Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108921 |
Resumo: | The Seyfert 2 galaxy NGC 1241 presents a 1.5 kpc large circumnuclear ring (CNR) of star formation embracing a small bar plus leading arms. Those structures are Paα emitters but barely seen in Haα. It also presents stellar trailing arms inside the CNR. Gemini and HST imagery allow the construction of high-resolution (V−H) and (J−K) color maps, as well as a (J−K) versus K color-magnitude diagram of this complex region. The CNR s s is heavily obscured in V, but a fairly transparent window appears in the direction of the nucleus. Nonetheless, the nucleus presents a (J−K) color that is redder than the CNR. The CNR is composed of extremely young s H II regions still enshrouded in their dust cocoons. However, the nuclear (J−K) color cannot be explained in s this manner. Therefore, we propose the contribution of C stars as the most feasible mechanism for explaining the colors. If the nuclear stellar population is comparable to that of the Large Magellanic Cloud bar, 500 C stars and 25,000 asymptotic giant branch O-rich stars inside 50 pc may reproduce the observed colors. C stars release enriched material to the nuclear environment, probably fueling the central engine of this Seyfert 2 galaxy during the lifetime of stars with masses in the range 2 Mʘ < M cstar < 6 Mʘ (C-star phase). The ejected material that , C star, remains trapped in the central potential might also explain the systematically observed increased strength of the optical CN bands in Seyfert 2 galaxies and is consistent with the significant contribution of intermediate age stars to the optical continuum of low-luminosity active galactic nuclei. |
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Dottori, Horacio AlbertoDíaz, Rubén JoaquínCarranza, Gustavo JoseLipari, SebastianSantos Junior, Joao Francisco Coelho dos2015-01-14T02:15:59Z20050004-637Xhttp://hdl.handle.net/10183/108921000536651The Seyfert 2 galaxy NGC 1241 presents a 1.5 kpc large circumnuclear ring (CNR) of star formation embracing a small bar plus leading arms. Those structures are Paα emitters but barely seen in Haα. It also presents stellar trailing arms inside the CNR. Gemini and HST imagery allow the construction of high-resolution (V−H) and (J−K) color maps, as well as a (J−K) versus K color-magnitude diagram of this complex region. The CNR s s is heavily obscured in V, but a fairly transparent window appears in the direction of the nucleus. Nonetheless, the nucleus presents a (J−K) color that is redder than the CNR. The CNR is composed of extremely young s H II regions still enshrouded in their dust cocoons. However, the nuclear (J−K) color cannot be explained in s this manner. Therefore, we propose the contribution of C stars as the most feasible mechanism for explaining the colors. If the nuclear stellar population is comparable to that of the Large Magellanic Cloud bar, 500 C stars and 25,000 asymptotic giant branch O-rich stars inside 50 pc may reproduce the observed colors. C stars release enriched material to the nuclear environment, probably fueling the central engine of this Seyfert 2 galaxy during the lifetime of stars with masses in the range 2 Mʘ < M cstar < 6 Mʘ (C-star phase). The ejected material that , C star, remains trapped in the central potential might also explain the systematically observed increased strength of the optical CN bands in Seyfert 2 galaxies and is consistent with the significant contribution of intermediate age stars to the optical continuum of low-luminosity active galactic nuclei.application/pdfengThe astrophysical journal. Chicago. Vol. 628, no. 2, pt. 2 (Aug. 2005), p. L85-L88Galaxias seyfertPoeira cosmicaNucleo galaticoEstrelas gigantesEstrelas variaveisFormacao de estrelasRegiões HIIGalaxies: activeGalaxies: individual (NGC 1241)Galaxies: ISMGalaxies: nucleiGalaxies: photometryGalaxies: stellar contentSeparating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241Estrangeiroinfo: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:UFRGSORIGINAL000536651.pdf000536651.pdfTexto completo (inglês)application/pdf1097932http://www.lume.ufrgs.br/bitstream/10183/108921/1/000536651.pdf271b357ce85f23f39ea88f3712da1928MD51TEXT000536651.pdf.txt000536651.pdf.txtExtracted Texttext/plain20960http://www.lume.ufrgs.br/bitstream/10183/108921/2/000536651.pdf.txtc1b8abab01781739f0d5d2a4ae6a6b1fMD52THUMBNAIL000536651.pdf.jpg000536651.pdf.jpgGenerated Thumbnailimage/jpeg2130http://www.lume.ufrgs.br/bitstream/10183/108921/3/000536651.pdf.jpgaa4e24b012363ee5c189c41c15f3dc89MD5310183/1089212018-10-23 08:40:12.672oai:www.lume.ufrgs.br:10183/108921Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T11:40:12Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
