Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/99090 |
Resumo: | Context. It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and supernovae. Near-infrared (J − K)− Mk diagrams of young stellar clusters in nearby spiral galaxies show a bi-modal distribution that is consistent with a fast decline of their intrinsic extinction at an early epoch. Aims. The distinct features in the color-magnitude diagrams (CMD) and the fast change of colors for the youngest clusters allow us to place constraints on their early evolutionary phases, including the time scale for the decreasing extinction caused for instance by gas and dust expulsion. Methods. Monte Carlo simulations of cluster populations were performed using the power-law distribution function g(M, τ) ∝ Mατγ. Integrated colors were computed from Starburst99 models. The simulated near-infrared CMD were compared with those observed for six grand-design, spiral galaxies using statistical goodness-of-fit tests. Results. The CMDs indicate a significant mortality of young, massive clusters with γ = −1.4±0.5. High initial extinction Av = 8−11m and strong nebular emission are required to reproduce the bi-modal color distributions of the clusters. An extended star formation phase of longer than 5 Myr is suggested. The reduction of the internal extinction of the clusters starts during their active star formation and lasts for a period of 5−10 Myr. |
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Grosbol, PrebenDottori, Horacio Alberto2014-08-05T02:07:35Z20130004-6361http://hdl.handle.net/10183/99090000919782Context. It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and supernovae. Near-infrared (J − K)− Mk diagrams of young stellar clusters in nearby spiral galaxies show a bi-modal distribution that is consistent with a fast decline of their intrinsic extinction at an early epoch. Aims. The distinct features in the color-magnitude diagrams (CMD) and the fast change of colors for the youngest clusters allow us to place constraints on their early evolutionary phases, including the time scale for the decreasing extinction caused for instance by gas and dust expulsion. Methods. Monte Carlo simulations of cluster populations were performed using the power-law distribution function g(M, τ) ∝ Mατγ. Integrated colors were computed from Starburst99 models. The simulated near-infrared CMD were compared with those observed for six grand-design, spiral galaxies using statistical goodness-of-fit tests. Results. The CMDs indicate a significant mortality of young, massive clusters with γ = −1.4±0.5. High initial extinction Av = 8−11m and strong nebular emission are required to reproduce the bi-modal color distributions of the clusters. An extended star formation phase of longer than 5 Myr is suggested. The reduction of the internal extinction of the clusters starts during their active star formation and lasts for a period of 5−10 Myr.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 551 (Mar. 2013), L13, 4 p.Formacao de estrelasFotometria astronômicaAglomerados estelaresGaláxiasDinamica estelarNebulosasAstronomia infravermelhaStars: formationGalaxies: star clusters: generalGalaxies: spiralMethods: statisticalInfrared: generalMortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral 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:UFRGSORIGINAL000919782.pdf000919782.pdfTexto completo (inglês)application/pdf677046http://www.lume.ufrgs.br/bitstream/10183/99090/1/000919782.pdf534b235bc13f88e6d77e9d07a97ad4f2MD51TEXT000919782.pdf.txt000919782.pdf.txtExtracted Texttext/plain21277http://www.lume.ufrgs.br/bitstream/10183/99090/2/000919782.pdf.txtb6f117762d6d3efaea73eb143d2d1ae9MD52THUMBNAIL000919782.pdf.jpg000919782.pdf.jpgGenerated Thumbnailimage/jpeg2040http://www.lume.ufrgs.br/bitstream/10183/99090/3/000919782.pdf.jpge9996029ed740d34d0f02522dd723098MD5310183/990902018-10-22 08:26:56.207oai:www.lume.ufrgs.br:10183/99090Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-22T11:26:56Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
title |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
spellingShingle |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies Grosbol, Preben Formacao de estrelas Fotometria astronômica Aglomerados estelares Galáxias Dinamica estelar Nebulosas Astronomia infravermelha Stars: formation Galaxies: star clusters: general Galaxies: spiral Methods: statistical Infrared: general |
title_short |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
title_full |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
title_fullStr |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
title_full_unstemmed |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
title_sort |
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies |
author |
Grosbol, Preben |
author_facet |
Grosbol, Preben Dottori, Horacio Alberto |
author_role |
author |
author2 |
Dottori, Horacio Alberto |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Grosbol, Preben Dottori, Horacio Alberto |
dc.subject.por.fl_str_mv |
Formacao de estrelas Fotometria astronômica Aglomerados estelares Galáxias Dinamica estelar Nebulosas Astronomia infravermelha |
topic |
Formacao de estrelas Fotometria astronômica Aglomerados estelares Galáxias Dinamica estelar Nebulosas Astronomia infravermelha Stars: formation Galaxies: star clusters: general Galaxies: spiral Methods: statistical Infrared: general |
dc.subject.eng.fl_str_mv |
Stars: formation Galaxies: star clusters: general Galaxies: spiral Methods: statistical Infrared: general |
description |
Context. It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and supernovae. Near-infrared (J − K)− Mk diagrams of young stellar clusters in nearby spiral galaxies show a bi-modal distribution that is consistent with a fast decline of their intrinsic extinction at an early epoch. Aims. The distinct features in the color-magnitude diagrams (CMD) and the fast change of colors for the youngest clusters allow us to place constraints on their early evolutionary phases, including the time scale for the decreasing extinction caused for instance by gas and dust expulsion. Methods. Monte Carlo simulations of cluster populations were performed using the power-law distribution function g(M, τ) ∝ Mατγ. Integrated colors were computed from Starburst99 models. The simulated near-infrared CMD were compared with those observed for six grand-design, spiral galaxies using statistical goodness-of-fit tests. Results. The CMDs indicate a significant mortality of young, massive clusters with γ = −1.4±0.5. High initial extinction Av = 8−11m and strong nebular emission are required to reproduce the bi-modal color distributions of the clusters. An extended star formation phase of longer than 5 Myr is suggested. The reduction of the internal extinction of the clusters starts during their active star formation and lasts for a period of 5−10 Myr. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2014-08-05T02:07:35Z |
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000919782 |
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http://hdl.handle.net/10183/99090 |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 551 (Mar. 2013), L13, 4 p. |
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