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

Authors

  • S. V. Pilipenko,

    Corresponding author
    1. Astro Space Centre of Lebedev Physical Institute of Russian Academy of Sciences, 84/32 Profsojuznaja Street, 117997 Moscow, Russia
    2. Moscow Institute of Physics and Technology, Institutskij per. 9, 141700 Dolgoprudnyj, Russia
      E-mail: spilipenko@asc.rssi.ru
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  • A. G. Doroshkevich,

    1. Astro Space Centre of Lebedev Physical Institute of Russian Academy of Sciences, 84/32 Profsojuznaja Street, 117997 Moscow, Russia
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  • V. N. Lukash,

    1. Astro Space Centre of Lebedev Physical Institute of Russian Academy of Sciences, 84/32 Profsojuznaja Street, 117997 Moscow, Russia
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  • E. V. Mikheeva

    1. Astro Space Centre of Lebedev Physical Institute of Russian Academy of Sciences, 84/32 Profsojuznaja Street, 117997 Moscow, Russia
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E-mail: spilipenko@asc.rssi.ru

ABSTRACT

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 inline image to α=−0.5 in some range of scales and amplitudes of the perturbations (while in the case of absence of these perturbations, the Navarro–Frenk–White profile with α=−1 is reproduced). This effect may be responsible for the formation of cuspless galactic haloes.

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