The halo shape and evolution of polar disc galaxies

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2012 RAS © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Detalles Bibliográficos
Autores: Snaith, O. N., Gibson, B. K., Brook, C. B., Knebe, Alexander, Thacker, R. J., Quinn, T. R., Governato, F., Tissera, P. B.
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/667212
Acceso en línea:http://hdl.handle.net/10486/667212
https://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
Access Level:acceso abierto
Palabra clave:Galaxies: evolution
Galaxies: formation
Galaxies: haloes
Galaxies: interactions
Galaxies: structure
Física
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spelling The halo shape and evolution of polar disc galaxiesSnaith, O. N.Gibson, B. K.Brook, C. B.Knebe, AlexanderThacker, R. J.Quinn, T. R.Governato, F.Tissera, P. B.Galaxies: evolutionGalaxies: formationGalaxies: haloesGalaxies: interactionsGalaxies: structureFísicaThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2012 RAS © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.We examine the properties and evolution of a simulated polar disc galaxy. This galaxy is composed of two orthogonal discs, one of which contains old stars (old stellar disc) and the other both younger stars and cold gas (polar disc). By exploring the shape of the inner region of the dark matter halo, we are able to confirm that the halo shape is an oblate ellipsoid flattened in the direction of the polar disc. We also note that there is a twist in the shape profile, where the innermost 3kpc of the halo flattens in the direction perpendicular to the old disc and then aligns with the polar disc out until the virial radius. This result is then compared to the halo shape inferred from the circular velocities of the two discs. We also use the temporal information of the simulation to track the system's evolution and identify the processes which give rise to this unusual galaxy type. We confirm the proposal that the polar disc galaxy is the result of the last major merger, where the angular moment of the interaction is orthogonal to the angle of the infalling gas. This merger is followed by the resumption of coherent gas infall. We emphasize that the disc is rapidly restored after the major merger and that after this event the galaxy begins to tilt. A significant proportion of the infalling gas comes from filaments. This infalling gas from the filament gives the gas its angular momentum, and, in the case of the polar disc galaxy, the direction of the gas filament does not change before or after the last major mergerONS acknowledges the support of STFC through its PhD Studentship programme (PPA/S/S/2006/4526) and a fellowship from the European Commissions Framework Programme 7, through the Marie Curie Initial Training Network CosmoComp (PITN-GA-2009-238356).BKG, CBB, RJT and AK acknowledge the support of the UK’s Science & Technology Facilities Council (ST/F002432/1, ST/G003025/1).AK further acknowledges support by the SpanishMinisterio de Ciencia e Innovación (MICINN) in Spain through the Ramon y Cajal programme as well as the grants AYA 2009-13875-C03-02, AYA2009- 12792-C03-03, CSD2009-00064 and CAM S2009/ESP-1496. We thank the DEISA consortium, co-funded through EU FP6 project RI-031513 and the FP7 project RI-222919, for supportwithin theDEISA Extreme Computing InitiativeOxford University PressRoyal Astronomical SocietyDepartamento de Física TeóricaFacultad de Ciencias20122012-09-21research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/667212https://dx.doi.org/10.1111/j.1365-2966.2012.21518.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:10486/6672122026-06-23T12:46:27Z
dc.title.none.fl_str_mv The halo shape and evolution of polar disc galaxies
title The halo shape and evolution of polar disc galaxies
spellingShingle The halo shape and evolution of polar disc galaxies
Snaith, O. N.
Galaxies: evolution
Galaxies: formation
Galaxies: haloes
Galaxies: interactions
Galaxies: structure
Física
title_short The halo shape and evolution of polar disc galaxies
title_full The halo shape and evolution of polar disc galaxies
title_fullStr The halo shape and evolution of polar disc galaxies
title_full_unstemmed The halo shape and evolution of polar disc galaxies
title_sort The halo shape and evolution of polar disc galaxies
dc.creator.none.fl_str_mv Snaith, O. N.
Gibson, B. K.
Brook, C. B.
Knebe, Alexander
Thacker, R. J.
Quinn, T. R.
Governato, F.
Tissera, P. B.
author Snaith, O. N.
author_facet Snaith, O. N.
Gibson, B. K.
Brook, C. B.
Knebe, Alexander
Thacker, R. J.
Quinn, T. R.
Governato, F.
Tissera, P. B.
author_role author
author2 Gibson, B. K.
Brook, C. B.
Knebe, Alexander
Thacker, R. J.
Quinn, T. R.
Governato, F.
Tissera, P. B.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Galaxies: evolution
Galaxies: formation
Galaxies: haloes
Galaxies: interactions
Galaxies: structure
Física
topic Galaxies: evolution
Galaxies: formation
Galaxies: haloes
Galaxies: interactions
Galaxies: structure
Física
description This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2012 RAS © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-09-21
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/10486/667212
https://dx.doi.org/10.1111/j.1365-2966.2012.21518.x
url http://hdl.handle.net/10486/667212
https://dx.doi.org/10.1111/j.1365-2966.2012.21518.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 Oxford University Press
Royal Astronomical Society
publisher.none.fl_str_mv Oxford University Press
Royal Astronomical Society
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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