Andromeda X, a New Dwarf Spheroidal Satellite of M31: Photometry

Andromeda X, a New Dwarf Spheroidal Satellite of M31: Photometry
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M31 的新型矮球体卫星仙女座 X:光度测量

DOI:
10.1086/516748
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发表时间:
2006
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
S. Snedden
S. Snedden
中科院分区:
--
文献类型:
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作者:
D. Zucker;D. Zucker;A. Kniazev;D. Martinez;D. Martinez;E. Bell;H. Rix;E. Grebel;J. Holtzman;R. Walterbos;C. Rockosi;D. York;J. Barentine;H. Brewington;J. Brinkmann;M. Harvanek;S. Kleinman;J. Krzesinski;J. Krzesinski;D. Long;E. Neilsen;A. Nitta;S. Snedden

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我们根据斯隆数字巡天的恒星光度测量结果报告了仙女座 X 的发现,这是 M31 的一颗新矮椭球体卫星。使用后续成像数据,我们估计了它的距离和其他物理特性。我们发现仙女座 X 的中心表面亮度为 μV,0 ~ 26.7 mag arcsec-2,总视星等为 Vtot ~ 16.1,在导出的距离模数 (m - M)0 ~ 24.12-24.34 下,产生绝对星等 MV ~ -8.1 ± 0.5;这些值与之前发现的低光度 M31 卫星仙女座 IX 的值相当。过去几年中仙女座 X 以及 M31 和银河系周围许多其他极其微弱的卫星的发现表明,此类天体在本星系群中可能大量存在。
We report the discovery of Andromeda X, a new dwarf spheroidal satellite of M31, based on stellar photometry from the Sloan Digital Sky Survey. Using follow-up imaging data we have estimated its distance and other physical properties. We find that Andromeda X has a dereddened central surface brightness of μV, 0 ~ 26.7 mag arcsec-2 and a total apparent magnitude of Vtot ~ 16.1, which at the derived distance modulus, (m - M)0 ~ 24.12-24.34, yields an absolute magnitude of MV ~ -8.1 ± 0.5; these values are quite comparable to those of Andromeda IX, a previously discovered low-luminosity M31 satellite. The discoveries of Andromeda X and of numerous other extremely faint satellites around M31 and the Milky Way in the past few years suggest that such objects may be plentiful in the Local Group.