Pressure from dark matter annihilation and the rotation curve of spiral galaxies

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 RAS ©2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Detalles Bibliográficos
Autores: Wechakama, M., Ascasibar Sequeiros, Yago
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/666939
Acceso en línea:http://hdl.handle.net/10486/666939
https://dx.doi.org/10.1111/j.1365-2966.2011.18275.x
Access Level:acceso abierto
Palabra clave:Astroparticle physics
Dark matter
Galaxies: haloes
Galaxies: kinematics and dynamics
Física
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spelling Pressure from dark matter annihilation and the rotation curve of spiral galaxiesWechakama, M.Ascasibar Sequeiros, YagoAstroparticle physicsDark matterGalaxies: haloesGalaxies: kinematics and dynamicsFísicaThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 RAS ©2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.The rotation curves of spiral galaxies are one of the basic predictions of the cold dark matter paradigm, and their shape in the innermost regions has been hotly debated over the last decades. The present work shows that dark matter annihilation into electron-positron pairs may affect the observed rotation curve by a significant amount. We adopt a model-independent approach, where all the electrons and positrons are injected with the same initial energy E0~mdmc2 in the range from 1 MeV to 1 TeV and the injection rate is constrained by INTEGRAL, Fermi and HESS data. The pressure of the relativistic electron-positron gas is determined by solving the diffusion-loss equation, considering inverse Compton scattering, synchrotron radiation, Coulomb collisions, bremsstrahlung and ionization. For values of the gas density and magnetic field that are representative of the Milky Way, it is estimated that pressure gradients are strong enough to balance gravity in the central parts if E0 < 1GeV. The exact value depends somewhat on the astrophysical parameters, and it changes dramatically with the slope of the dark matter density profile. For very steep slopes, as those expected from adiabatic contraction, the rotation curves of spiral galaxies would be affected on ~kpc scales for most values of E0. By comparing the predicted rotation curves with observations of dwarf and low surface brightness galaxies, we show that the pressure from dark matter annihilation may improve the agreement between theory and observations in some cases, but it also imposes severe constraints on the model parameters (most notably, the inner slope of halo density profile, as well as the mass and the annihilation cross-section of dark matter particles into electron-positron pairs)This work has been funded by DFG Research Grant AS 312/1-1 (Germany).YA also acknowledges support from project AYA 2007-67965-C03-03 (MEC, Spain)Royal Astronomical SocietyOxford University PressDepartamento de Física TeóricaFacultad de Ciencias20112011-05-01research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/666939https://dx.doi.org/10.1111/j.1365-2966.2011.18275.xreponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6669392026-06-23T12:46:27Z
dc.title.none.fl_str_mv Pressure from dark matter annihilation and the rotation curve of spiral galaxies
title Pressure from dark matter annihilation and the rotation curve of spiral galaxies
spellingShingle Pressure from dark matter annihilation and the rotation curve of spiral galaxies
Wechakama, M.
Astroparticle physics
Dark matter
Galaxies: haloes
Galaxies: kinematics and dynamics
Física
title_short Pressure from dark matter annihilation and the rotation curve of spiral galaxies
title_full Pressure from dark matter annihilation and the rotation curve of spiral galaxies
title_fullStr Pressure from dark matter annihilation and the rotation curve of spiral galaxies
title_full_unstemmed Pressure from dark matter annihilation and the rotation curve of spiral galaxies
title_sort Pressure from dark matter annihilation and the rotation curve of spiral galaxies
dc.creator.none.fl_str_mv Wechakama, M.
Ascasibar Sequeiros, Yago
author Wechakama, M.
author_facet Wechakama, M.
Ascasibar Sequeiros, Yago
author_role author
author2 Ascasibar Sequeiros, Yago
author2_role author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Astroparticle physics
Dark matter
Galaxies: haloes
Galaxies: kinematics and dynamics
Física
topic Astroparticle physics
Dark matter
Galaxies: haloes
Galaxies: kinematics and dynamics
Física
description This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 RAS ©2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-05-01
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/666939
https://dx.doi.org/10.1111/j.1365-2966.2011.18275.x
url http://hdl.handle.net/10486/666939
https://dx.doi.org/10.1111/j.1365-2966.2011.18275.x
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Royal Astronomical Society
Oxford University Press
publisher.none.fl_str_mv Royal Astronomical Society
Oxford University Press
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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