The proper motion of the Large Magellanic Cloud using HST

被引：289
作者：
Kallivayalil, N
van der Marel, RP
Alcock, C
Axelrod, T
Cook, KH
Drake, AJ
Geha, M
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[4] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
[5] CALTECH, Ctr Adv Comp Res, Pasadena, CA 91125 USA
[6] Carnegie Observ, Pasadena, CA 91101 USA
来源：
ASTROPHYSICAL JOURNAL | 2006年 / 638卷 / 02期
关键词：
Magellanic Clouds;
D O I：
10.1086/498972
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a measurement of the systemic proper motion of the Large Magellanic Cloud (LMC) from astrometry with the High Resolution Camera (HRC) of the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). We observed LMC fields centered on 21 background QSOs that were discovered from their optical variability in the MACHO database. The QSOs are distributed homogeneously behind the central few degrees of the LMC. With two epochs of HRC data and a similar to 2 yr baseline, we determine the proper motion of the LMC to better than 5% accuracy: mu(w) = 2: 03 +/- 0: 08 mas yr(-1), and mu(N) = 0:44 +/- 0: 05 mas yr(-1). This is the most accurate proper- motion measurement for any Milky Way satellite thus far. When combined with H I data from the Magellanic Stream, this should provide new constraints on both the mass distribution of the Galactic halo and models of the Stream.
引用
收藏
页码：772 / 785
页数：14
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