Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)

Breaks in the radial luminosity profiles of galaxies have until now been mostly studied averaged over disks. Here, we study separately breaks in thin and thick disks in 70 edge-on galaxies using imaging from the Spitzer Survey of Stellar Structure in Galaxies. We built luminosity profiles of the thi...

Descripción completa

Detalles Bibliográficos
Autor: Gil De Paz, Armando
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44847
Acceso en línea:https://hdl.handle.net/20.500.14352/44847
Access Level:acceso abierto
Palabra clave:52
Surface-brightness profiles
Star-formation law
Spiral galaxies
Galactic disks
Dark-matter
Lenticular galaxies
Neutral hydrogen
Space-telescope
Barred galaxies
S0 galaxies
Astrofísica
Astronomía (Física)
id ES_aa42ca3d25c48cd9c166bdacb91d3524
oai_identifier_str oai:docta.ucm.es:20.500.14352/44847
network_acronym_str ES
network_name_str España
repository_id_str
spelling Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)Gil De Paz, Armando52Surface-brightness profilesStar-formation lawSpiral galaxiesGalactic disksDark-matterLenticular galaxiesNeutral hydrogenSpace-telescopeBarred galaxiesS0 galaxiesAstrofísicaAstronomía (Física)Breaks in the radial luminosity profiles of galaxies have until now been mostly studied averaged over disks. Here, we study separately breaks in thin and thick disks in 70 edge-on galaxies using imaging from the Spitzer Survey of Stellar Structure in Galaxies. We built luminosity profiles of the thin and thick disks parallel to midplanes and we found that thin disks often truncate (77%). Thick disks truncate less often (31%), but when they do, their break radius is comparable with that in the thin disk. This suggests either two different truncation mechanisms—one of dynamical origin affecting both disks simultaneously and another one only affecting the thin disk—or a single mechanism that creates a truncation in one disk or in both depending on some galaxy property. Thin disks apparently antitruncate in around 40% of galaxies. However, in many cases, these antitruncations are an artifact caused by the superposition of a thin disk and a thick disk, with the latter having a longer scale length. We estimate the real thin disk antitruncation fraction to be less than 15%. We found that the ratio of the thick and thin stellar disk mass is roughly constant (0.2 < M_T /M_t < 0.7) for circular velocities ν_c > 120 km s^–1, but becomes much larger at smaller velocities. We hypothesize that this is due to a combination of a high efficiency of supernova feedback and a slower dynamical evolution in lower-mass galaxies causing stellar thin disks to be younger and less massive than in higher-mass galaxies.American Astronomical SocietyUniversidad Complutense de Madrid20122012-11-1020122012-11-10journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44847reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/448472026-06-02T12:44:21Z
dc.title.none.fl_str_mv Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
title Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
spellingShingle Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
Gil De Paz, Armando
52
Surface-brightness profiles
Star-formation law
Spiral galaxies
Galactic disks
Dark-matter
Lenticular galaxies
Neutral hydrogen
Space-telescope
Barred galaxies
S0 galaxies
Astrofísica
Astronomía (Física)
title_short Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
title_full Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
title_fullStr Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
title_full_unstemmed Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
title_sort Breaks in thin and thick disks of edge-on galaxies imaged in the Spitzer survey of stellar structure in galaxies (S^4G)
dc.creator.none.fl_str_mv Gil De Paz, Armando
author Gil De Paz, Armando
author_facet Gil De Paz, Armando
author_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Surface-brightness profiles
Star-formation law
Spiral galaxies
Galactic disks
Dark-matter
Lenticular galaxies
Neutral hydrogen
Space-telescope
Barred galaxies
S0 galaxies
Astrofísica
Astronomía (Física)
topic 52
Surface-brightness profiles
Star-formation law
Spiral galaxies
Galactic disks
Dark-matter
Lenticular galaxies
Neutral hydrogen
Space-telescope
Barred galaxies
S0 galaxies
Astrofísica
Astronomía (Física)
description Breaks in the radial luminosity profiles of galaxies have until now been mostly studied averaged over disks. Here, we study separately breaks in thin and thick disks in 70 edge-on galaxies using imaging from the Spitzer Survey of Stellar Structure in Galaxies. We built luminosity profiles of the thin and thick disks parallel to midplanes and we found that thin disks often truncate (77%). Thick disks truncate less often (31%), but when they do, their break radius is comparable with that in the thin disk. This suggests either two different truncation mechanisms—one of dynamical origin affecting both disks simultaneously and another one only affecting the thin disk—or a single mechanism that creates a truncation in one disk or in both depending on some galaxy property. Thin disks apparently antitruncate in around 40% of galaxies. However, in many cases, these antitruncations are an artifact caused by the superposition of a thin disk and a thick disk, with the latter having a longer scale length. We estimate the real thin disk antitruncation fraction to be less than 15%. We found that the ratio of the thick and thin stellar disk mass is roughly constant (0.2 < M_T /M_t < 0.7) for circular velocities ν_c > 120 km s^–1, but becomes much larger at smaller velocities. We hypothesize that this is due to a combination of a high efficiency of supernova feedback and a slower dynamical evolution in lower-mass galaxies causing stellar thin disks to be younger and less massive than in higher-mass galaxies.
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-11-10
2012
2012-11-10
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/44847
url https://hdl.handle.net/20.500.14352/44847
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 American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869416147595558912
score 15.301603

Similares en LA Referencia