The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile

We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the galaxy. By folding in kinematic information for 25 Andromeda dSphs, more than doubling the previous sample size, we find that a sin...

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Autores: Collins, Michelle L. M., Chapman, Scott C., Rich, R. M., Ibata, Rodrigo A., Martin, Nicolas F., Irwin, Michael J., Bate, Nicholas F., Lewis, Geraint F., Peñarrubia, Jorge, Arimoto, Nobuo, Casey, Caitlin M., Ferguson, Annette M. N., Koch, Andreas, McConnachie, Alan W., Tanvir, N. R.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::b5baf046ac33061a3b81993924786596
Acceso en línea:http://hdl.handle.net/10261/399890
Access Level:acceso abierto
Palabra clave:Dark matter
Galaxies: dwarf
Galaxies: fundamental parameters
Galaxies: kinematics and dynamics
Local Group
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spelling The masses of local group dwarf spheroidal galaxies: The death of the universal mass profileCollins, Michelle L. M.Chapman, Scott C.Rich, R. M.Ibata, Rodrigo A.Martin, Nicolas F.Irwin, Michael J.Bate, Nicholas F.Lewis, Geraint F.Peñarrubia, JorgeArimoto, NobuoCasey, Caitlin M.Ferguson, Annette M. N.Koch, AndreasMcConnachie, Alan W.Tanvir, N. R.Dark matterGalaxies: dwarfGalaxies: fundamental parametersGalaxies: kinematics and dynamicsLocal GroupWe investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the galaxy. By folding in kinematic information for 25 Andromeda dSphs, more than doubling the previous sample size, we find that a singular mass profile cannot be found to fit all of the observations well. Further, the best-fit dark matter density profile measured solely for the Milky Way dSphs is marginally discrepant with that of the Andromeda dSphs (at just beyond the 1σ level), where a profile with lower maximum circular velocity, and hence mass, is preferred. The agreement is significantly better when three extreme Andromeda outliers, And XIX, XXI, and XXV, all of which have large half-light radii (gsim 600 pc) and low-velocity dispersions (σ v < 5 km s-1), are omitted from the sample. We argue that the unusual properties of these outliers are likely caused by tidal interactions with the host galaxy. © 2014. The American Astronomical SocietyWe thank the anonymous referee for helpful comments and suggestions, as well as a thorough discussion surrounding the “too big to fail” problem. R.I. gratefully acknowledges support from the Agence Nationale de la Recherche though the grant POMMME (ANR 09-BLAN-0228). G.F.L. and N.B. gratefully acknowledge financial support for an ARC Future Fellowship (FT100100268) and through the award of an ARC Discovery Project (DP110100678). A.K. thanks the Deutsche Forschungsgemeinschaft for funding from Emmy-Noether grant Ko 4161/1.Peer reviewedAmerican Astronomical SocietyAgence Nationale de la Recherche (France)German Research FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/399890reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1088/0004-637X/783/1/7Síinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::b5baf046ac33061a3b819939247865962026-05-22T06:33:51Z
dc.title.none.fl_str_mv The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
title The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
spellingShingle The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
Collins, Michelle L. M.
Dark matter
Galaxies: dwarf
Galaxies: fundamental parameters
Galaxies: kinematics and dynamics
Local Group
title_short The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
title_full The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
title_fullStr The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
title_full_unstemmed The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
title_sort The masses of local group dwarf spheroidal galaxies: The death of the universal mass profile
dc.creator.none.fl_str_mv Collins, Michelle L. M.
Chapman, Scott C.
Rich, R. M.
Ibata, Rodrigo A.
Martin, Nicolas F.
Irwin, Michael J.
Bate, Nicholas F.
Lewis, Geraint F.
Peñarrubia, Jorge
Arimoto, Nobuo
Casey, Caitlin M.
Ferguson, Annette M. N.
Koch, Andreas
McConnachie, Alan W.
Tanvir, N. R.
author Collins, Michelle L. M.
author_facet Collins, Michelle L. M.
Chapman, Scott C.
Rich, R. M.
Ibata, Rodrigo A.
Martin, Nicolas F.
Irwin, Michael J.
Bate, Nicholas F.
Lewis, Geraint F.
Peñarrubia, Jorge
Arimoto, Nobuo
Casey, Caitlin M.
Ferguson, Annette M. N.
Koch, Andreas
McConnachie, Alan W.
Tanvir, N. R.
author_role author
author2 Chapman, Scott C.
Rich, R. M.
Ibata, Rodrigo A.
Martin, Nicolas F.
Irwin, Michael J.
Bate, Nicholas F.
Lewis, Geraint F.
Peñarrubia, Jorge
Arimoto, Nobuo
Casey, Caitlin M.
Ferguson, Annette M. N.
Koch, Andreas
McConnachie, Alan W.
Tanvir, N. R.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Agence Nationale de la Recherche (France)
German Research Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Dark matter
Galaxies: dwarf
Galaxies: fundamental parameters
Galaxies: kinematics and dynamics
Local Group
topic Dark matter
Galaxies: dwarf
Galaxies: fundamental parameters
Galaxies: kinematics and dynamics
Local Group
description We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the galaxy. By folding in kinematic information for 25 Andromeda dSphs, more than doubling the previous sample size, we find that a singular mass profile cannot be found to fit all of the observations well. Further, the best-fit dark matter density profile measured solely for the Milky Way dSphs is marginally discrepant with that of the Andromeda dSphs (at just beyond the 1σ level), where a profile with lower maximum circular velocity, and hence mass, is preferred. The agreement is significantly better when three extreme Andromeda outliers, And XIX, XXI, and XXV, all of which have large half-light radii (gsim 600 pc) and low-velocity dispersions (σ v < 5 km s-1), are omitted from the sample. We argue that the unusual properties of these outliers are likely caused by tidal interactions with the host galaxy. © 2014. The American Astronomical Society
publishDate 2014
dc.date.none.fl_str_mv 2014
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/399890
url http://hdl.handle.net/10261/399890
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1088/0004-637X/783/1/7
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
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
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score 15.812455

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