Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting

We study the physical properties of 216 z  2.1 Lyα-emitting galaxies (LAEs) discovered in an ultra-deep narrow- MUSYC image of the ECDF-S. We fit their stacked spectral energy distribution (SED) using Charlot & Bruzual templates. We consider star formation histories (SFHs) parameterized by the e...

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Autores: Guaita, L., Padilla, N., Lira, P.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Chile
Idioma:inglés
OAI Identifier:oai:repositorio.anid.cl:10533/237505
Acceso en línea:https://hdl.handle.net/10533/237505
Access Level:acceso abierto
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spelling Lira, P.Padilla, N.Guaita, L.201110.1088/0004-637X/733/2/114https://hdl.handle.net/10533/237505http://purl.org/coar/access_right/c_abf2Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution FittingGuaita, L.Padilla, N.Lira, P.2019-12-18T18:15:40Z2022-07-07T23:41:03Z2019-12-18T18:15:40Z2022-07-07T23:41:03Z2011We study the physical properties of 216 z  2.1 Lyα-emitting galaxies (LAEs) discovered in an ultra-deep narrow- MUSYC image of the ECDF-S. We fit their stacked spectral energy distribution (SED) using Charlot & Bruzual templates. We consider star formation histories (SFHs) parameterized by the e-folding time parameter τ, allowing for exponentially decreasing (τ > 0), exponentially increasing (τ < 0), and constant star formation rates (SFRs). We estimated the average flux at 5015 Å of our LAE sample, finding a non-detection, which translates into negligible He II line emission at z  2.1. In addition to this, the lack of high equivalent width (EW) Lyα line objects ruled out the hypothesis of a top-heavy initial mass function in LAEs. The typical LAEs of our sample are characterized by best-fit parameters and 68% confidence intervals of log(M */M ☉) = 8.6[8.4-9.1], E(B – V) = 0.22[0.00-0.31], τ = –0.02[(– 4)-18] Gyr, and ageSF = 0.018[0.009-3] Gyr. Thus, we obtain robust measurements of low stellar mass and dust content, but we cannot place meaningful constraints on the age or SFH of the LAEs. We also calculate the instantaneous SFR to be 35[0.003-170] M ☉ yr–1, with its average over the last 100 Myr before observation giving SFR100 = 4[2-30] M ☉ yr–1. When we compare the results for the same SFH, typical LAEs at z  2.1 appear dustier and show higher instantaneous SFRs than z  3.1 LAEs, while the observed stellar masses of the two samples seem consistent. Because the majority are low-mass galaxies, our typical LAEs appear to occupy the low-mass end of the distribution of star-forming galaxies at z ~ 2. We perform SED fitting on several sub-samples selected based on photometric properties and find that LAE sub-samples at z  2.1 exhibit heterogeneous properties. The typical IRAC-bright, UV-bright, and red LAEs have the largest stellar mass and dust reddening. The typical UV-faint, IRAC-faint, and high EW LAE sub-samples appear less massive (<109 M ☉) and less dusty, with E(B – V) consistent with zero.FONDAPFONDAP1501000315010003virtual::22074-1WOS:000290676100041https://hdl.handle.net/10533/237505enginstname: Conicytreponame: Repositorio Digital RI2.010.1088/0004-637X/733/2/114info:eu-repo/grantAgreement/Fondap/15010003https://iopscience.iop.org/article/10.1088/0004-637X/733/2/114/metaAtribución-NoComercial-SinDerivadas 3.0 Chilehttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/info:eu-repo/semantics/openAccessLyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution FittingAstrophysical JournalArticuloinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttps://hdl.handle.net/10533/237505http://purl.org/coar/resource_type/c_2df8fbb1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::22074-1045fc0e1-ef55-4532-8afe-69fe789d964dvirtual::22074-110533/237505oai:repositorio.anid.cl:10533/2375052023-07-24 20:23:51.043https://repositorio.anid.clRepositorio ANIDaletelier@anid.cl
dc.title.none.fl_str_mv Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
dc.title.journal.none.fl_str_mv Astrophysical Journal
title Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
spellingShingle Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
Guaita, L.
title_short Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
title_full Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
title_fullStr Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
title_full_unstemmed Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
title_sort Lyα-emitting Galaxies at z = 2.1: Stellar Masses, Dust, and Star Formation Histories from Spectral Energy Distribution Fitting
dc.creator.none.fl_str_mv Guaita, L.
