A 2 Micron All Sky Survey

Kleinmann， S.G.。2微米全天空巡天（2MASS）将在三个近红外波段，J (1.25 um), H （1.65 um）和K‘ （2.17 um）获得整个天空的均匀图，具有足够的灵敏度，以10置信度探测K’14等的点源。这次巡天的深度将是目前唯一一次大规模近红外巡天的2.5万倍以上，后者是在近25年前进行的（Neugebauer和Leighton 1969），它将能够探测和精确测量近1亿颗恒星和至少30万个星系的位置和红外亮度。由于其在灵敏度和天空覆盖方面的巨大飞跃，该数据库的科学潜力目前只能想象。明显的应用是研究银河系中恒星的大规模分布和局部宇宙中星系的大规模分布。更广泛地说，该数据库将丰富在整个电磁频谱上进行的天空调查分析，并将极大地扩展新的红外阵列技术的科学潜力。p-项目的实施涉及建造两个130米望远镜，一个将在霍普金斯山建造，另一个将在塞罗·托洛洛美洲天文台建造。该调查计划于1996财年开始，预计南半球将耗时2年，北半球将耗时2-3年。这些数据将在科学小组结案后立即公开，也就是在调查行动开始后的1.5年内。最终的数据产品，包括点源目录和原始数据的扩展源数据库，也将提供给感兴趣的用户。＊＊＊

ABSTRACT 9317456 Kleinmann, S.G. The Two Micron All Sky Survey (2MASS) will obtain a uniform map of the entire sky in three near-infrared bands, J (1.25 um), H (1.65 um) and K' (2.17 um), with sufficient sensitivity to detect point sources having K'14 mag. at 10 confidence. The survey will penetrate more than 25,000 times deeper than the only existing large-scale near- infrared sky survey, which was carried out nearly 25 years ago (Neugebauer and Leighton 1969), and will enable the detection and accurate measurement of positions and infrared brightness for nearly 100 million stars and at least 300,000 galaxies. Because of its great leap in sensitivity and sky coverage, the scientific potential of this database can only be imagined at present. Obvious applications are the study of the large-scale distribution of stars in the Milky Way and the large-scale distribution of galaxies in the Local Universe. More broadly, the database will enrich analysis of sky surveys carried out over the whole electromagnetic spectrum, and will vastly expand the scientific potential of new infrared array technology. The implementation of the p-project involves the construction of two 1.3m telescopes, one to be built at Mt. Hopkins and one t be built at Cerro Tololo Interamerican Observatory. The survey is planned to begin in FY96, and is expected to take 2 years in the Southern Hemisphere and 2-3 years in the Northern Hemisphere. The data will become publicly available immediately following checkout by the science team, within 1.5 years after the start of survey operations. The final data products, including a Point Source Catalog, and Extended Source database of raw data will also be available to the interested user. ***