INVESTIGATION OF THE ERRORS IN SLOAN DIGITAL SKY SURVEY PROPER-MOTION MEASUREMENTS USING SAMPLES OF QUASARS

被引：16

作者：

Dong, Ruobing ^{[1
]}

Gunn, James ^{[1
]}

Knapp, Gillian ^{[1
]}

Rockosi, Constance ^{[2
]}

Blanton, Michael ^{[3
]}

机构：

[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[2] Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, Santa Cruz, CA 95064 USA

[3] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

来源：

ASTRONOMICAL JOURNAL | 2011年 / 142卷 / 04期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

astrometry; catalogs; proper motions; EARLY DATA RELEASE; MILKY-WAY; IMPROVED ASTROMETRY; LUYTEN CATALOG; USNO-B; STARS; KINEMATICS; PHOTOMETRY; SELECTION;

D O I：

10.1088/0004-6256/142/4/116

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate in detail the probability distribution function (pdf) of the proper-motion measurement errors in the SDSS+USNO-B proper-motion catalog of Munn et al. using clean quasar samples. The pdf of the errors is well represented by a Gaussian core with extended wings, plus a very small fraction (<0.1%) of "outliers." We find that while formally the pdf could be well fit by a five-parameter fitting function, for many purposes it is also adequate to represent the pdf with a one-parameter approximation to this function. We apply this pdf to the calculation of the confidence intervals on the true proper motion for an SDSS+USNO-B proper-motion measurement, and discuss several scientific applications of the SDSS proper-motion catalog. Our results have various applications in studies of the galactic structure and stellar kinematics. Specifically, they are crucial for searching hyper-velocity stars in the Galaxy.

引用

页数：10

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