Effect of small-scale density perturbations on the formation of dark matter halo profiles

被引：5

作者：

Pilipenko, S. V. ^{[1
,2
]}

Doroshkevich, A. G. ^{[1
]}

Lukash, V. N. ^{[1
]}

Mikheeva, E. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Lebedev Phys Inst, Astro Space Ctr, Moscow 117997, Russia

[2] Moscow Inst Phys & Technol, Dolgoprudnyj 141700, Russia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 427卷 / 01期

关键词：

galaxies: haloes; dark matter; GRAVITATIONAL COLLAPSE; SUBSTRUCTURE; POWER;

D O I：

10.1111/j.1745-3933.2012.01339.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With the help of a set of toy N-body models of dark halo formation, we study the impact of small-scale initial perturbations on the inner density profiles of haloes. We find a significant flattening of the inner slope alpha = d log rho/d log r to alpha = -0.5 in some range of scales and amplitudes of the perturbations (while in the case of absence of these perturbations, the NavarroFrenkWhite profile with alpha = -1 is reproduced). This effect may be responsible for the formation of cuspless galactic haloes.

引用

页码：L30 / L34

页数：5

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