2MASS Extended Source Catalog: Overview and Algorithms
2MASS Extended Source Catalog: Overview and Algorithms
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DOI：
10.1086/301330
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发表时间：
2000-04
期刊：
影响因子：
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通讯作者：
T. Jarrett;T. Chester;R. Cutri;S. Schneider;M. Skrutskie;J. Huchra
中科院分区：
文献类型：
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作者：
T. Jarrett;T. Chester;R. Cutri;S. Schneider;M. Skrutskie;J. Huchra
2微米全天巡天（2 MASS）将观测超过1，000，000个星系和覆盖整个天空的扩展星系源，波长在1至2微米之间。这些星系中的大多数将是新编目的物体。调查目录将具有高完整性和可靠性，低至J = 15.0 mag和KS = 13.5 mag，分别相当于1.6和2.9 mJy。小到10″的星系都能分辨，大到2.5 ″的星系都能完全成像。2 MASS将在由银河尘埃和气体的模糊效应造成的“回避区”中发现以前从未见过的星系，仅受银河系纬度非常低的恒星数量的限制，特别是朝向银河系中心。本文介绍了用于检测和表征2 MASS数据库和目录中的扩展源的基本算法。关键程序包括跟踪点扩散函数、图像背景去除、伪影去除、光度测定和基本参数化、恒星-星系鉴别以及使用决策树技术的物体分类。我们介绍并提供了2 MASS在天空中探测到的扩展源类型的例子，包括星系、银河系星云和分辨的恒星物体、多颗恒星和星团，最后是明亮恒星和瞬态事件产生的伪影。未来的论文将提供一个完整的统计分析和验证的完整性，可靠性和完整性的第一次发布的目录，以及一些基本的科学成果的目录，包括星系的颜色，数量计数和红移分布。
The Two Micron All Sky Survey (2MASS) will observe over 1,000,000 galaxies and extended Galactic sources covering the entire sky at wavelengths between 1 and 2 μm. Most of these galaxies will be newly cataloged objects. The survey catalog will have both high completeness and reliability down to J = 15.0 mag and Ks = 13.5 mag, equivalent to 1.6 and 2.9 mJy, respectively. Galaxies as small as 10″ are resolved, and those as large as ∼2.′5 are fully imaged. 2MASS will discover galaxies never seen before in the "zone of avoidance" caused by the obscuring effects of Galactic dust and gas, limited only by the extreme number of stars at very low Galactic latitude, especially toward the Galactic center. This paper describes the basic algorithms used to detect and characterize extended sources in the 2MASS database and catalog. Critical procedures include tracking the point-spread function, image background removal, artifact removal, photometry and basic parameterization, star-galaxy discrimination, and object classification using a decision tree technique. We introduce and provide examples of the types of extended sources that 2MASS detects across the sky, including galaxies, Galactic nebulae and resolved stellar objects, multiple stars and clusters, and, finally, artifacts arising from bright stars and transient events. A future paper will provide a full statistical analysis and verification of the completeness, reliability, and integrity of the first release catalog, as well as some of the basic scientific results of the catalog, including galaxy colors, number counts, and redshift distribution.