How tidal erosion has shaped the relation between globular cluster specific frequency and galaxy luminosity

How tidal erosion has shaped the relation between globular cluster specific frequency and galaxy luminosity
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潮汐侵蚀如何影响球状星团特定频率与星系光度之间的关系

DOI:
10.1051/0004-6361/201424005
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发表时间:
2014
影响因子:
6.5
通讯作者:
Brockamp
Brockamp
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mieske;Küpper;A. H. W;Brockamp

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AimsWe量化到什么程度的潮汐侵蚀的球状星团(GC)所观察到的GC特定frequenciesSN和宿主星系luminosityMV之间的U形关系。MethodsWe使用我们的Muesli代码计算GC的生存率为典型的早期型星系的潜力,涵盖了广泛的观测到的星系属性。我们这样做的各向同性和径向各向异性的GC速度distributions.ResultsWe发现,计算的GC生存分数,fs,线性依赖于对数的3D质量密度,ρ3D,在星系的半光半径,\hbox{}。对于一个给定的星系,生存率较低的径向各向异性配置比各向同性GC的情况下。我们将这些关系应用于Harris等人(,ApJ,772,82)的219个早型星系的文献样本,MV = [−24.5:−15.5] ma。GC存活率的范围从最大半径的大质量星系的50%到最紧凑星系的10%。我们发现中等光度星系MV = [−20.5:−17.5]等具有最强的GC侵蚀。在所考虑的文献样本中,预测的GC存活分数因此定义了与MV的U形关系,类似于特定频率SN和MV之间的关系。因此,U形ofSNvs. MV得到几乎完全擦除时校正的GC erosion.ConclusionsTidal erosion的效果的SN values是一个重要的贡献者GC比频率和宿主星系光度之间的U形关系。当从对附近宇宙GC系统的观测中推断原始星星团的形成效率时,必须考虑到这一点。
AimsWe quantify to what extent tidal erosion of globular clusters (GCs) has contributed to the observed U-shaped relation between GC specific frequenciesSNand host galaxy luminosityMV.MethodsWe used our Muesli code to calculate GC survival rates for typical early-type galaxy potentials covering a wide range of observed galaxy properties. We do this for isotropic and radially anisotropic GC velocity distributions.ResultsWe find that the calculated GC survival fraction,fs, depends linearly on the logarithm of the 3D mass density,ρ3D, within the galaxy’s half-light radius, with \hbox{}. For a given galaxy, survival rates are lower for radially anisotropic configurations than for the isotropic GC cases. We apply these relations to a literature sample of 219 early-type galaxies from Harris et al. (, ApJ, 772, 82) in the rangeMV= [−24.5 : −15.5] mag. The expected GC survival fraction ranges from 50% for the most massive galaxies with the largest radii to 10% for the most compact galaxies. We find that intermediate luminosity galaxiesMV= [−20.5 : −17.5] mag have the strongest expected GC erosion. Within the literature sample considered, the predicted GC survival fraction therefore defines a U-shaped relation withMV, similar to the relation between specific frequencySNandMV. As a consequence, the U-shape ofSNvs.MVgets erased almost entirely when correcting theSNvalues for the effect of GC erosion.ConclusionsTidal erosion is an important contributor to the U-shaped relation between GC specific frequency and host galaxy luminosity. It must be taken into account when inferring primordial star cluster formation efficiencies from observations of GC systems in the nearby universe.
球状星团系统的侵蚀:径向各向异性、中心黑洞和动力摩擦的影响
DOI: 10.1093/mnras/stu562
发表时间: 2014
影响因子: 4.8
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