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
复制标题
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
中科院分区:
文献类型:
--
作者:
Mieske;Küpper;A. H. W;Brockamp
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.
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影响因子:
4.8
作者:
Brockamp;Küpper;A. H. W;Baumgardt;Kroupa
通讯作者:
Kroupa
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
L. Spitler;D. Forbes;J. Strader;J. Brodie;J. Gallagher
通讯作者:
J. Gallagher
DOI:
10.1046/j.1365-8711.2000.03869.x
发表时间:
2000
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Vesperini
通讯作者:
E. Vesperini
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
D. Forbes
通讯作者:
D. Forbes
DOI:
10.1111/j.1365-2966.2012.21368.x
发表时间:
2012
影响因子:
4.8
作者:
D. Forbes;T. Ponman;E. O’Sullivan
通讯作者:
E. O’Sullivan