期刊
ASTRONOMICAL JOURNAL
卷 138, 期 6, 页码 1667-1680出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/6/1667
关键词
galaxies: individual (Messier: Number M31); galaxies: star clusters; globular clusters: general
资金
- NASA [NAS 5-26555]
- [GO-10818]
- [GO-8296]
Surface brightness profiles for 23 M31 star clusters were measured using images from the Wide Field Planetary Camera 2 on the Hubble Space Telescope, and fitted to two types of models to determine the clusters' structural properties. The clusters are primarily young (similar to 10(8) yr) and massive (similar to 10(4.5) M(circle dot)), with median half-light radius 7 pc and dissolution times of a few Gyr. The properties of the M31 clusters are comparable to those of clusters of similar age in the Magellanic Clouds. Simulated star clusters are used to derive a conversion from statistical measures of cluster size to half-light radius so that the extragalactic clusters can be compared to young massive clusters in the Milky Way. All three sets of star clusters fall approximately on the same age-size relation. The young M31 clusters are expected to dissolve within a few Gyr and will not survive to become old, globular clusters. However, they do appear to follow the same fundamental plane (FP) relations as old clusters; if confirmed with velocity dispersion measurements, this would be a strong indication that the star cluster FP reflects universal cluster formation conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据