DISTANCE TO THE SAGITTARIUS DWARF GALAXY USING MACHO PROJECT RR LYRAE STARS

被引：46
作者：
Kunder, Andrea [1 ]
Chaboyer, Brian [1 ]
机构：
[1] Dartmouth Coll, Hanover, NH 03755 USA
来源：
ASTRONOMICAL JOURNAL | 2009年 / 137卷 / 05期
关键词：
galaxies: dwarf; galaxies: individual (Sagittarius); Galaxy: center; stars: abundances; stars: distances; stars: Population II; surveys; GALACTIC GLOBULAR-CLUSTERS; MILKY-WAY; SPHEROIDAL GALAXY; BULGE; PHOTOMETRY; POPULATION; CLUMP; HALO; M54; KINEMATICS;
D O I：
10.1088/0004-6256/137/5/4478
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We derive the distance to the northern extension of the Sagittarius (Sgr) dwarf spheroidal galaxy from 203 Sgr RR0 Lyrae stars found in the MACHO database. Their distances are determined differentially with respect to 288 Galactic bulge RR0 Lyrae stars also found in the MACHO data. We find a distance modulus difference of 2.41 mag at l = 5 degrees and b = -8 degrees and that the extension of the Sgr galaxy toward the galactic plane is inclined toward us. Assuming RGC = 8 kpc, this implies the distance to these stars is (m - M)(0) = 16.97 +/- 0.07 mag, which corresponds to D = 24.8 +/- 0.8 kpc. Although this estimate is smaller than previous determinations for this galaxy and agrees with previous suggestions that Sgr's body is truly closer to us, this estimate is larger than studies at comparable galactic latitudes.
引用
收藏
页码：4478 / 4486
页数：9
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