present the unWISE Catalog, containing the positions and fluxes of roughly 2 billion objects observed by the Wide-field Infrared Survey Explorer (WISE) over the full sky. The unWISE Catalog has two advantages over the existing WISE catalog (AllWISE): first, it is based on significantly deeper imaging, and second, it features improved modeling of crowded regions. The deeper imaging used in the unWISE Catalog comes from the coaddition of all publicly available 3–5 μm WISE imaging, including that from the ongoing NEOWISE-reactivation mission, thereby increasing the total exposure time by a factor of 5 relative to AllWISE. At these depths, even at high Galactic latitudes, many sources are blended with their neighbors; accordingly, the unWISE analysis simultaneously fits thousands of sources to obtain accurate photometry. Our new catalog detects sources roughly 0.7 magnitudes fainter than the AllWISE catalog at 5σ, and more accurately models millions of faint sources in the Galactic plane, enabling a wealth of Galactic and extragalactic science. In particular, relative to AllWISE, unWISE doubles the number of galaxies detected between redshifts 0 and 1 and triples the number between redshifts 1 and 2, cataloging more than half a billion galaxies over the whole sky.