Stellar envelopes of globular clusters embedded in dark mini-haloes

Stellar envelopes of globular clusters embedded in dark mini-haloes
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嵌入暗迷你晕中的球状星团的恒星包层

DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
R. S'anchez
R. S'anchez
中科院分区:
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文献类型:
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作者:
J. Peñarrubia;A. Varri;Philip G. Breen;A. Ferguson;R. S'anchez

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我们表明,在嵌入暗物质(DM)晕的球状星团中心区域的艰难遭遇必然会导致引力束缚的恒星包层的形成,这些恒星包层远远超出了系统的名义潮汐半径。利用统计论证和数值方法,导出了非发散球势中心抛射恒星的平衡分布函数。与恒星抛射的速度分布无关,GC包层的密度分布在距离较远的地方逐渐接近$\rho\sim r^{-4}$,并向中心趋近于等温。添加DM光晕成分留下了两个明确的观测特征:(i)在远距离上的投影速度色散剖面变平或略有增加,以及(ii)外表面密度剖面系统地比没有暗物质的模型浅。
We show that hard encounters in the central regions of globular clusters embedded in dark matter (DM) haloes necessarily lead to the formation of gravitationally-bound stellar envelopes that extend far beyond the nominal tidal radius of the system. Using statistical arguments and numerical techniques we derive the equilibrium distribution function of stars ejected from the centre of a non-divergent spherical potential. Independently of the velocity distribution with which stars are ejected, GC envelopes have density profiles that approach asymptotically $\rho\sim r^{-4}$ at large distances and become isothermal towards the centre. Adding a DM halo component leaves two clear-cut observational signatures: (i) a flattening, or slightly increase of the projected velocity dispersion profile at large distances, and (ii) an outer surface density profile that is systematically shallower than in models with no dark matter.
DOI: 10.1007/978-1-4020-6941-3_8
发表时间: 2008
期刊: --
影响因子: --
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