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AN UPDATED CATALOG OF M31 GLOBULAR-LIKE CLUSTERS: UBVRI PHOTOMETRY, AGES, AND MASSES
Fan, Zhou1; de Grijs, Richard2; Zhou, Xu1
2010-12-01
发表期刊ASTROPHYSICAL JOURNAL
卷号725期号:1页码:200-213
摘要We present an updated UBVRI photometric catalog containing 970 objects in the field of M31, selected from the Revised Bologna Catalog (RBC v. 4.0), including 965, 967, 965, 953, and 827 sources in the individual UBVRI bands, respectively, of which 205, 123, 14, 126, and 109 objects do not have previously published photometry. Photometry is performed using archival images from the Local Group Galaxies Survey, which covers 2.2 deg(2) along the major axis of M31. Detailed comparisons show that our photometry is fully consistent with previous measurements in all filters. We focus on 445 confirmed "globular-like" clusters and candidates, comprising typical globular and young massive clusters. The ages and masses of these objects are derived by comparing their observed spectral-energy distributions with simple stellar population synthesis. Approximately half of the clusters are younger than 2 Gyr, suggesting that there has been significant recent active star formation in M31, which is consistent with previous results. We note that clusters in the halo (r(projected) > 30 kpc) are composed of two different components: older clusters with ages >10 Gyr and younger clusters with ages around 1 Gyr. The spatial distributions show that the young clusters (<2 Gyr) are spatially coincident with the galaxy's disk, including the "10 kpc ring," the " outer ring," and the halo of M31, while the old clusters (>2 Gyr) are spatially correlated with the bulge and halo. We also estimate the masses of the 445 confirmed clusters and candidates in M31 and find that our estimates agree well with previously published values. We find that none of the young disk clusters can survive the inevitable encounters with giant molecular clouds in the galaxy's disk and that they will eventually be disrupted on timescales of a few Gyr. Specifically, young disk clusters with a mass of 10(4) M-circle dot are expected to dissolve within 3.0 Gyr and will, thus, not evolve to become globular clusters.
关键词Catalogs Galaxies: Individual (M31) Galaxies: Star Clusters: General Globular Clusters: General
DOI10.1088/0004-637X/725/1/200
收录类别SCI
语种英语
WOS记录号WOS:000284576700038
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被引频次:22[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7744
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
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Fan, Zhou,de Grijs, Richard,Zhou, Xu. AN UPDATED CATALOG OF M31 GLOBULAR-LIKE CLUSTERS: UBVRI PHOTOMETRY, AGES, AND MASSES[J]. ASTROPHYSICAL JOURNAL,2010,725(1):200-213.
APA Fan, Zhou,de Grijs, Richard,&Zhou, Xu.(2010).AN UPDATED CATALOG OF M31 GLOBULAR-LIKE CLUSTERS: UBVRI PHOTOMETRY, AGES, AND MASSES.ASTROPHYSICAL JOURNAL,725(1),200-213.
MLA Fan, Zhou,et al."AN UPDATED CATALOG OF M31 GLOBULAR-LIKE CLUSTERS: UBVRI PHOTOMETRY, AGES, AND MASSES".ASTROPHYSICAL JOURNAL 725.1(2010):200-213.
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