NUMERICAL COLOR–MAGNITUDE DIAGRAM ANALYSIS OF SLOAN DIGITAL SKY SURVEY DATA AND APPLICATION TO THE NEW MILKY WAY SATELLITES
NUMERICAL COLOR–MAGNITUDE DIAGRAM ANALYSIS OF SLOAN DIGITAL SKY SURVEY DATA AND APPLICATION TO THE NEW MILKY WAY SATELLITES
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DOI：
10.1088/0004-6256/135/4/1361
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发表时间：
2007-08
期刊：
影响因子：
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通讯作者：
J. D. Jong;H. Rix;N. F. Martin;D. Zucker;A. Dolphin;E. F. Bell;V. Belokurov;N. W. E. Mpia;Heidelberg IoA;Cambridge Steward Obs.;Tucson
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文献类型：
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作者：
J. D. Jong;H. Rix;N. F. Martin;D. Zucker;A. Dolphin;E. F. Bell;V. Belokurov;N. W. E. Mpia;Heidelberg IoA;Cambridge Steward Obs.;Tucson
我们已经测试了应用程序斯隆数字巡天（SDSS）数据的软件包匹配，它适合颜色星等图（CMD）估计恒星的人口参数和距离。在一组六个球状星团上的测试表明，这些技术恢复了它们的已知特性。使用CMD拟合软件的新方法使我们能够处理恒星沿着视线的扩展分布，以约束人口稀少的物体的整体属性，并在广域调查中检测恒星过密度的存在。然后，我们也适用于12个最近发现的银河系卫星的CMD匹配，以统一的方式获得他们的距离，年龄和金属丰度。虽然它们中的大多数看起来与单一的恒星群体一致，但CVn I，Uma II和Leo T（仅从SDSS数据来看）表现出更复杂的历史，具有多个星星形成时期。
We have tested the application to Sloan Digital Sky Survey (SDSS) data of the software package MATCH, which fits color–magnitude diagrams (CMDs) to estimate stellar population parameters and distances. These tests on a set of six globular clusters show that these techniques recover their known properties. New ways of using the CMD-fitting software enable us to deal with an extended distribution of stars along the line-of-sight, to constrain the overall properties of sparsely populated objects, and to detect the presence of stellar overdensities in wide-area surveys. We then also apply MATCH to CMDs for 12 recently discovered Milky Way satellites to derive in a uniform fashion their distances, ages, and metallicities. While the majority of them appear consistent with a single stellar population, CVn I, UMa II, and Leo T exhibit (from SDSS data alone) a more complex history with multiple epochs of star formation.