Determining star formation rates in active galactic nuclei hosts via stellar population synthesis
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/223059 |
Resumo: | The effect of active galactic nuclei (AGNs) feedback on the host galaxy, and its role in quenching or enhancing star formation, is still uncertain due to the fact that usual star formation rate (SFR) indicators – emission-line luminosities based on the assumption of photoionization by young stars – cannot be used for active galaxies as the ionizing source is the AGN. We thus investigate the use of SFR derived from the stellar population and its relation with that derived from the gas for a sample of 170 AGN hosts and a matched control sample of 291 galaxies. We compare the values of SFR densities obtained via the H α emission line (SFRGas) for regions ionized by hot stars according to diagnostic diagrams with those obtained from stellar population synthesis (SFR ) over the last 1 to 100 Myr. We find that the SFR over the last 20 Myr closely reproduces the SFRGas, although a better match is obtained via the transformation: log(SFR ) = (0.872 ± 0.004)log(SFRGas) − (0.075 ± 0.006) (or log(SFRGas) = (1.147 ± 0.005)log(SFR ) + (0.086 ± 0.080)), which is valid for both AGN hosts and non-active galaxies. We also compare the reddening obtained via the gas H α/H β ratio with that derived via the full spectral fitting in the stellar population synthesis. We find that the ratio between the gas and stellar extinction is in the range 2.64 ≤AVg/AV ≤ 2.85, in approximate agreement with previous results from the literature, obtained for smaller samples. We interpret the difference as being due to the fact that the reddening of the stars is dominated by that affecting the less obscured underlying older population, while the reddening of the gas is larger as it is associated with a younger stellar population buried deeper in the dust. |
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Riffel, RogérioMallmann, Nícolas DulliusIlha, Gabriele da SilvaStorchi-Bergmann, ThaisaRiffel, Rogemar AndréRembold, Sandro BarbozaBizyaev, D.Nascimento, Janaina Correa doSchimoia, Jáderson da SilvaCosta, Luiz N. daBoardman, Nicholas FraserBoquien, MédéricCouto, Guilherme dos Santos2021-06-30T04:24:53Z20210035-8711http://hdl.handle.net/10183/223059001124409The effect of active galactic nuclei (AGNs) feedback on the host galaxy, and its role in quenching or enhancing star formation, is still uncertain due to the fact that usual star formation rate (SFR) indicators – emission-line luminosities based on the assumption of photoionization by young stars – cannot be used for active galaxies as the ionizing source is the AGN. We thus investigate the use of SFR derived from the stellar population and its relation with that derived from the gas for a sample of 170 AGN hosts and a matched control sample of 291 galaxies. We compare the values of SFR densities obtained via the H α emission line (SFRGas) for regions ionized by hot stars according to diagnostic diagrams with those obtained from stellar population synthesis (SFR ) over the last 1 to 100 Myr. We find that the SFR over the last 20 Myr closely reproduces the SFRGas, although a better match is obtained via the transformation: log(SFR ) = (0.872 ± 0.004)log(SFRGas) − (0.075 ± 0.006) (or log(SFRGas) = (1.147 ± 0.005)log(SFR ) + (0.086 ± 0.080)), which is valid for both AGN hosts and non-active galaxies. We also compare the reddening obtained via the gas H α/H β ratio with that derived via the full spectral fitting in the stellar population synthesis. We find that the ratio between the gas and stellar extinction is in the range 2.64 ≤AVg/AV ≤ 2.85, in approximate agreement with previous results from the literature, obtained for smaller samples. We interpret the difference as being due to the fact that the reddening of the stars is dominated by that affecting the less obscured underlying older population, while the reddening of the gas is larger as it is associated with a younger stellar population buried deeper in the dust.application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 501, no. 3 (Mar. 2021), p. 4064-4079Galáxias ativasEvolucao galaticaMeio interestelarFormacao de estrelasGalaxies : activeGalaxies : evolutionGalaxies: ISMGalaxies: star formationGalaxies: stellar contentDetermining star formation rates in active galactic nuclei hosts via stellar population synthesisEstrangeiroinfo: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:UFRGSTEXT001124409.pdf.txt001124409.pdf.txtExtracted Texttext/plain52909http://www.lume.ufrgs.br/bitstream/10183/223059/2/001124409.pdf.txt2c587c5bb5a68d147eb84c96c22ee212MD52ORIGINAL001124409.pdfTexto completo (inglês)application/pdf6617661http://www.lume.ufrgs.br/bitstream/10183/223059/1/001124409.pdf39e1de6eb242afea19a3a972898f0038MD5110183/2230592023-09-24 03:40:24.439803oai:www.lume.ufrgs.br:10183/223059Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-24T06:40:24Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
