Degenerate sterile neutrino dark matter in the cores of galaxies

Free access article

Issue		A&A Volume 458, Number 2, November I 2006


Page(s)		L9 - L12
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20065710

A&A 458, L9-L12 (2006)
DOI: 10.1051/0004-6361:20065710

Letter

Degenerate sterile neutrino dark matter in the cores of galaxies

F. Munyaneza¹ and P. L. Biermann^{1, 2, 3}

¹ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
e-mail: munyanez@mpifr-bonn.mpg.de
² Department of Physics and Astrononomy, University of Bonn, Germany
³ Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, USA

(Received 29 May 2006 / Accepted 25 August 2006)

Abstract
Aims.We study the distribution of fermionic dark matter at the center of galaxies using NFW, Moore and isothermal density profiles and show that dark matter becomes degenerate for particle masses of a few keV and for distances less than a few parsec from the center of our galaxy.
Methods.A compact degenerate core forms after galaxy merging and boosts the growth of supermassive black holes at the center of galaxies.
Results.To explain the galactic center black hole of mass of ~3.5 $\times$ $10^{6}~M_{\odot}$ and a supermassive black hole of ~3 $\times$ $10^{9}~M_{\odot}$ at a redshift of 6.41 in SDSS quasars, we require a degenerate core of mass between 3 $\times$ $10^{3}~M_{\odot}$ and 3.5 $\times$ $10^{6}~M_{\odot}$ . This constrains the mass of the dark matter particle between $0.6~{\rm keV}$ and $82~{\rm keV}$ . The lower limit on the dark matter mass is improved to 7 keV if exact solutions of Poisson's equation are used in the isothermal power law case. We argue that the constrained particle could be the long sought dark matter of the Universe that is interpreted here as a sterile neutrino.

Key words: black hole physics -- Galaxy: nucleus -- cosmology: dark matter -- galaxies: quasars: general

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