Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations

Detalhes bibliográficos
Autor(a) principal: Dors Júnior, Oli Luiz
Data de Publicação: 2008
Outros Autores: Storchi-Bergmann, Thaisa, Riffel, Rogemar André, Schmidt, Alex Andre
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/99258
Resumo: Aims. We derive the age and metallicity of circumnuclear star formation regions (CNSFRs) located in the spiral galaxies NGC6951 and NGC1097 and investigate the cause of the very low equivalent widths of emission lines found for these regions. Methods. We used optical two-dimensional spectroscopic data obtained with Gemini GMOS-IFUs and a grid of photoionization models to derive the the metallicities and ages of CNSFRs. Results. We find star formation rates in the range 0.002–0.14 Mʘ yr-ˡ and oxygen abundance of 12 + log(O/H) ≈ 8.8 dex, similar to those of most metal-rich nebulae located in the inner region of galactic disks. Conclusions. We conclude that the very low emission-line equivalent widths observed in CNSFRs are caused by the “contamination” of the continuum by (1) contribution of the underlying bulge continuum combined with (2) contribution from previous episodes of star formation at the CNSFRs.
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spelling Dors Júnior, Oli LuizStorchi-Bergmann, ThaisaRiffel, Rogemar AndréSchmidt, Alex Andre2014-08-08T02:06:58Z20080004-6361http://hdl.handle.net/10183/99258000766517Aims. We derive the age and metallicity of circumnuclear star formation regions (CNSFRs) located in the spiral galaxies NGC6951 and NGC1097 and investigate the cause of the very low equivalent widths of emission lines found for these regions. Methods. We used optical two-dimensional spectroscopic data obtained with Gemini GMOS-IFUs and a grid of photoionization models to derive the the metallicities and ages of CNSFRs. Results. We find star formation rates in the range 0.002–0.14 Mʘ yr-ˡ and oxygen abundance of 12 + log(O/H) ≈ 8.8 dex, similar to those of most metal-rich nebulae located in the inner region of galactic disks. Conclusions. We conclude that the very low emission-line equivalent widths observed in CNSFRs are caused by the “contamination” of the continuum by (1) contribution of the underlying bulge continuum combined with (2) contribution from previous episodes of star formation at the CNSFRs.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 482, no. 1 (Apr. 2008), p. 59-65Espectros astronômicosNebulosasGalaxias espiraisGalaxias StarburstGalaxy: abundancesISM: abundancesISM: HII regionsISM: evolutionGalaxy: bulgeAges and metallicities of circumnuclear star formation regions from Gemini IFU observationsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000766517.pdf000766517.pdfTexto completo (inglês)application/pdf294886http://www.lume.ufrgs.br/bitstream/10183/99258/1/000766517.pdf4b8f32c38dbb00f22a4c6eb7aeb6ac38MD51TEXT000766517.pdf.txt000766517.pdf.txtExtracted Texttext/plain37415http://www.lume.ufrgs.br/bitstream/10183/99258/2/000766517.pdf.txta2048e8df352bd3b43834bb208ff1f8fMD52THUMBNAIL000766517.pdf.jpg000766517.pdf.jpgGenerated Thumbnailimage/jpeg2002http://www.lume.ufrgs.br/bitstream/10183/99258/3/000766517.pdf.jpg61fefa6ebb68cfde3c2ea3b1c206b191MD5310183/992582018-10-22 08:32:52.717oai:www.lume.ufrgs.br:10183/99258Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-22T11:32:52Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
title Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
spellingShingle Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
Dors Júnior, Oli Luiz
Espectros astronômicos
Nebulosas
Galaxias espirais
Galaxias Starburst
Galaxy: abundances
ISM: abundances
ISM: HII regions
ISM: evolution
Galaxy: bulge
title_short Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
title_full Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
title_fullStr Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
title_full_unstemmed Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
title_sort Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
author Dors Júnior, Oli Luiz
author_facet Dors Júnior, Oli Luiz
Storchi-Bergmann, Thaisa
Riffel, Rogemar André
Schmidt, Alex Andre
author_role author
author2 Storchi-Bergmann, Thaisa
Riffel, Rogemar André
Schmidt, Alex Andre
author2_role author
author
author
dc.contributor.author.fl_str_mv Dors Júnior, Oli Luiz
Storchi-Bergmann, Thaisa
Riffel, Rogemar André
Schmidt, Alex Andre
dc.subject.por.fl_str_mv Espectros astronômicos
Nebulosas
Galaxias espirais
Galaxias Starburst
topic Espectros astronômicos
Nebulosas
Galaxias espirais
Galaxias Starburst
Galaxy: abundances
ISM: abundances
ISM: HII regions
ISM: evolution
Galaxy: bulge
dc.subject.eng.fl_str_mv Galaxy: abundances
ISM: abundances
ISM: HII regions
ISM: evolution
Galaxy: bulge
description Aims. We derive the age and metallicity of circumnuclear star formation regions (CNSFRs) located in the spiral galaxies NGC6951 and NGC1097 and investigate the cause of the very low equivalent widths of emission lines found for these regions. Methods. We used optical two-dimensional spectroscopic data obtained with Gemini GMOS-IFUs and a grid of photoionization models to derive the the metallicities and ages of CNSFRs. Results. We find star formation rates in the range 0.002–0.14 Mʘ yr-ˡ and oxygen abundance of 12 + log(O/H) ≈ 8.8 dex, similar to those of most metal-rich nebulae located in the inner region of galactic disks. Conclusions. We conclude that the very low emission-line equivalent widths observed in CNSFRs are caused by the “contamination” of the continuum by (1) contribution of the underlying bulge continuum combined with (2) contribution from previous episodes of star formation at the CNSFRs.
publishDate 2008
dc.date.issued.fl_str_mv 2008
dc.date.accessioned.fl_str_mv 2014-08-08T02:06:58Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/99258
dc.identifier.issn.pt_BR.fl_str_mv 0004-6361
dc.identifier.nrb.pt_BR.fl_str_mv 000766517
identifier_str_mv 0004-6361
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url http://hdl.handle.net/10183/99258
dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Astronomy and astrophysics. Les Ulis. Vol. 482, no. 1 (Apr. 2008), p. 59-65
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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reponame_str Repositório Institucional da UFRGS
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