No compelling evidence of significant early star cluster disruption in the Large Magellanic Cloud

被引:14
作者
de Grijs, Richard [1 ,2 ]
Goodwin, Simon P. [3 ]
Anders, Peter [1 ,4 ]
机构
[1] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
[2] Peking Univ, Dept Astron, Beijing 100871, Peoples R China
[3] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[4] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
基金
中国国家自然科学基金;
关键词
galaxies: evolution; galaxies: individual: Large Magellanic Cloud; Magellanic Clouds; galaxies: star clusters: general; EVOLUTIONARY SYNTHESIS MODELS; GRAVITATIONAL LENSING EXPERIMENT; FORMATION HISTORY; AGE DISTRIBUTION; STELLAR POPULATIONS; CONFIDENCE LEVELS; INTEGRATED LIGHT; MASS; GALAXIES; CATALOG;
D O I
10.1093/mnras/stt1541
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Whether or not the rich star cluster population in the Large Magellanic Cloud (LMC) is affected by significant disruption during the first few x 10(8) yr of its evolution is an open question and the subject of significant current debate. Here, we revisit the problem, adopting a homogeneous data set of broad-band imaging observations. We base our analysis mainly on two sets of self-consistently determined LMC cluster ages and masses, one using standard modelling and one which takes into account the effects of stochasticity in the clusters' stellar mass functions. On their own, the results based on any of the three complementary analysis approaches applied here are merely indicative of the physical conditions governing the cluster population. However, the combination of our results from all three different diagnostics leaves little room for any conclusion other than that the optically selected LMC star cluster population exhibits no compelling evidence of significant disruption - for clusters with masses, M-cl, of log (M-cl/M-circle dot) greater than or similar to 3.0-3.5 - between the age ranges of [3-10 and 30-100] Myr, either 'infant mortality' or otherwise. In fact, there is no evidence of any destruction beyond that expected from simple models just including stellar dynamics and stellar evolution for ages up to 1 Gyr. It seems, therefore, that the difference in environmental conditions in the Magellanic Clouds on the one hand and significantly more massive galaxies on the other may be the key to understanding the apparent variations in cluster disruption behaviour at early times.
引用
收藏
页码:136 / 149
页数:14
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