2014A&A...569A.114B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.22CEST08:54:15

2014A&A...569A.114B - Astronomy and Astrophysics, volume 569A, 114-114 (2014/9-1)

Relaxation of dark matter halos: how to match observational data?

BAUSHEV A.N.

Abstract (from CDS):

We show that moderate energy relaxation in the formation of dark matter halos invariably leads to profiles that match those observed in the central regions of galaxies. The density profile of the central region is universal and insensitive to either the seed perturbation shape or the details of the relaxation process. The profile has a central core; the multiplication of the central density by the core radius is almost independent of the halo mass, in accordance with observations. In the core area the density distribution behaves as an Einasto profile with low index (n∼0.5); it has an extensive region with ρ∝r–2 at larger distances. This is exactly the shape that observations suggest for the central region of galaxies. On the other hand, this shape does not fit the galaxy cluster profiles. A possible explanation of this fact is that the relaxation is violent in the case of galaxy clusters; however, it is not violent enough when galaxies or smaller dark matter structures are considered. We discuss the reasons for this.

Abstract Copyright:

Journal keyword(s): dark matter - Galaxy: structure - Galaxy: formation - astroparticle physics - methods: analytical

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11051 1
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11758 0
3 NAME Local Group GrG ~ ~           ~ 7071 0

    Equat.    Gal    SGal    Ecl

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2020.10.22-08:54:15

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