CCD imaging of NGC 4861 : ionized gas properties and stellar formation
Autor(a) principal: | |
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Data de Publicação: | 1994 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108110 |
Resumo: | This work undertakes the study of the galaxy NGC 4861, using imaging centered at the strong lines Hα, Hβ, [O III] λ5007 and nearby continua. Integrated, absolute fluxes of 28 H II regions, and the region known as the bright knot, have been measured showing correlations between the equivalent width of Hβ and the excitation index log([O III]/Hβ). An excitation gradient has been detected along the chain of H II regions extending northwards from the bright knot, which is unusual for irregular galaxies like NGC 4861. We suggest that this gradient is due to different stages of evolution, or ages, of the H II regions. The continuum fluxes of eight emissionless associations and lhe continuum colors of the companion galaxy IC 3961 have also been measured, and the presence of ionized gas cannot be detected. The age and mass of the stellar population and ionizing stars of the bright knot were subsequently estimated. lt was also verified that this region is the most important burst of star formation in NGC 4861. |
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Cepa, JordiVilchez, Jose M.Dottori, Horacio AlbertoBarth, Clarissa Silva2014-12-12T02:15:26Z19940004-6256http://hdl.handle.net/10183/108110000254259This work undertakes the study of the galaxy NGC 4861, using imaging centered at the strong lines Hα, Hβ, [O III] λ5007 and nearby continua. Integrated, absolute fluxes of 28 H II regions, and the region known as the bright knot, have been measured showing correlations between the equivalent width of Hβ and the excitation index log([O III]/Hβ). An excitation gradient has been detected along the chain of H II regions extending northwards from the bright knot, which is unusual for irregular galaxies like NGC 4861. We suggest that this gradient is due to different stages of evolution, or ages, of the H II regions. The continuum fluxes of eight emissionless associations and lhe continuum colors of the companion galaxy IC 3961 have also been measured, and the presence of ionized gas cannot be detected. The age and mass of the stellar population and ionizing stars of the bright knot were subsequently estimated. lt was also verified that this region is the most important burst of star formation in NGC 4861.application/pdfengThe Astronomical Journal. New York. Vol. 108, no. 6 (Dec. 1994), p. 2069-2077GaláxiasGaláxia NGC 4861Regiões HIIGaláxia IC 3961MetalicidadeAbundanciaFormacao de estrelasAstrofisica extragalaticaCCD imaging of NGC 4861 : ionized gas properties and stellar formationEstrangeiroinfo: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:UFRGSORIGINAL000254259.pdf000254259.pdfTexto completo (inglês)application/pdf302061http://www.lume.ufrgs.br/bitstream/10183/108110/1/000254259.pdfbded62856477a1d44686a2d06140b458MD51TEXT000254259.pdf.txt000254259.pdf.txtExtracted Texttext/plain198http://www.lume.ufrgs.br/bitstream/10183/108110/2/000254259.pdf.txt7896537a18d918c65ebfd2b5b6eb9c18MD52THUMBNAIL000254259.pdf.jpg000254259.pdf.jpgGenerated Thumbnailimage/jpeg2000http://www.lume.ufrgs.br/bitstream/10183/108110/3/000254259.pdf.jpg6be08a7129097780b715274b7d3e5ceeMD5310183/1081102018-10-22 09:01:20.333oai:www.lume.ufrgs.br:10183/108110Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-22T12:01:20Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
title |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
spellingShingle |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation Cepa, Jordi Galáxias Galáxia NGC 4861 Regiões HII Galáxia IC 3961 Metalicidade Abundancia Formacao de estrelas Astrofisica extragalatica |
title_short |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
title_full |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
title_fullStr |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
title_full_unstemmed |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
title_sort |
CCD imaging of NGC 4861 : ionized gas properties and stellar formation |
author |
Cepa, Jordi |
author_facet |
Cepa, Jordi Vilchez, Jose M. Dottori, Horacio Alberto Barth, Clarissa Silva |
author_role |
author |
author2 |
Vilchez, Jose M. Dottori, Horacio Alberto Barth, Clarissa Silva |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Cepa, Jordi Vilchez, Jose M. Dottori, Horacio Alberto Barth, Clarissa Silva |
dc.subject.por.fl_str_mv |
Galáxias Galáxia NGC 4861 Regiões HII Galáxia IC 3961 Metalicidade Abundancia Formacao de estrelas Astrofisica extragalatica |
topic |
Galáxias Galáxia NGC 4861 Regiões HII Galáxia IC 3961 Metalicidade Abundancia Formacao de estrelas Astrofisica extragalatica |
description |
This work undertakes the study of the galaxy NGC 4861, using imaging centered at the strong lines Hα, Hβ, [O III] λ5007 and nearby continua. Integrated, absolute fluxes of 28 H II regions, and the region known as the bright knot, have been measured showing correlations between the equivalent width of Hβ and the excitation index log([O III]/Hβ). An excitation gradient has been detected along the chain of H II regions extending northwards from the bright knot, which is unusual for irregular galaxies like NGC 4861. We suggest that this gradient is due to different stages of evolution, or ages, of the H II regions. The continuum fluxes of eight emissionless associations and lhe continuum colors of the companion galaxy IC 3961 have also been measured, and the presence of ionized gas cannot be detected. The age and mass of the stellar population and ionizing stars of the bright knot were subsequently estimated. lt was also verified that this region is the most important burst of star formation in NGC 4861. |
publishDate |
1994 |
dc.date.issued.fl_str_mv |
1994 |
dc.date.accessioned.fl_str_mv |
2014-12-12T02:15:26Z |
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/10183/108110 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-6256 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000254259 |
identifier_str_mv |
0004-6256 000254259 |
url |
http://hdl.handle.net/10183/108110 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astronomical Journal. New York. Vol. 108, no. 6 (Dec. 1994), p. 2069-2077 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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