Population synthesis of H II galaxies
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/88770 |
Resumo: | We study the stellar population of galaxies with active star formation, determining ages of the stellar components by means of spectral population synthesis of their absorption spectra. The data consist of optical spectra of 185 nearby (z ≤ 0.075) emission-line galaxies. They are mostly HII galaxies, but we also include some starbursts and Seyfert 2s, for comparison purposes. They were grouped into 19 high signal-to-noise ratio template spectra, according to their continuum distribution, absorption- and emission-line characteristics. The templates were then synthesized with a star cluster spectral base. The synthesis results indicate that HII galaxies are typically age-composite stellar systems, presenting important contributions from generations up to as old as 500 Myr. We detect a significant contribution of populations with ages older than 1 Gyr in two groups of HII galaxies. The age distributions of stellar populations among starbursts can vary considerably despite similarities in the emission-line spectra. In the case of Seyfert 2 groups we obtain important contributions from the old population, consistent with a bulge. From the diversity of star formation histories, we conclude that typical HII galaxies in the local Universe are not systems presently forming their first stellar generation. |
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Raimann, Daniel IunesBica, Eduardo Luiz DamianiStorchi-Bergmann, ThaisaMelnick, JorgeSchmitt, Henrique Roberto2014-03-21T01:49:02Z20000035-8711http://hdl.handle.net/10183/88770000275687We study the stellar population of galaxies with active star formation, determining ages of the stellar components by means of spectral population synthesis of their absorption spectra. The data consist of optical spectra of 185 nearby
(z ≤ 0.075) emission-line galaxies. They are mostly HII galaxies, but we also include some starbursts and Seyfert 2s, for comparison purposes. They were grouped into 19 high signal-to-noise ratio template spectra, according to their continuum distribution, absorption- and emission-line characteristics. The templates were then synthesized with a star cluster spectral base. The synthesis results indicate that HII galaxies are typically age-composite stellar systems, presenting important contributions from generations up to as old as 500 Myr. We detect a significant contribution of populations with ages older than 1 Gyr in two groups of HII galaxies. The age distributions of stellar populations among starbursts can vary considerably despite similarities in the emission-line spectra. In the case of Seyfert 2 groups we obtain important contributions from the old population, consistent with a bulge. From the diversity of star formation histories, we conclude that typical HII galaxies in the local Universe are not systems presently forming their first stellar generation.application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 314, no. 2 (May 2000), p. 295-306Galáxias ativasEspectros astronômicosFormacao de estrelasEvolucao estelarHII regionsGalaxies: compactGalaxies: evolutionGalaxies: starburstGalaxies: stellar contentPopulation synthesis of H II galaxiesEstrangeiroinfo: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:UFRGSORIGINAL000275687.pdf000275687.pdfTexto completo (inglês)application/pdf655271http://www.lume.ufrgs.br/bitstream/10183/88770/1/000275687.pdf638df14bd02bdddbc1713c7ac607ccdfMD51TEXT000275687.pdf.txt000275687.pdf.txtExtracted Texttext/plain50575http://www.lume.ufrgs.br/bitstream/10183/88770/2/000275687.pdf.txte69aefe7a14e8a5905b7ade49bced1d9MD52THUMBNAIL000275687.pdf.jpg000275687.pdf.jpgGenerated Thumbnailimage/jpeg1949http://www.lume.ufrgs.br/bitstream/10183/88770/3/000275687.pdf.jpg4803fd66ef72a8def1f81fe0978435a6MD5310183/887702024-04-13 06:44:29.850215oai:www.lume.ufrgs.br:10183/88770Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-13T09:44:29Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Population synthesis of H II galaxies |
title |
Population synthesis of H II galaxies |
spellingShingle |
Population synthesis of H II galaxies Raimann, Daniel Iunes Galáxias ativas Espectros astronômicos Formacao de estrelas Evolucao estelar HII regions Galaxies: compact Galaxies: evolution Galaxies: starburst Galaxies: stellar content |
title_short |
Population synthesis of H II galaxies |
title_full |
Population synthesis of H II galaxies |
title_fullStr |
Population synthesis of H II galaxies |
title_full_unstemmed |
Population synthesis of H II galaxies |
title_sort |
Population synthesis of H II galaxies |
author |
Raimann, Daniel Iunes |
author_facet |
Raimann, Daniel Iunes Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa Melnick, Jorge Schmitt, Henrique Roberto |
author_role |
author |
author2 |
Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa Melnick, Jorge Schmitt, Henrique Roberto |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Raimann, Daniel Iunes Bica, Eduardo Luiz Damiani Storchi-Bergmann, Thaisa Melnick, Jorge Schmitt, Henrique Roberto |
dc.subject.por.fl_str_mv |
Galáxias ativas Espectros astronômicos Formacao de estrelas Evolucao estelar |
topic |
Galáxias ativas Espectros astronômicos Formacao de estrelas Evolucao estelar HII regions Galaxies: compact Galaxies: evolution Galaxies: starburst Galaxies: stellar content |
dc.subject.eng.fl_str_mv |
HII regions Galaxies: compact Galaxies: evolution Galaxies: starburst Galaxies: stellar content |
description |
We study the stellar population of galaxies with active star formation, determining ages of the stellar components by means of spectral population synthesis of their absorption spectra. The data consist of optical spectra of 185 nearby
(z ≤ 0.075) emission-line galaxies. They are mostly HII galaxies, but we also include some starbursts and Seyfert 2s, for comparison purposes. They were grouped into 19 high signal-to-noise ratio template spectra, according to their continuum distribution, absorption- and emission-line characteristics. The templates were then synthesized with a star cluster spectral base. The synthesis results indicate that HII galaxies are typically age-composite stellar systems, presenting important contributions from generations up to as old as 500 Myr. We detect a significant contribution of populations with ages older than 1 Gyr in two groups of HII galaxies. The age distributions of stellar populations among starbursts can vary considerably despite similarities in the emission-line spectra. In the case of Seyfert 2 groups we obtain important contributions from the old population, consistent with a bulge. From the diversity of star formation histories, we conclude that typical HII galaxies in the local Universe are not systems presently forming their first stellar generation. |
publishDate |
2000 |
dc.date.issued.fl_str_mv |
2000 |
dc.date.accessioned.fl_str_mv |
2014-03-21T01:49:02Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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/10183/88770 |
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0035-8711 |
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000275687 |
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http://hdl.handle.net/10183/88770 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the royal astronomical society. Oxford. Vol. 314, no. 2 (May 2000), p. 295-306 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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