Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies

Using a representative sample of 14 star-forming dwarf galaxies in the local Universe, we show the existence of a spaxel-to-spaxel anticorrelation between the index N2≡log([N II]λ6583/Hα) and the Hα flux. These two quantities are commonly employed as proxies for gas-phase metallicity and star format...

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Detalles Bibliográficos
Autores: Sánchez Almeida, J., Caon, N., Muñoz-Tuñón, C., Filho, M., Cerviño, Miguel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/206717
Acceso en línea:http://hdl.handle.net/10261/206717
Access Level:acceso abierto
Palabra clave:Galaxies: abundances
Galaxies: dwarf
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
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spelling Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxiesSánchez Almeida, J.Caon, N.Muñoz-Tuñón, C.Filho, M.Cerviño, MiguelGalaxies: abundancesGalaxies: dwarfGalaxies: evolutionGalaxies: irregularGalaxies: star formationUsing a representative sample of 14 star-forming dwarf galaxies in the local Universe, we show the existence of a spaxel-to-spaxel anticorrelation between the index N2≡log([N II]λ6583/Hα) and the Hα flux. These two quantities are commonly employed as proxies for gas-phase metallicity and star formation rate (SFR), respectively. Thus, the observed N2 to Hα relation may reflect the existence of an anticorrelation between the metallicity of the gas forming stars and the SFR it induces. Such an anticorrelation is to be expected if variable external metal-poor gas fuels the star-formation process. Alternatively, it can result from the contamination of the star-forming gas by stellar winds and SNe, provided that intense outflows drive most of the metals out of the star-forming regions. We also explore the possibility that the observed anticorrelation is due to variations in the physical conditions of the emitting gas, other than metallicity. Using alternative methods to compute metallicity, as well as previous observations of HII regions and photoionization models, we conclude that this possibility is unlikely. The radial gradient of metallicity characterizing disc galaxies does not produce the correlation either.© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.We thank Sebastian Sanchez for providing some of the data used in Section 4.2, Enrique Perez-Montero for help with the use of HIIC, and Matteo Miluzio for discussions and support during the early stages of the analysis. We also thank an anonymous referee whose comments help us improving the reliability of our argumentation. MF gratefully acknowledges the financial support of the Fundacao para a Ciencia e Tecnologia (FCT - Portugal), through the research grant SFRH/BPD/107801/2015. This work has been partly funded by the Spanish Ministry of Economy and Competitiveness, projects Estallidos AYA2013-47742-C04-02-P and AYA2016-79724-C4-2-P, as well as AYA2014-58861-C3-1-P.Oxford University PressFundação para a Ciência e a Tecnologia (Portugal)Ministerio de Economía y Competitividad (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2020202020182020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/206717reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2013-47742-C04-02-Pinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-79724-C4-2-Pinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2014-58861-C3-1-Phttp://dx.doi.org/10.1093/mnras/sty510Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2067172026-05-22T06:33:51Z
dc.title.none.fl_str_mv Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
title Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
spellingShingle Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
Sánchez Almeida, J.
Galaxies: abundances
Galaxies: dwarf
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
title_short Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
title_full Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
title_fullStr Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
title_full_unstemmed Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
title_sort Local anticorrelation between star formation rate and gas-phase metallicity in disc galaxies
dc.creator.none.fl_str_mv Sánchez Almeida, J.
Caon, N.
Muñoz-Tuñón, C.
Filho, M.
Cerviño, Miguel
author Sánchez Almeida, J.
author_facet Sánchez Almeida, J.
Caon, N.
Muñoz-Tuñón, C.
Filho, M.
Cerviño, Miguel
author_role author
author2 Caon, N.
Muñoz-Tuñón, C.
Filho, M.
Cerviño, Miguel
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Fundação para a Ciência e a Tecnologia (Portugal)
Ministerio de Economía y Competitividad (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: abundances
Galaxies: dwarf
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
topic Galaxies: abundances
Galaxies: dwarf
Galaxies: evolution
Galaxies: irregular
Galaxies: star formation
description Using a representative sample of 14 star-forming dwarf galaxies in the local Universe, we show the existence of a spaxel-to-spaxel anticorrelation between the index N2≡log([N II]λ6583/Hα) and the Hα flux. These two quantities are commonly employed as proxies for gas-phase metallicity and star formation rate (SFR), respectively. Thus, the observed N2 to Hα relation may reflect the existence of an anticorrelation between the metallicity of the gas forming stars and the SFR it induces. Such an anticorrelation is to be expected if variable external metal-poor gas fuels the star-formation process. Alternatively, it can result from the contamination of the star-forming gas by stellar winds and SNe, provided that intense outflows drive most of the metals out of the star-forming regions. We also explore the possibility that the observed anticorrelation is due to variations in the physical conditions of the emitting gas, other than metallicity. Using alternative methods to compute metallicity, as well as previous observations of HII regions and photoionization models, we conclude that this possibility is unlikely. The radial gradient of metallicity characterizing disc galaxies does not produce the correlation either.© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
publishDate 2018
dc.date.none.fl_str_mv 2018
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/206717
url http://hdl.handle.net/10261/206717
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2013-47742-C04-02-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-79724-C4-2-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2014-58861-C3-1-P
http://dx.doi.org/10.1093/mnras/sty510
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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
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