Padilla, N.
Lira, P.
author Guaita, L.
author_facet Guaita, L.
Padilla, N.
Lira, P.
author_role author
author2 Padilla, N.
Lira, P.
author2_role author
author
description We study the physical properties of 216 z  2.1 Lyα-emitting galaxies (LAEs) discovered in an ultra-deep narrow- MUSYC image of the ECDF-S. We fit their stacked spectral energy distribution (SED) using Charlot & Bruzual templates. We consider star formation histories (SFHs) parameterized by the e-folding time parameter τ, allowing for exponentially decreasing (τ > 0), exponentially increasing (τ < 0), and constant star formation rates (SFRs). We estimated the average flux at 5015 Å of our LAE sample, finding a non-detection, which translates into negligible He II line emission at z  2.1. In addition to this, the lack of high equivalent width (EW) Lyα line objects ruled out the hypothesis of a top-heavy initial mass function in LAEs. The typical LAEs of our sample are characterized by best-fit parameters and 68% confidence intervals of log(M */M ☉) = 8.6[8.4-9.1], E(B – V) = 0.22[0.00-0.31], τ = –0.02[(– 4)-18] Gyr, and ageSF = 0.018[0.009-3] Gyr. Thus, we obtain robust measurements of low stellar mass and dust content, but we cannot place meaningful constraints on the age or SFH of the LAEs. We also calculate the instantaneous SFR to be 35[0.003-170] M ☉ yr–1, with its average over the last 100 Myr before observation giving SFR100 = 4[2-30] M ☉ yr–1. When we compare the results for the same SFH, typical LAEs at z  2.1 appear dustier and show higher instantaneous SFRs than z  3.1 LAEs, while the observed stellar masses of the two samples seem consistent. Because the majority are low-mass galaxies, our typical LAEs appear to occupy the low-mass end of the distribution of star-forming galaxies at z ~ 2. We perform SED fitting on several sub-samples selected based on photometric properties and find that LAE sub-samples at z  2.1 exhibit heterogeneous properties. The typical IRAC-bright, UV-bright, and red LAEs have the largest stellar mass and dust reddening. The typical UV-faint, IRAC-faint, and high EW LAE sub-samples appear less massive (<109 M ☉) and less dusty, with E(B – V) consistent with zero.
publishDate 2011
dc.date.issued.none.fl_str_mv 2011
dc.date.accessioned.none.fl_str_mv 2019-12-18T18:15:40Z
2022-07-07T23:41:03Z
dc.date.available.none.fl_str_mv 2019-12-18T18:15:40Z
2022-07-07T23:41:03Z
dc.type.none.fl_str_mv Articulo
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/article
dc.type.openaire.none.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.folio.none.fl_str_mv 15010003
15010003
dc.identifier.idwos.none.fl_str_mv WOS:000290676100041
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/10533/237505
identifier_str_mv 15010003
WOS:000290676100041
url https://hdl.handle.net/10533/237505
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv instname: Conicyt
reponame: Repositorio Digital RI2.0
dc.relation.doi.none.fl_str_mv 10.1088/0004-637X/733/2/114
dc.relation.projectid.none.fl_str_mv info:eu-repo/grantAgreement/Fondap/15010003
dc.relation.uri.none.fl_str_mv https://iopscience.iop.org/article/10.1088/0004-637X/733/2/114/meta
dc.rights.none.fl_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.rights.driver.none.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial-SinDerivadas 3.0 Chile
http://creativecommons.org/licenses/by-nc-nd/3.0/cl/
eu_rights_str_mv openAccess
repository.name.fl_str_mv Repositorio ANID
repository.mail.fl_str_mv aletelier@anid.cl
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