Journal Article

The effect of a single supernova explosion on the cuspy density profile of a small-mass dark matter halo

R. S. de Souza, L. F. S. Rodrigues, E. E. O. Ishida and R. Opher

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 3, pages 2969-2973
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18916.x
The effect of a single supernova explosion on the cuspy density profile of a small-mass dark matter halo

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Some observations of galaxies, and in particular dwarf galaxies, indicate a presence of cored density profiles in apparent contradiction with cusp profiles predicted by dark matter N-body simulations. We constructed an analytical model, using particle distribution functions (DFs), to show how a supernova (SN) explosion can transform a cusp density profile in a small-mass dark matter halo into a cored one. Considering the fact that an SN efficiently removes matter from the centre of the first haloes, we study the effect of mass removal through an SN perturbation in the DFs. We find that the transformation from a cusp into a cored profile occurs even for changes as small as 0.5 per cent of the total energy of the halo, which can be produced by the expulsion of matter caused by a single SN explosion.

Keywords: supernovae: general; galaxies: haloes; dark matter

Journal Article.  3368 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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