The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo

Autores
Camacho, J.; Torres, S.; Isern, J.; Althaus, Leandro Gabriel; García Berro, Enrique
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However, several constraints on the role played by regular carbon-oxygen white dwarfs exist. Aims. Massive white dwarfs are thought to be made of a mixture of oxygen and neon. Correspondingly, their cooling rate is larger than those of typical carbon-oxygen white dwarfs and they fade to invisibility in short timescales. Consequently, they constitute a good candidate for explaining the microlensing results. Methods. Here, we examine in detail this hypothesis by using the most recent and up-to-date cooling tracks for massive white dwarfs and a Monte Carlo simulator which takes into account the most relevant Galactic inputs. Results. We find that oxygen-neon white dwarfs cannot account for a substantial fraction of the microlensing depth towards the LMC, independently of the adopted initial mass function, although some microlensing events could be due to oxygen-neon white dwarfs. Conclusions. The white dwarf population contributes at most a 5% to the mass of the Galactic halo.
Fil: Camacho, J.. Universidad Politécnica de Catalunya; España
Fil: Torres, S.. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: Isern, J.. Institute for Space Studies of Catalonia; España
Fil: Althaus, Leandro Gabriel. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Materia
White dwarfs
Luminosity function
Mass function
Galaxy
Galaxy halo
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/41957
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic haloCamacho, J.Torres, S.Isern, J.Althaus, Leandro GabrielGarcía Berro, EnriqueWhite dwarfsLuminosity functionMass functionGalaxyGalaxy halohttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However, several constraints on the role played by regular carbon-oxygen white dwarfs exist. Aims. Massive white dwarfs are thought to be made of a mixture of oxygen and neon. Correspondingly, their cooling rate is larger than those of typical carbon-oxygen white dwarfs and they fade to invisibility in short timescales. Consequently, they constitute a good candidate for explaining the microlensing results. Methods. Here, we examine in detail this hypothesis by using the most recent and up-to-date cooling tracks for massive white dwarfs and a Monte Carlo simulator which takes into account the most relevant Galactic inputs. Results. We find that oxygen-neon white dwarfs cannot account for a substantial fraction of the microlensing depth towards the LMC, independently of the adopted initial mass function, although some microlensing events could be due to oxygen-neon white dwarfs. Conclusions. The white dwarf population contributes at most a 5% to the mass of the Galactic halo.Fil: Camacho, J.. Universidad Politécnica de Catalunya; EspañaFil: Torres, S.. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; EspañaFil: Isern, J.. Institute for Space Studies of Catalonia; EspañaFil: Althaus, Leandro Gabriel. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; EspañaEDP Sciences2007-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/41957Camacho, J.; Torres, S.; Isern, J.; Althaus, Leandro Gabriel; García Berro, Enrique; The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo; EDP Sciences; Astronomy and Astrophysics; 471; 1; 12-2007; 151-1580004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20077714info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/31/aa7714-07/aa7714-07.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:05:24Zoai:ri.conicet.gov.ar:11336/41957instacron: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:34982025-09-29 10:05:24.891CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
title The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
spellingShingle The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
Camacho, J.
White dwarfs
Luminosity function
Mass function
Galaxy
Galaxy halo
title_short The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
title_full The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
title_fullStr The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
title_full_unstemmed The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
title_sort The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
dc.creator.none.fl_str_mv Camacho, J.
Torres, S.
Isern, J.
Althaus, Leandro Gabriel
García Berro, Enrique
author Camacho, J.
author_facet Camacho, J.
Torres, S.
Isern, J.
Althaus, Leandro Gabriel
García Berro, Enrique
author_role author
author2 Torres, S.
Isern, J.
Althaus, Leandro Gabriel
García Berro, Enrique
author2_role author
author
author
author
dc.subject.none.fl_str_mv White dwarfs
Luminosity function
Mass function
Galaxy
Galaxy halo
topic White dwarfs
Luminosity function
Mass function
Galaxy
Galaxy halo
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However, several constraints on the role played by regular carbon-oxygen white dwarfs exist. Aims. Massive white dwarfs are thought to be made of a mixture of oxygen and neon. Correspondingly, their cooling rate is larger than those of typical carbon-oxygen white dwarfs and they fade to invisibility in short timescales. Consequently, they constitute a good candidate for explaining the microlensing results. Methods. Here, we examine in detail this hypothesis by using the most recent and up-to-date cooling tracks for massive white dwarfs and a Monte Carlo simulator which takes into account the most relevant Galactic inputs. Results. We find that oxygen-neon white dwarfs cannot account for a substantial fraction of the microlensing depth towards the LMC, independently of the adopted initial mass function, although some microlensing events could be due to oxygen-neon white dwarfs. Conclusions. The white dwarf population contributes at most a 5% to the mass of the Galactic halo.
Fil: Camacho, J.. Universidad Politécnica de Catalunya; España
Fil: Torres, S.. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: Isern, J.. Institute for Space Studies of Catalonia; España
Fil: Althaus, Leandro Gabriel. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Institute for Space Studies of Catalonia; España
description Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However, several constraints on the role played by regular carbon-oxygen white dwarfs exist. Aims. Massive white dwarfs are thought to be made of a mixture of oxygen and neon. Correspondingly, their cooling rate is larger than those of typical carbon-oxygen white dwarfs and they fade to invisibility in short timescales. Consequently, they constitute a good candidate for explaining the microlensing results. Methods. Here, we examine in detail this hypothesis by using the most recent and up-to-date cooling tracks for massive white dwarfs and a Monte Carlo simulator which takes into account the most relevant Galactic inputs. Results. We find that oxygen-neon white dwarfs cannot account for a substantial fraction of the microlensing depth towards the LMC, independently of the adopted initial mass function, although some microlensing events could be due to oxygen-neon white dwarfs. Conclusions. The white dwarf population contributes at most a 5% to the mass of the Galactic halo.
publishDate 2007
dc.date.none.fl_str_mv 2007-12
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/11336/41957
Camacho, J.; Torres, S.; Isern, J.; Althaus, Leandro Gabriel; García Berro, Enrique; The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo; EDP Sciences; Astronomy and Astrophysics; 471; 1; 12-2007; 151-158
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/41957
identifier_str_mv Camacho, J.; Torres, S.; Isern, J.; Althaus, Leandro Gabriel; García Berro, Enrique; The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo; EDP Sciences; Astronomy and Astrophysics; 471; 1; 12-2007; 151-158
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20077714
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/31/aa7714-07/aa7714-07.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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 13.070432

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