title |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
spellingShingle |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 Dottori, Horacio Alberto Galaxias seyfert Poeira cosmica Nucleo galatico Estrelas gigantes Estrelas variaveis Formacao de estrelas Regiões HII Galaxies: active Galaxies: individual (NGC 1241) Galaxies: ISM Galaxies: nuclei Galaxies: photometry Galaxies: stellar content |
title_short |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
title_full |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
title_fullStr |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
title_full_unstemmed |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
title_sort |
Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 |
author |
Dottori, Horacio Alberto |
author_facet |
Dottori, Horacio Alberto Díaz, Rubén Joaquín Carranza, Gustavo Jose Lipari, Sebastian Santos Junior, Joao Francisco Coelho dos |
author_role |
author |
author2 |
Díaz, Rubén Joaquín Carranza, Gustavo Jose Lipari, Sebastian Santos Junior, Joao Francisco Coelho dos |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Dottori, Horacio Alberto Díaz, Rubén Joaquín Carranza, Gustavo Jose Lipari, Sebastian Santos Junior, Joao Francisco Coelho dos |
dc.subject.por.fl_str_mv |
Galaxias seyfert Poeira cosmica Nucleo galatico Estrelas gigantes Estrelas variaveis Formacao de estrelas Regiões HII |
topic |
Galaxias seyfert Poeira cosmica Nucleo galatico Estrelas gigantes Estrelas variaveis Formacao de estrelas Regiões HII Galaxies: active Galaxies: individual (NGC 1241) Galaxies: ISM Galaxies: nuclei Galaxies: photometry Galaxies: stellar content |
dc.subject.eng.fl_str_mv |
Galaxies: active Galaxies: individual (NGC 1241) Galaxies: ISM Galaxies: nuclei Galaxies: photometry Galaxies: stellar content |
description |
The Seyfert 2 galaxy NGC 1241 presents a 1.5 kpc large circumnuclear ring (CNR) of star formation embracing a small bar plus leading arms. Those structures are Paα emitters but barely seen in Haα. It also presents stellar trailing arms inside the CNR. Gemini and HST imagery allow the construction of high-resolution (V−H) and (J−K) color maps, as well as a (J−K) versus K color-magnitude diagram of this complex region. The CNR s s is heavily obscured in V, but a fairly transparent window appears in the direction of the nucleus. Nonetheless, the nucleus presents a (J−K) color that is redder than the CNR. The CNR is composed of extremely young s H II regions still enshrouded in their dust cocoons. However, the nuclear (J−K) color cannot be explained in s this manner. Therefore, we propose the contribution of C stars as the most feasible mechanism for explaining the colors. If the nuclear stellar population is comparable to that of the Large Magellanic Cloud bar, 500 C stars and 25,000 asymptotic giant branch O-rich stars inside 50 pc may reproduce the observed colors. C stars release enriched material to the nuclear environment, probably fueling the central engine of this Seyfert 2 galaxy during the lifetime of stars with masses in the range 2 Mʘ < M cstar < 6 Mʘ (C-star phase). The ejected material that , C star, remains trapped in the central potential might also explain the systematically observed increased strength of the optical CN bands in Seyfert 2 galaxies and is consistent with the significant contribution of intermediate age stars to the optical continuum of low-luminosity active galactic nuclei. |
publishDate |
2005 |
dc.date.issued.fl_str_mv |
2005 |
dc.date.accessioned.fl_str_mv |
2015-01-14T02:15:59Z |
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/10183/108921 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000536651 |
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0004-637X 000536651 |
url |
http://hdl.handle.net/10183/108921 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Chicago. Vol. 628, no. 2, pt. 2 (Aug. 2005), p. L85-L88 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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