Globular cluster systems in nearby dwarf galaxies – III. Formation efficiencies of old globular clusters
Globular cluster systems in nearby dwarf galaxies – III. Formation efficiencies of old globular clusters
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DOI：
10.1111/j.1365-2966.2010.16802.x
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发表时间：
2010-04
影响因子：
4.8
通讯作者：
I. Georgiev;T. Puzia;P. Goudfrooij;M. Hilker
中科院分区：
文献类型：
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作者：
I. Georgiev;T. Puzia;P. Goudfrooij;M. Hilker
我们研究了球状星团（GC）系统尺度参数形状的起源作为星系质量的函数，即球状星团的特定频率（SN）、特定光度（SL）、特定质量（SM）和特定数量（^ T）。在低质量星系体系（MV -16 mag）中，我们的分析基于哈勃太空望远镜/先进巡天相机对低密度环境中微弱（主要是晚型矮星系）GC群体的观测。为了对星系质量（MV =− 11 至 −23 mag =10 6 –1 0 11 L� ）、环境和形态的整个范围进行采样，我们使用文献中的螺旋星系和椭圆星系数据来增强样本，其中可以可靠地检测到旧的GC。这个大型数据集证实了（无论星系类型如何）在 MV �− 20 mag 的星系星等之上和之下 GC 特定频率的增加。在整个质量范围内，早期型星系的 SL 值平均是晚期型星系的两倍。为了研究观察到的趋势，我们基于 Dekel 和 Birnboim 模型得出了 GC 系统标度参数作为主星系质量函数的理论预测，其中恒星形成过程为 , �,
We investigate the origin of the shape of the globular cluster (GC) system scaling parameters as a function of galaxy mass, i.e. specific frequency (SN), specific luminosity (SL), specific mass (SM) and specific number ( ˆ T ) of GCs. In the low-mass galaxy regime (MV −16 mag), our analysis is based on Hubble Space Telescope/Advanced Camera for Surveys observations of GC populations of faint, mainly late-type dwarf galaxies in low-density environments. In order to sample the entire range in galaxy mass (MV =− 11 to −23 mag =10 6 –1 0 11 L� ), environment and morphology we augment our sample with data of spiral and elliptical galaxies from the literature, in which old GCs are reliably detected. This large data set confirms (irrespective of the galaxy type) the increase in the specific frequencies of GCs above and below a galaxy magnitude of MV �− 20 mag. Over the full mass range, the SL value of early-type galaxies is, on average, twice that of late types. To investigate the observed trends, we derive theoretical predictions of GC system scaling parameters as a function of host galaxy mass based on the models of Dekel and Birnboim in which star formation processes are , �,