Growth of galactic bulges by mergers - II. Low-density satellites

[EN]Context. Satellite accretion events have been invoked for mimicking the internal secular evolutionary processes of bulge growth. However, N-body simulations of satellite accretions have paid little attention to the evolution of bulge photometric parameters, to the processes driving this evolutio...

ver descrição completa

Detalhes bibliográficos
Autores: Eliche-Moral, M. Carmen, Balcells, Marc, Aguerri, J.A.L., González-García, A. César
Formato: artículo
Fecha de publicación:2006
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/75137
Acesso em linha:http://hdl.handle.net/10261/75137
Access Level:acceso abierto
Palavra-chave:Galaxies: evolution
Galaxies: interactions
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: structure
Methods: N-body simulations
Incipit
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
id ES_7ebd5a2d56fc4be97422b416624f1644
oai_identifier_str oai:digital.csic.es:10261/75137
network_acronym_str ES
network_name_str España
repository_id_str
spelling Growth of galactic bulges by mergers - II. Low-density satellitesEliche-Moral, M. CarmenBalcells, MarcAguerri, J.A.L.González-García, A. CésarGalaxies: evolutionGalaxies: interactionsGalaxies: kinematics and dynamicsGalaxies: nucleiGalaxies: structureMethods: N-body simulationsIncipitInstituto de Ciencias del PatrimonioInstitute of Heritage Sciences[EN]Context. Satellite accretion events have been invoked for mimicking the internal secular evolutionary processes of bulge growth. However, N-body simulations of satellite accretions have paid little attention to the evolution of bulge photometric parameters, to the processes driving this evolution, and to the consistency of this evolution with observations. Aims. We want to investigate whether satellite accretions indeed drive the growth of bulges, and whether they are consistent with global scaling relations of bulges and discs. Methods. We perform N-body models of the accretion of satellites onto disc galaxies. A Tully-Fisher (M ∝ Vα TF rot ) scaling between primary and satellite ensures that density ratios, critical to the outcome of the accretion, are realistic. We carry out a full structural, kinematic and dynamical analysis of the evolution of the bulge mass, bulge central concentration, and bulge-to-disc scaling relations. Results. The remnants of the accretion have bulge-disc structure. Both the bulge-to-disc ratio (B/D) and the Sérsic index (n) of the remnant bulge increase as a result of the accretion, with moderate final bulge Sérsic indices: n = 1.0 to 1.9. Bulge growth occurs no matter the fate of the secondary, which fully disrupts for αTF = 3 and partially survives to the remnant center for αTF = 3.5 or 4. Global structural parameters evolve following trends similar to observations. We show that the dominant mechanism for bulge growth is the inward flow of material from the disc to the bulge region during the satellite decay. Conclusions. The models confirm that the growth of the bulge out of disc material, a central ingredient of secular evolution models,may be triggered externally through satellite accretion.Peer reviewedEDP Sciences201320132006info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/75137reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1051/0004-6361:20065394info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/751372026-05-22T06:33:51Z
dc.title.none.fl_str_mv Growth of galactic bulges by mergers - II. Low-density satellites
title Growth of galactic bulges by mergers - II. Low-density satellites
spellingShingle Growth of galactic bulges by mergers - II. Low-density satellites
Eliche-Moral, M. Carmen
Galaxies: evolution
Galaxies: interactions
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: structure
Methods: N-body simulations
Incipit
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
title_short Growth of galactic bulges by mergers - II. Low-density satellites
title_full Growth of galactic bulges by mergers - II. Low-density satellites
title_fullStr Growth of galactic bulges by mergers - II. Low-density satellites
title_full_unstemmed Growth of galactic bulges by mergers - II. Low-density satellites
title_sort Growth of galactic bulges by mergers - II. Low-density satellites
dc.creator.none.fl_str_mv Eliche-Moral, M. Carmen
Balcells, Marc
Aguerri, J.A.L.
González-García, A. César
author Eliche-Moral, M. Carmen
author_facet Eliche-Moral, M. Carmen
Balcells, Marc
Aguerri, J.A.L.
González-García, A. César
author_role author
author2 Balcells, Marc
Aguerri, J.A.L.
González-García, A. César
author2_role author
author
author
dc.subject.none.fl_str_mv Galaxies: evolution
Galaxies: interactions
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: structure
Methods: N-body simulations
Incipit
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
topic Galaxies: evolution
Galaxies: interactions
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: structure
Methods: N-body simulations
Incipit
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
description [EN]Context. Satellite accretion events have been invoked for mimicking the internal secular evolutionary processes of bulge growth. However, N-body simulations of satellite accretions have paid little attention to the evolution of bulge photometric parameters, to the processes driving this evolution, and to the consistency of this evolution with observations. Aims. We want to investigate whether satellite accretions indeed drive the growth of bulges, and whether they are consistent with global scaling relations of bulges and discs. Methods. We perform N-body models of the accretion of satellites onto disc galaxies. A Tully-Fisher (M ∝ Vα TF rot ) scaling between primary and satellite ensures that density ratios, critical to the outcome of the accretion, are realistic. We carry out a full structural, kinematic and dynamical analysis of the evolution of the bulge mass, bulge central concentration, and bulge-to-disc scaling relations. Results. The remnants of the accretion have bulge-disc structure. Both the bulge-to-disc ratio (B/D) and the Sérsic index (n) of the remnant bulge increase as a result of the accretion, with moderate final bulge Sérsic indices: n = 1.0 to 1.9. Bulge growth occurs no matter the fate of the secondary, which fully disrupts for αTF = 3 and partially survives to the remnant center for αTF = 3.5 or 4. Global structural parameters evolve following trends similar to observations. We show that the dominant mechanism for bulge growth is the inward flow of material from the disc to the bulge region during the satellite decay. Conclusions. The models confirm that the growth of the bulge out of disc material, a central ingredient of secular evolution models,may be triggered externally through satellite accretion.
publishDate 2006
dc.date.none.fl_str_mv 2006
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/75137
url http://hdl.handle.net/10261/75137
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1051/0004-6361:20065394
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869411772199337984
score 15,812429

Registos relacionados