Stellar envelopes of globular clusters embedded in dark mini-haloes
Stellar envelopes of globular clusters embedded in dark mini-haloes
复制标题
嵌入暗迷你晕中的球状星团的恒星包层
DOI:
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复制
发表时间:
2017
期刊:
影响因子:
--
通讯作者:
R. S'anchez
中科院分区:
文献类型:
--
作者:
J. Peñarrubia;A. Varri;Philip G. Breen;A. Ferguson;R. S'anchez
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:
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影响因子:
--
作者:
Birkinshaw M
通讯作者:
Birkinshaw M
影响因子:
6.5
作者:
Kamann;Wisotzki
通讯作者:
Wisotzki