文章基本信息

标题：MEASURING CONSISTENT MASSES FOR 25 MILKY WAY GLOBULAR CLUSTERS
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作者：Brian Kimmig ; Anil Seth ; Inese I. Ivans 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2015
卷号：149
期号：2
DOI：10.1088/0004-6256/149/2/53
语种：English
出版社：American Institute of Physics
摘要：We present central velocity dispersions, masses, mass-to-light ratios ( ), and rotation strengths for 25 Galactic globular clusters (GCs). We derive radial velocities of 1951 stars in 12 GCs from single order spectra taken with Hectochelle on the MMT telescope. To this sample we add an analysis of available archival data of individual stars. For the full set of data we fit King models to derive consistent dynamical parameters for the clusters. We find good agreement between single-mass King models and the observed radial dispersion profiles. The large, uniform sample of dynamical masses we derive enables us to examine trends of with cluster mass and metallicity. The overall values of and the trends with mass and metallicity are consistent with existing measurements from a large sample of M31 clusters. This includes a clear trend of increasing with cluster mass and lower than expected for the metal-rich clusters. We find no clear trend of increasing rotation with increasing cluster metallicity suggested in previous work.
关键词：globular clusters: general;globular clusters: individual (M2; M3; M14; M71; NGC 4147; NGC 5053; NGC 5466; NGC 6934; 47Tuc; M5; NGC 6441; M12; M15; M53; M92; NGC 6752; M4; M22; M30; M54; M55; M68; NGC 288; NGC 362) Supporting material: machine-readable and VO tables