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首页> 外文期刊>The Astrophysical journal >THE GLOBULAR CLUSTER LUMINOSITY FUNCTION AND SPECIFIC FREQUENCY IN DWARF ELLIPTICAL GALAXIES
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THE GLOBULAR CLUSTER LUMINOSITY FUNCTION AND SPECIFIC FREQUENCY IN DWARF ELLIPTICAL GALAXIES

机译:矮椭圆星系的球团发光度函数和特定频率

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摘要

The globular cluster luminosity function, specific globular cluster frequency, S_N, specific globular cluster mass, T_(MP), and globular cluster mass fraction in dwarf elliptical galaxies are explored using the full 69 galaxy sample of the HST WFPC2 Dwarf Elliptical Galaxy Snapshot Survey. The GCLFs of the dEs are well represented with a t_5 function with a peak at M_(V,Z)~0(dE, HST) = -7.3 ± 0.1. This is ~0.3 mag fainter than the GCLF peaks in giant spiral and elliptical galaxies, but the results are consistent within the uncertainties. The bright-end slope of the luminosity distribution has a power-law form with slope α = -1.9 ± 0.1. The trend of increasing S_N or T_(MP) with decreasing host galaxy luminosity is confirmed. The mean value for T_(MP) in dE,N galaxies is about a factor of 2 higher than the mean value for nonnucleated galaxies and the distributions of T_(MP) in dE,N and dE,noN galaxies are statistically different. These data are combined with results from the literature for a wide range of galaxy types and environments. At low host galaxy masses the distribution of T_(MP) for dE,noN and dI galaxies are similar. This supports the idea that one pathway for forming dE,noN galaxies is by the stripping of dIs. The formation of nuclei and the larger values of T_(mp) in dE,N galaxies may be due to higher star formation rates and star cluster formation efficiencies due to interactions in galaxy cluster environments.
机译:使用HST WFPC2矮椭圆形星系快照调查的全部69个星系样本,探索了矮椭圆形星系中的球状星团发光度函数,特定球状星团频率,S_N,特定球状星团质量,T_(MP)和球状星团质量分数。 dE的GCLF用t_5函数很好地表示,其峰值在M_(V,Z)〜0(dE,HST)= -7.3±0.1。这比巨型螺旋星系和椭圆星系的GCLF峰值弱约0.3 mag,但结果在不确定性范围内是一致的。亮度分布的亮端斜率具有幂律形式,斜率α= -1.9±0.1。可以确定随着主机星系亮度的降低,S_N或T_(MP)升高的趋势。 dE,N星系中T_(MP)的平均值比无核星系的平均值高约2倍,并且dE,N和dE,noN星系中T_(MP)的分布在统计上不同。这些数据与来自各种星系类型和环境的文献结果相结合。在低主星系质量下,dE,noN和dI星系的T_(MP)分布相似。这支持了形成dE,noN星系的一种途径是剥离dI的想法。 dE,N星系中原子核的形成和T_(mp)的较大值可能是由于星系团环境中的相互作用导致更高的恒星形成率和星团形成效率所致。

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