Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?

Autores
Sánchez Almeida, Jorge; Plastino, Ángel Ricardo; Trujillo, Ignacio
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
According to the current concordance cosmological model, dark matter (DM) particles are collisionless and produce self-gravitating structures with a central cusp, which, generally, is not observed. The observed density tends to a central plateau or core, explained within the cosmological model through the gravitational feedback of baryons on DM. This mechanism becomes inefficient when decreasing the galaxy’s stellar mass so that in the low-mass regime (M ⋆ ≪ 106 M ⊙) the energy provided by the baryons is insufficient to modify cusps into cores. Thus, if cores exist in these galaxies they have to reflect departures from the collisionless nature of DM. Measuring the DM mass distribution in these faint galaxies is extremely challenging; however, their stellar mass distribution can be characterized through deep photometry. Here we provide a way of using only the stellar mass distribution to constrain the underlying DM distribution. The so-called Eddington inversion method allows us to discard pairs of stellar distributions and DM potentials requiring (unphysical) negative distribution functions in the phase space. In particular, cored stellar density profiles are incompatible with the Navarro-Frenk-White (NFW) potential expected from collisionless DM if the velocity distribution is isotropic and the system spherically symmetric. Through a case-by-case analysis, we are able to relax these assumptions to consider anisotropic velocity distributions and systems that do not have exact cores. In general, stellar distributions with radially biased orbits are difficult to reconcile with NFW-like potentials, and cores in the baryon distribution tend to require cores in the DM distribution.
Fil: Sánchez Almeida, Jorge. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; España
Fil: Plastino, Ángel Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Noroeste de la Provincia de Buenos Aires; Argentina
Fil: Trujillo, Ignacio. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; España
Materia
Cold dark matter
Dwarf galaxies
Navarro-Frenk-White profile
Galaxies dark matter halos
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/220477
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?Sánchez Almeida, JorgePlastino, Ángel RicardoTrujillo, IgnacioCold dark matterDwarf galaxiesNavarro-Frenk-White profileGalaxies dark matter haloshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1According to the current concordance cosmological model, dark matter (DM) particles are collisionless and produce self-gravitating structures with a central cusp, which, generally, is not observed. The observed density tends to a central plateau or core, explained within the cosmological model through the gravitational feedback of baryons on DM. This mechanism becomes inefficient when decreasing the galaxy’s stellar mass so that in the low-mass regime (M ⋆ ≪ 106 M ⊙) the energy provided by the baryons is insufficient to modify cusps into cores. Thus, if cores exist in these galaxies they have to reflect departures from the collisionless nature of DM. Measuring the DM mass distribution in these faint galaxies is extremely challenging; however, their stellar mass distribution can be characterized through deep photometry. Here we provide a way of using only the stellar mass distribution to constrain the underlying DM distribution. The so-called Eddington inversion method allows us to discard pairs of stellar distributions and DM potentials requiring (unphysical) negative distribution functions in the phase space. In particular, cored stellar density profiles are incompatible with the Navarro-Frenk-White (NFW) potential expected from collisionless DM if the velocity distribution is isotropic and the system spherically symmetric. Through a case-by-case analysis, we are able to relax these assumptions to consider anisotropic velocity distributions and systems that do not have exact cores. In general, stellar distributions with radially biased orbits are difficult to reconcile with NFW-like potentials, and cores in the baryon distribution tend to require cores in the DM distribution.Fil: Sánchez Almeida, Jorge. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; EspañaFil: Plastino, Ángel Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Noroeste de la Provincia de Buenos Aires; ArgentinaFil: Trujillo, Ignacio. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; EspañaIOP Publishing2023-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/220477Sánchez Almeida, Jorge; Plastino, Ángel Ricardo; Trujillo, Ignacio; Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?; IOP Publishing; Astrophysical Journal; 954; 2; 9-2023; 1-160004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ace534info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ace534info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:05:29Zoai:ri.conicet.gov.ar:11336/220477instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:05:29.906CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
title Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
spellingShingle Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
Sánchez Almeida, Jorge
Cold dark matter
Dwarf galaxies
Navarro-Frenk-White profile
Galaxies dark matter halos
title_short Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
title_full Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
title_fullStr Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
title_full_unstemmed Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
title_sort Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?
