2013A&A...551A..68M


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET05:05:59

2013A&A...551A..68M - Astronomy and Astrophysics, volume 551A, 68-68 (2013/3-1)

Mass limits for dark clusters of degenerate fermions.

MEMBRADO M. and PACHECO A.F.

Abstract (from CDS):

We calculate the range of possible masses for dark spheres of bound fully degenerate fermions as a function of the fermion mass. The cosmological constant is included in our calculations. We deduce that the minimum fermion mass that is able to give rise to degenerate fermion clusters is ∼0.02g–1/4eV, where g is the spin degeneracy parameter. We show that degenerate fermions of m c2≃(15-30)g–1/4eV can build bound degenerate dark haloes that could reproduce the values of the rotation velocities of galaxies. The masses and radii derived for these degenerate dark haloes of typical galaxies, without considering any cosmological information, agree with the Jeans masses and radii of a cosmological background of ~(20-30)g–1/4eV degenerate fermions at redshift z≃50. However, degenerate fermion objects of 1015M composed of these particles are too small to constitute the dark halo of galaxy clusters. We also derive degeneracy conditions for hot and cold dark matter fermions.

Abstract Copyright:

Journal keyword(s): dark matter - dark energy

Simbad objects: 6

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Number of rows : 6

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 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 359 2
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14375 1
3 NGC 2259 OpC 06 38 34.4 +10 53 24     10.8     ~ 21 0
4 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 682 2
5 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 333 1
6 NAME Local Group GrG ~ ~           ~ 6697 0

    Equat.    Gal    SGal    Ecl

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2019.12.07-05:05:59

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