Numerical color-magnitude diagram analysis of sloan digital sky survey data and application to the new milky way satellites

J. T A De Jong, H. W. Rix, N. F. Martin, D. B. Zucker, A. E. Dolphin, E. F. Bell, V. Belokurov, N. W. Evans

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1361-1383
Number of pages23
JournalAstronomical Journal
Volume135
Issue number4
DOIs
Publication statusPublished - 1 Apr 2008
Externally publishedYes

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