dc.creator.none.fl_str_mv Sánchez Almeida, Jorge
Plastino, Ángel Ricardo
Trujillo, Ignacio
author Sánchez Almeida, Jorge
author_facet Sánchez Almeida, Jorge
Plastino, Ángel Ricardo
Trujillo, Ignacio
author_role author
author2 Plastino, Ángel Ricardo
Trujillo, Ignacio
author2_role author
author
dc.subject.none.fl_str_mv Cold dark matter
Dwarf galaxies
Navarro-Frenk-White profile
Galaxies dark matter halos
topic Cold dark matter
Dwarf galaxies
Navarro-Frenk-White profile
Galaxies dark matter halos
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv According to the current concordance cosmological model, dark matter (DM) particles are collisionless and produce self-gravitating structures with a central cusp, which, generally, is not observed. The observed density tends to a central plateau or core, explained within the cosmological model through the gravitational feedback of baryons on DM. This mechanism becomes inefficient when decreasing the galaxy’s stellar mass so that in the low-mass regime (M ⋆ ≪ 106 M ⊙) the energy provided by the baryons is insufficient to modify cusps into cores. Thus, if cores exist in these galaxies they have to reflect departures from the collisionless nature of DM. Measuring the DM mass distribution in these faint galaxies is extremely challenging; however, their stellar mass distribution can be characterized through deep photometry. Here we provide a way of using only the stellar mass distribution to constrain the underlying DM distribution. The so-called Eddington inversion method allows us to discard pairs of stellar distributions and DM potentials requiring (unphysical) negative distribution functions in the phase space. In particular, cored stellar density profiles are incompatible with the Navarro-Frenk-White (NFW) potential expected from collisionless DM if the velocity distribution is isotropic and the system spherically symmetric. Through a case-by-case analysis, we are able to relax these assumptions to consider anisotropic velocity distributions and systems that do not have exact cores. In general, stellar distributions with radially biased orbits are difficult to reconcile with NFW-like potentials, and cores in the baryon distribution tend to require cores in the DM distribution.
Fil: Sánchez Almeida, Jorge. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; España
Fil: Plastino, Ángel Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Noroeste de la Provincia de Buenos Aires; Argentina
Fil: Trujillo, Ignacio. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; España
description According to the current concordance cosmological model, dark matter (DM) particles are collisionless and produce self-gravitating structures with a central cusp, which, generally, is not observed. The observed density tends to a central plateau or core, explained within the cosmological model through the gravitational feedback of baryons on DM. This mechanism becomes inefficient when decreasing the galaxy’s stellar mass so that in the low-mass regime (M ⋆ ≪ 106 M ⊙) the energy provided by the baryons is insufficient to modify cusps into cores. Thus, if cores exist in these galaxies they have to reflect departures from the collisionless nature of DM. Measuring the DM mass distribution in these faint galaxies is extremely challenging; however, their stellar mass distribution can be characterized through deep photometry. Here we provide a way of using only the stellar mass distribution to constrain the underlying DM distribution. The so-called Eddington inversion method allows us to discard pairs of stellar distributions and DM potentials requiring (unphysical) negative distribution functions in the phase space. In particular, cored stellar density profiles are incompatible with the Navarro-Frenk-White (NFW) potential expected from collisionless DM if the velocity distribution is isotropic and the system spherically symmetric. Through a case-by-case analysis, we are able to relax these assumptions to consider anisotropic velocity distributions and systems that do not have exact cores. In general, stellar distributions with radially biased orbits are difficult to reconcile with NFW-like potentials, and cores in the baryon distribution tend to require cores in the DM distribution.
publishDate 2023
dc.date.none.fl_str_mv 2023-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/220477
Sánchez Almeida, Jorge; Plastino, Ángel Ricardo; Trujillo, Ignacio; Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?; IOP Publishing; Astrophysical Journal; 954; 2; 9-2023; 1-16
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/220477
identifier_str_mv Sánchez Almeida, Jorge; Plastino, Ángel Ricardo; Trujillo, Ignacio; Can Cuspy Dark-matter-dominated Halos Hold Cored Stellar Mass Distributions?; IOP Publishing; Astrophysical Journal; 954; 2; 9-2023; 1-16
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ace534
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ace534
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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