An accurate distance to high-velocity cloud Complex C

被引：118
作者：
Thom, C. [1 ,2 ]
Peek, J. E. G. [3 ]
Putman, M. E. [4 ]
Heiles, Carl [3 ]
Peek, K. M. G. [3 ]
Wilhelm, R. [5 ]
机构：
[1] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[2] Univ Chicago, Inst Cosmol Phys, Chicago, IL 60637 USA
[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[4] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
[5] Texas Tech Univ, Dept Phys, Lubbock, TX 79409 USA
来源：
ASTROPHYSICAL JOURNAL | 2008年 / 684卷 / 01期
基金：
美国国家科学基金会;
关键词：
galaxy : evolution; galaxy : halo; ISM : clouds; ISM : individual (Complex C);
D O I：
10.1086/589960
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report an accurate distance of d = 10 +/- 2.5 kpc to the high-velocity cloud Complex C. Using high signal-to-noise ratio Keck HIRES spectra of two horizontal-branch stars, we have detected Ca II K absorption lines from the cloud. Significant nondetections toward a further three stars yield robust lower distance limits. The resulting H I mass of Complex C is M-HI = 4.9(-2.2)(+2.9); 10(6) M-circle dot; a total mass of M-tot = 8.2(-2.6)(+4.6); 10(6) M-circle dot is implied, after corrections for helium and ionization. At 10 kpc, Complex C has physical dimensions 3; 15 kpc, and if it is as thick as it is wide, then the average density is log < n > similar or equal to -2.5. We estimate the contribution of Complex C to the mass influx may be as high as similar to 0.14 M-circle dot yr(-1).
引用
收藏
页码：364 / 372
页数：9
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