SAGITTARIUS STREAM THREE-DIMENSIONAL KINEMATICS FROM SLOAN DIGITAL SKY SURVEY STRIPE 82

被引：30
作者：
Koposov, Sergey E. [1 ,2 ]
Belokurov, Vasily [1 ]
Evans, N. Wyn [1 ]
机构：
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 766卷 / 02期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
galaxies: dwarf; galaxies: individual (Sagittarius); methods: statistical; proper motions; stars: kinematics and dynamics; MILKY-WAY; DWARF GALAXY; SURVEY VIEW; DATA RELEASE; HALO; STARS; SPECTROSCOPY; CONSTRAINTS; LIGHT; MODEL;
D O I：
10.1088/0004-637X/766/2/79
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using multi-epoch observations of the Stripe 82 region from the Sloan Digital Sky Survey (SDSS), we measure precise statistical proper motions of the stars in the Sagittarius (Sgr) stellar stream. The multi-band photometry and SDSS radial velocities allow us to efficiently select Sgr members and thus enhance the proper-motion precision to similar to 0.1 mas yr(-1). We measure separately the proper motion of a photometrically selected sample of themain-sequence turn-off stars, as well as spectroscopically selected Sgr giants. The data allow us to determine the proper motion separately for the two Sgr streams in the south found in Koposov et al. Together with the precise velocities from SDSS, our proper motions provide exquisite constraints of the three-dimensional motions of the stars in the Sgr streams.
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页数：8
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