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首页> 外文期刊>The Astrophysical journal >THE U-SHAPED DISTRIBUTION OF GLOBULAR CLUSTER-SPECIFIC FREQUENCIES IN A BIASED GLOBULAR CLUSTER FORMATION SCENARIO
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THE U-SHAPED DISTRIBUTION OF GLOBULAR CLUSTER-SPECIFIC FREQUENCIES IN A BIASED GLOBULAR CLUSTER FORMATION SCENARIO

机译：偏置球团形成场景中球团特定频率的U形分布

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摘要

Using high-resolution numerical simulations, we investigate mass- and luminosity-normalized specific frequencies (T_N and S_N, respectively) of globular cluster systems (GCSs) in order to understand the origin of the observed U-shaped relation between S_N and the V-band magnitude (M_V) of their host galaxies. We adopt a biased GC formation scenario in which GC formation is truncated in galaxy halos that are virialized at a later redshift, z_(trun). T_N is derived for galaxies with present-day GCs and converted into S_N for reasonable galaxy mass-to-light ratios (M/L). We find that T_N depends on halo mass (M_h) in the sense that T_N can be larger in more massive halos with M_h > 10~9 solar mass, if z_(trun) is as high as 15. However, we find that the dependence is too weak to explain the observed S_N-M_V relation and the wide range of S_N in low-mass early-type galaxies with -20.5 mag < M_V < -16.0 mag for a reasonable constant MIL. The M_V dependence of S_N for the low-mass galaxies can be well reproduced, if the mass-to-light ratio M_h/L_V ∝ M_h~α, where a is as steep as —1. Based on these results, we propose that the origin of the observed U-shaped S_N-M_V relation of GCSs can be understood in terms of the bimodality in the dependence of M_h/L_V on M_h of their host galaxies. We also suggest that the observed large dispersion in S_N in low-mass galaxies is due partly to the large dispersion in T_N.
机译：使用高分辨率数值模拟，我们研究了球状星团系统（GCS）的质量和光度归一化的特定频率（分别为T_N和S_N），以便了解S_N与V-它们的主星系的波段大小（M_V）。我们采用有偏的GC形成方案，其中GC形成在星系光晕中被截断，该星光在以后的红移z_（trun）中被病毒化。 T_N是针对具有当前GC的星系得出的，对于合理的星系质光比（M / L），它会转换为S_N。我们发现T_N取决于光晕质量（M_h），这是因为如果z_（trun）高达15，则在M_h> 10〜9太阳质量的更大质量的光晕中T_N可以更大。但是，我们发现依赖关系太弱了，无法解释观察到的S_N-M_V关系以及在合理质量常数MIL的-20.5 mag

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