期刊
ASTRONOMICAL JOURNAL
卷 135, 期 4, 页码 1361-1383出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/135/4/1361
关键词
galaxies : dwarf; galaxies : stellar content; methods : numerical; methods : statistical; surveys
资金
- Science and Technology Facilities Council [PP/E00105X/1] Funding Source: researchfish
- STFC [PP/E00105X/1] Funding Source: UKRI
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.
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