SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/181917 |
Resumo: | We investigate radial gradients in the recent star formation history (SFH) of 1917 galaxies with 0.01 < z < 0.14 from the Mapping Nearby Galaxies at Apache Point Observatory project. For each galaxy, we obtain twodimensional maps and radial profiles for three spectroscopically measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000 Å break), EW(HδA), and EW(Hα) (the equivalent width of the Hδ absorption and the Hα emission line). The majority of the spaxels are consistent with models of a continuously declining star formation rate, indicating that starbursts occur rarely in local galaxies with regular morphologies. We classify the galaxies into three classes: fully star-forming (SF), partly quenched (PQ), and totally quenched (TQ). The galaxies that are less massive than 1010Me present at most weak radial gradients in the diagnostic parameters. In contrast, massive galaxies with a stellar mass above 1010Me present significant gradients in the three diagnostic parameters if they are classified as SF or PQ but show weak gradients in Dn(4000) and EW(HδA) and no gradients in EW(Hα) if they are in the TQ class. This implies the existence of a critical stellar mass (∼1010Me) above which the star formation in a galaxy is shut down from the inside out. Galaxies tend to evolve synchronously from the inner to the outer regions before their mass reaches the critical value. We have further divided the sample at a fixed mass by both bulge-to-total luminosity ratio and morphological type, finding that our conclusions hold regardless of these factors; it appears that the presence of a central dense object is not a driving parameter but rather a by-product of the star formation cessation process. |
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Wang, EnciLi, ChengXiao, TingLin, L.Bershady, Matthew A.Law, David R.Merrifield, MichaelSánchez, Sebastián F.Riffel, Rogemar AndréRiffel, RogérioYan, Renbin2018-09-13T02:31:49Z20180004-637Xhttp://hdl.handle.net/10183/181917001074351We investigate radial gradients in the recent star formation history (SFH) of 1917 galaxies with 0.01 < z < 0.14 from the Mapping Nearby Galaxies at Apache Point Observatory project. For each galaxy, we obtain twodimensional maps and radial profiles for three spectroscopically measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000 Å break), EW(HδA), and EW(Hα) (the equivalent width of the Hδ absorption and the Hα emission line). The majority of the spaxels are consistent with models of a continuously declining star formation rate, indicating that starbursts occur rarely in local galaxies with regular morphologies. We classify the galaxies into three classes: fully star-forming (SF), partly quenched (PQ), and totally quenched (TQ). The galaxies that are less massive than 1010Me present at most weak radial gradients in the diagnostic parameters. In contrast, massive galaxies with a stellar mass above 1010Me present significant gradients in the three diagnostic parameters if they are classified as SF or PQ but show weak gradients in Dn(4000) and EW(HδA) and no gradients in EW(Hα) if they are in the TQ class. This implies the existence of a critical stellar mass (∼1010Me) above which the star formation in a galaxy is shut down from the inside out. Galaxies tend to evolve synchronously from the inner to the outer regions before their mass reaches the critical value. We have further divided the sample at a fixed mass by both bulge-to-total luminosity ratio and morphological type, finding that our conclusions hold regardless of these factors; it appears that the presence of a central dense object is not a driving parameter but rather a by-product of the star formation cessation process.application/pdfengThe astrophysical journal. Bristol. Vol. 856, no. 2 (Apr. 2018), 137, 22 p.Formacao de galaxiasEvolucao galaticaMapeamentos astronômicosGalaxies: evolutionGalaxies: formationGalaxies: generalGalaxies: stellar contentMethods: observationalSurveysSDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural propertiesEstrangeiroinfo: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:UFRGSORIGINAL001074351.pdfTexto completo (inglês)application/pdf3864352http://www.lume.ufrgs.br/bitstream/10183/181917/1/001074351.pdf07cc379c38fd20daa1d03da4d005cb38MD51TEXT001074351.pdf.txt001074351.pdf.txtExtracted Texttext/plain98799http://www.lume.ufrgs.br/bitstream/10183/181917/2/001074351.pdf.txtc1dea8379123175764d9170d889fb85eMD52THUMBNAIL001074351.pdf.jpg001074351.pdf.jpgGenerated Thumbnailimage/jpeg1990http://www.lume.ufrgs.br/bitstream/10183/181917/3/001074351.pdf.jpg9348cb56e7b45d967d00ecff7577edc7MD5310183/1819172023-09-24 03:39:46.885639oai:www.lume.ufrgs.br:10183/181917Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-24T06:39:46Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
title |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
spellingShingle |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties Wang, Enci Formacao de galaxias Evolucao galatica Mapeamentos astronômicos Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys |
title_short |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
title_full |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
title_fullStr |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
title_full_unstemmed |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
title_sort |
SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties |
author |
Wang, Enci |
author_facet |
Wang, Enci Li, Cheng Xiao, Ting Lin, L. Bershady, Matthew A. Law, David R. Merrifield, Michael Sánchez, Sebastián F. Riffel, Rogemar André Riffel, Rogério Yan, Renbin |
author_role |
author |
author2 |
Li, Cheng Xiao, Ting Lin, L. Bershady, Matthew A. Law, David R. Merrifield, Michael Sánchez, Sebastián F. Riffel, Rogemar André Riffel, Rogério Yan, Renbin |
author2_role |
author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Wang, Enci Li, Cheng Xiao, Ting Lin, L. Bershady, Matthew A. Law, David R. Merrifield, Michael Sánchez, Sebastián F. Riffel, Rogemar André Riffel, Rogério Yan, Renbin |
dc.subject.por.fl_str_mv |
Formacao de galaxias Evolucao galatica Mapeamentos astronômicos |
topic |
Formacao de galaxias Evolucao galatica Mapeamentos astronômicos Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys |
dc.subject.eng.fl_str_mv |
Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys |
description |
We investigate radial gradients in the recent star formation history (SFH) of 1917 galaxies with 0.01 < z < 0.14 from the Mapping Nearby Galaxies at Apache Point Observatory project. For each galaxy, we obtain twodimensional maps and radial profiles for three spectroscopically measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000 Å break), EW(HδA), and EW(Hα) (the equivalent width of the Hδ absorption and the Hα emission line). The majority of the spaxels are consistent with models of a continuously declining star formation rate, indicating that starbursts occur rarely in local galaxies with regular morphologies. We classify the galaxies into three classes: fully star-forming (SF), partly quenched (PQ), and totally quenched (TQ). The galaxies that are less massive than 1010Me present at most weak radial gradients in the diagnostic parameters. In contrast, massive galaxies with a stellar mass above 1010Me present significant gradients in the three diagnostic parameters if they are classified as SF or PQ but show weak gradients in Dn(4000) and EW(HδA) and no gradients in EW(Hα) if they are in the TQ class. This implies the existence of a critical stellar mass (∼1010Me) above which the star formation in a galaxy is shut down from the inside out. Galaxies tend to evolve synchronously from the inner to the outer regions before their mass reaches the critical value. We have further divided the sample at a fixed mass by both bulge-to-total luminosity ratio and morphological type, finding that our conclusions hold regardless of these factors; it appears that the presence of a central dense object is not a driving parameter but rather a by-product of the star formation cessation process. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-09-13T02:31:49Z |
dc.date.issued.fl_str_mv |
2018 |
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/10183/181917 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001074351 |
identifier_str_mv |
0004-637X 001074351 |
url |
http://hdl.handle.net/10183/181917 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 856, no. 2 (Apr. 2018), 137, 22 p. |
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openAccess |
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