Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/93348 |
Resumo: | We have used theGeminiNear-Infrared Integral-Field Spectrograph to map the age distribution of the stellar population in the inner 400 pc of the Seyfert 2 galaxy Mrk 1157 (NGC 591), at a spatial resolution of 35 pc. We have performed wavelet and principal component analysis on the data in order to remove instrumental signatures. An old stellar population component (age > ~5 Gyr) is dominant within the inner ≈130 pc which we attribute to the galaxy bulge. Beyond this region, up to the borders of the observation field, young- to intermediate-age components (0.1–0.7 Gyr) dominate. As for Mrk 1066, previously studied by us, we find a spatial correlation between this intermediate-age component and a partial ring of low stellar velocity dispersion (σ*). Low-σ* nuclear rings have been observed in other active galaxies, and our results for Mrk 1157 and Mrk 1066 reveal that they are formed by intermediate-age stars. Such age is consistent with a scenario in which the origin of the low-σ* rings is a past event which triggered an inflow of gas and formed stars which still keep the colder kinematics of the gas from which they have formed. No evidence for the presence of an unresolved featureless continuum and hot dust component – as found in Mrk1066 – is found for Mrk 1157. |
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Riffel, RogérioRiffel, Rogemar AndréFerrari, FabricioStorchi-Bergmann, Thaisa2014-04-13T01:49:49Z20110035-8711http://hdl.handle.net/10183/93348000815382We have used theGeminiNear-Infrared Integral-Field Spectrograph to map the age distribution of the stellar population in the inner 400 pc of the Seyfert 2 galaxy Mrk 1157 (NGC 591), at a spatial resolution of 35 pc. We have performed wavelet and principal component analysis on the data in order to remove instrumental signatures. An old stellar population component (age > ~5 Gyr) is dominant within the inner ≈130 pc which we attribute to the galaxy bulge. Beyond this region, up to the borders of the observation field, young- to intermediate-age components (0.1–0.7 Gyr) dominate. As for Mrk 1066, previously studied by us, we find a spatial correlation between this intermediate-age component and a partial ring of low stellar velocity dispersion (σ*). Low-σ* nuclear rings have been observed in other active galaxies, and our results for Mrk 1157 and Mrk 1066 reveal that they are formed by intermediate-age stars. Such age is consistent with a scenario in which the origin of the low-σ* rings is a past event which triggered an inflow of gas and formed stars which still keep the colder kinematics of the gas from which they have formed. No evidence for the presence of an unresolved featureless continuum and hot dust component – as found in Mrk1066 – is found for Mrk 1157.application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 416, no. 1 (Sept. 2011), p. 493-500Nucleo galaticoGaláxias ativasGalaxias seyfertGalaxias StarburstCinemáticaGas ionizadoGaláxia NGC 591Methods: data analysisGalaxies: individual: Mrk 1157Galaxies: individual: NGC591Galaxies: seyfertGalaxies: stellar contentIntermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157Estrangeiroinfo: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:UFRGSORIGINAL000815382.pdf000815382.pdfTexto completo (inglês)application/pdf14289001http://www.lume.ufrgs.br/bitstream/10183/93348/1/000815382.pdf994128b62a29f29d4e7b2ecb351261cdMD51TEXT000815382.pdf.txt000815382.pdf.txtExtracted Texttext/plain39435http://www.lume.ufrgs.br/bitstream/10183/93348/2/000815382.pdf.txt78cf409673c35dea392fb79d3ebe749cMD52THUMBNAIL000815382.pdf.jpg000815382.pdf.jpgGenerated Thumbnailimage/jpeg2064http://www.lume.ufrgs.br/bitstream/10183/93348/3/000815382.pdf.jpgb03296f1a51f9bc275c767f9be8ef4d1MD5310183/933482023-10-01 03:37:08.236648oai:www.lume.ufrgs.br:10183/93348Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-10-01T06:37:08Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
title |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
spellingShingle |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 Riffel, Rogério Nucleo galatico Galáxias ativas Galaxias seyfert Galaxias Starburst Cinemática Gas ionizado Galáxia NGC 591 Methods: data analysis Galaxies: individual: Mrk 1157 Galaxies: individual: NGC591 Galaxies: seyfert Galaxies: stellar content |
title_short |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
title_full |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
title_fullStr |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
title_full_unstemmed |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
title_sort |
Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 |
author |
Riffel, Rogério |
author_facet |
Riffel, Rogério Riffel, Rogemar André Ferrari, Fabricio Storchi-Bergmann, Thaisa |
author_role |
author |
author2 |
Riffel, Rogemar André Ferrari, Fabricio Storchi-Bergmann, Thaisa |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Riffel, Rogério Riffel, Rogemar André Ferrari, Fabricio Storchi-Bergmann, Thaisa |
dc.subject.por.fl_str_mv |
Nucleo galatico Galáxias ativas Galaxias seyfert Galaxias Starburst Cinemática Gas ionizado Galáxia NGC 591 |
topic |
Nucleo galatico Galáxias ativas Galaxias seyfert Galaxias Starburst Cinemática Gas ionizado Galáxia NGC 591 Methods: data analysis Galaxies: individual: Mrk 1157 Galaxies: individual: NGC591 Galaxies: seyfert Galaxies: stellar content |
dc.subject.eng.fl_str_mv |
Methods: data analysis Galaxies: individual: Mrk 1157 Galaxies: individual: NGC591 Galaxies: seyfert Galaxies: stellar content |
description |
We have used theGeminiNear-Infrared Integral-Field Spectrograph to map the age distribution of the stellar population in the inner 400 pc of the Seyfert 2 galaxy Mrk 1157 (NGC 591), at a spatial resolution of 35 pc. We have performed wavelet and principal component analysis on the data in order to remove instrumental signatures. An old stellar population component (age > ~5 Gyr) is dominant within the inner ≈130 pc which we attribute to the galaxy bulge. Beyond this region, up to the borders of the observation field, young- to intermediate-age components (0.1–0.7 Gyr) dominate. As for Mrk 1066, previously studied by us, we find a spatial correlation between this intermediate-age component and a partial ring of low stellar velocity dispersion (σ*). Low-σ* nuclear rings have been observed in other active galaxies, and our results for Mrk 1157 and Mrk 1066 reveal that they are formed by intermediate-age stars. Such age is consistent with a scenario in which the origin of the low-σ* rings is a past event which triggered an inflow of gas and formed stars which still keep the colder kinematics of the gas from which they have formed. No evidence for the presence of an unresolved featureless continuum and hot dust component – as found in Mrk1066 – is found for Mrk 1157. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011 |
dc.date.accessioned.fl_str_mv |
2014-04-13T01:49:49Z |
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Estrangeiro info:eu-repo/semantics/article |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/93348 |
dc.identifier.issn.pt_BR.fl_str_mv |
0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000815382 |
identifier_str_mv |
0035-8711 000815382 |
url |
http://hdl.handle.net/10183/93348 |
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. 416, no. 1 (Sept. 2011), p. 493-500 |
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openAccess |
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