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Chinese Academy of Sciences Institutional Repositories Grid
THE SEGUE K GIANT SURVEY. II. A CATALOG OF DISTANCE DETERMINATIONS FOR THE SEGUE K GIANTS IN THE GALACTIC HALO

文献类型:期刊论文

作者Xue, Xiang-Xiang1,2; Ma, Zhibo3; Rix, Hans-Walter1; Morrison, Heather L.3; Harding, Paul3; Beers, Timothy C.4,5; Ivans, Inese I.6; Jacobson, Heather R.7,8; Johnson, Jennifer9,10; Lee, Young Sun11
刊名ASTROPHYSICAL JOURNAL
出版日期2014-04-01
卷号784期号:2
关键词galaxies: individual (Milky Way) Galaxy: halo stars: distances stars: individual (K giants)
英文摘要We present an online catalog of distance determinations for 6036 K giants, most of which are members of the Milky Way's stellar halo. Their medium-resolution spectra from the Sloan Digital Sky Survey/Sloan Extension for Galactic Understanding and Exploration are used to derive metallicities and rough gravity estimates, along with radial velocities. Distance moduli are derived from a comparison of each star's apparent magnitude with the absolute magnitude of empirically calibrated color-luminosity fiducials, at the observed (g - r)(0) color and spectroscopic [Fe/H]. We employ a probabilistic approach that makes it straightforward to properly propagate the errors in metallicities, magnitudes, and colors into distance uncertainties. We also fold in prior information about the giant-branch luminosity function and the different metallicity distributions of the SEGUE K-giant targeting sub-categories. We show that the metallicity prior plays a small role in the distance estimates, but that neglecting the luminosity prior could lead to a systematic distance modulus bias of up to 0.25 mag, compared to the case of using the luminosity prior. We find a median distance precision of 16%, with distance estimates most precise for the least metal-poor stars near the tip of the red giant branch. The precision and accuracy of our distance estimates are validated with observations of globular and open clusters. The stars in our catalog are up to 125 kpc from the Galactic center, with 283 stars beyond 50 kpc, forming the largest available spectroscopic sample of distant tracers in the Galactic halo.
收录类别SCI
语种英语
WOS记录号WOS:000335519400085
源URL[http://ir.bao.ac.cn/handle/114a11/6613]  
专题国家天文台_光学天文研究部
作者单位1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
3.Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA
4.Natl Opt Astron Observ, Tucson, AZ 85719 USA
5.Univ Notre Dame, JINA, Dept Phys, Notre Dame, IN 46556 USA
6.Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
7.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48823 USA
8.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
9.4055 McPherson Lab, Dept Astron, Columbus, OH 43210 USA
10.Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
推荐引用方式
GB/T 7714
Xue, Xiang-Xiang,Ma, Zhibo,Rix, Hans-Walter,et al. THE SEGUE K GIANT SURVEY. II. A CATALOG OF DISTANCE DETERMINATIONS FOR THE SEGUE K GIANTS IN THE GALACTIC HALO[J]. ASTROPHYSICAL JOURNAL,2014,784(2).
APA Xue, Xiang-Xiang.,Ma, Zhibo.,Rix, Hans-Walter.,Morrison, Heather L..,Harding, Paul.,...&Prieto, Carlos Allende.(2014).THE SEGUE K GIANT SURVEY. II. A CATALOG OF DISTANCE DETERMINATIONS FOR THE SEGUE K GIANTS IN THE GALACTIC HALO.ASTROPHYSICAL JOURNAL,784(2).
MLA Xue, Xiang-Xiang,et al."THE SEGUE K GIANT SURVEY. II. A CATALOG OF DISTANCE DETERMINATIONS FOR THE SEGUE K GIANTS IN THE GALACTIC HALO".ASTROPHYSICAL JOURNAL 784.2(2014).

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来源:国家天文台

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