The connection between globular cluster systems and their host galaxy and environment: a case study of the isolated elliptical NGC 821
The connection between globular cluster systems and their host galaxy and environment: a case study of the isolated elliptical NGC 821
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球状星团系统与其宿主星系和环境之间的联系：以孤立椭圆NGC 821为例
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Gallagher
中科院分区：
文献类型：
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作者：
L. Spitler;D. Forbes;J. Strader;J. Brodie;J. Gallagher
为了探索孤立椭圆星系的球状星团（GC）系统，对NGC 821的GC系统进行了全面的分析。来自WIYN迷你马赛克成像仪的新图像，加上哈勃太空望远镜（HST） WFPC2的图像，揭示了一个类似于位于高密度环境中对应椭圆的GC系统。为了把这些结果放到星系形成的背景下，提出了一个可靠的GC系统普查，并分析了星系的质量范围（100亿立方米*），形态和环境。
In an effort to probe the globular cluster (GC) system of an isolated elliptical galaxy, a comprehensive analysis of the NGC 821 GC system was performed. New imaging from the WIYN Mini-Mosaic imager, supplemented with Hubble Space Telescope (HST) WFPC2 images reveals a GC system similar to those found in counterpart ellipticals located in high-density environments. To put these results into the context of galaxy formation, a robustly determined census of GC systems is presented and analysed for galaxies spanning a wide range of masses (> M*), morphologies and environments.
Results from this meta-study: (1) confirm previous findings that the number of GCs normalized by host galaxy stellar mass increases with host stellar mass. Spiral galaxies in the sample show smaller relative GC numbers than those of massive ellipticals, suggesting the GC systems of massive ellipticals were not formed from major spiral–spiral mergers; (2) indicate that GC system numbers per unit galaxy baryon mass increases with host baryon mass and that GC formation efficiency may not be universal as previously thought; (3) suggest previously reported trends with environment may be incorrect due to sample bias or the use of galaxy stellar masses to normalize GC numbers. Thus claims for environmentally dependent GC formation efficiencies should be revisited; (4) in combination with weak-lensing halo mass estimates, suggest that GCs formed in direct proportion to the halo mass; (5) are consistent with theoretical predictions whereby the local epoch of reionization did not vary significantly with environment or host galaxy type.
球状星团 - 星系指南
DOI：
10.1007/978-3-540-76961-3
发表时间：
2009
期刊：
影响因子：
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作者：
Fiestas J;Spurzem R.
通讯作者：
Spurzem R.