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arXiv 1705.03370astro-ph.GA
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GOALS亮红外星系中大质量团簇形成和毁灭

Massive Star Cluster Formation and Destruction in Luminous Infrared Galaxies in GOALS

S. T. Linden, A. S. Evans, J. Rich, K. Larson, L. Armus, T. Díaz-Santos, G. C. Privon, J. Howell, H. Inami, D. -C. Kim, L. -H. Chien, T. Vavilkin, J. M. Mazzare… 展开作者

S. T. Linden, A. S. Evans, J. Rich, K. Larson, L. Armus, T. Díaz-Santos, G. C. Privon, J. Howell, H. Inami, D. -C. Kim, L. -H. Chien, T. Vavilkin, J. M. Mazzarella, J. A. Surace, S. Manning, A. Abdullah, A. Blake, A. Yarber, T. Lambert

摘要:

本文介绍了{ \it Hubble Space Telescope} ACS/HRC FUV,ACS/WFC对大天文台全天LIRG巡天中22个亮红外星系团的光学研究结果。通过综合宽带测光,我们得出了这些系统中包含的484个星团的年龄和质量。这使我们能够研究在LIRGs的极端环境中发现的星团的性质,相对于本地宇宙中较低光度的恒星形成星系。采用Bruzual \& Charlot简单恒星星族(SSP)模型和Salpeter初始质量函数,我们发现星系团的年龄分布呈$dN/dτ= τ^{-0.9 +/- 0.3}$式递减,这与我们推导的银河系年龄分布一致,并解释了在合并星系的强潮汐场中星系团快速破裂的证据.在样本中发现的大量$10^{6} M_{\odot}$年轻星系团也表明,LIRGs能够产生更多的高质量星系团,而不是迄今为止在本地宇宙中任何低光度恒星形成星系中观察到的。观测到的$dN/dM = M^{-1.95 +/- 0.11}$星系团质量分布与用于描述星系团初始质量函数(ICMF)的正则-2幂律一致。我们将此解释为反对质量依赖的集群破坏的证据,这将使所观察到的CMF相对于基本的ICMF分布变平。

英文摘要:

We present the results of a {\it Hubble Space Telescope} ACS/HRC FUV, ACS/WFC optical study into the cluster populations of a sample of 22 Luminous Infrared Galaxies in the Great Observatories All-Sky LIRG Survey. Through integrated broadband photometry we have derived ages and masses for a total of 484 star clusters contained within these systems. This allows us to examine the properties of star clusters found in the extreme environments of LIRGs relative to lower luminosity star-forming galaxies in the local Universe. We find that by adopting a Bruzual \& Charlot simple stellar population (SSP) model and Salpeter initial mass function, the age distribution of clusters declines as $dN/dτ= τ^{-0.9 +/- 0.3}$, consistent with the age distribution derived for the Antennae Galaxies, and interpreted as evidence for rapid cluster disruption occuring in the strong tidal fields of merging galaxies. The large number of $10^{6} M_{\odot}$ young clusters identified in the sample also suggests that LIRGs are capable of producing more high-mass clusters than what is observed to date in any lower luminosity star-forming galaxy in the local Universe. The observed cluster mass distribution of $dN/dM = M^{-1.95 +/- 0.11}$ is consistent with the canonical -2 power law used to describe the underlying initial cluster mass function (ICMF) for a wide range of galactic environments. We interpret this as evidence against mass-dependent cluster disruption, which would flatten the observed CMF relative to the underlying ICMF distribution.

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