title |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
spellingShingle |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis Riffel, Rogério Galáxias ativas Evolucao galatica Meio interestelar Formacao de estrelas Galaxies : active Galaxies : evolution Galaxies: ISM Galaxies: star formation Galaxies: stellar content |
title_short |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
title_full |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
title_fullStr |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
title_full_unstemmed |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
title_sort |
Determining star formation rates in active galactic nuclei hosts via stellar population synthesis |
author |
Riffel, Rogério |
author_facet |
Riffel, Rogério Mallmann, Nícolas Dullius Ilha, Gabriele da Silva Storchi-Bergmann, Thaisa Riffel, Rogemar André Rembold, Sandro Barboza Bizyaev, D. Nascimento, Janaina Correa do Schimoia, Jáderson da Silva Costa, Luiz N. da Boardman, Nicholas Fraser Boquien, Médéric Couto, Guilherme dos Santos |
author_role |
author |
author2 |
Mallmann, Nícolas Dullius Ilha, Gabriele da Silva Storchi-Bergmann, Thaisa Riffel, Rogemar André Rembold, Sandro Barboza Bizyaev, D. Nascimento, Janaina Correa do Schimoia, Jáderson da Silva Costa, Luiz N. da Boardman, Nicholas Fraser Boquien, Médéric Couto, Guilherme dos Santos |
author2_role |
author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Riffel, Rogério Mallmann, Nícolas Dullius Ilha, Gabriele da Silva Storchi-Bergmann, Thaisa Riffel, Rogemar André Rembold, Sandro Barboza Bizyaev, D. Nascimento, Janaina Correa do Schimoia, Jáderson da Silva Costa, Luiz N. da Boardman, Nicholas Fraser Boquien, Médéric Couto, Guilherme dos Santos |
dc.subject.por.fl_str_mv |
Galáxias ativas Evolucao galatica Meio interestelar Formacao de estrelas |
topic |
Galáxias ativas Evolucao galatica Meio interestelar Formacao de estrelas Galaxies : active Galaxies : evolution Galaxies: ISM Galaxies: star formation Galaxies: stellar content |
dc.subject.eng.fl_str_mv |
Galaxies : active Galaxies : evolution Galaxies: ISM Galaxies: star formation Galaxies: stellar content |
description |
The effect of active galactic nuclei (AGNs) feedback on the host galaxy, and its role in quenching or enhancing star formation, is still uncertain due to the fact that usual star formation rate (SFR) indicators – emission-line luminosities based on the assumption of photoionization by young stars – cannot be used for active galaxies as the ionizing source is the AGN. We thus investigate the use of SFR derived from the stellar population and its relation with that derived from the gas for a sample of 170 AGN hosts and a matched control sample of 291 galaxies. We compare the values of SFR densities obtained via the H α emission line (SFRGas) for regions ionized by hot stars according to diagnostic diagrams with those obtained from stellar population synthesis (SFR ) over the last 1 to 100 Myr. We find that the SFR over the last 20 Myr closely reproduces the SFRGas, although a better match is obtained via the transformation: log(SFR ) = (0.872 ± 0.004)log(SFRGas) − (0.075 ± 0.006) (or log(SFRGas) = (1.147 ± 0.005)log(SFR ) + (0.086 ± 0.080)), which is valid for both AGN hosts and non-active galaxies. We also compare the reddening obtained via the gas H α/H β ratio with that derived via the full spectral fitting in the stellar population synthesis. We find that the ratio between the gas and stellar extinction is in the range 2.64 ≤AVg/AV ≤ 2.85, in approximate agreement with previous results from the literature, obtained for smaller samples. We interpret the difference as being due to the fact that the reddening of the stars is dominated by that affecting the less obscured underlying older population, while the reddening of the gas is larger as it is associated with a younger stellar population buried deeper in the dust. |
publishDate |
2021 |
dc.date.accessioned.fl_str_mv |
2021-06-30T04:24:53Z |
dc.date.issued.fl_str_mv |
2021 |
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/10183/223059 |
dc.identifier.issn.pt_BR.fl_str_mv |
0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001124409 |
identifier_str_mv |
0035-8711 001124409 |
url |
http://hdl.handle.net/10183/223059 |
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. 501, no. 3 (Mar. 2021), p. 4064-4079 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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