The nucleus of C16.16 : another case of a double-peaked active galactic nucleus
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108767 |
Resumo: | We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low-ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), and an ionization parameter U = 10 -2.8 reproduce the observed narrow lines. The AGN continuum shows a strong variation, while the Balmer lines vary moderately. The Balmer lines have a broad and asymmetric component with double-peaked structure. Using the profiles of emission lines originated in a relativistic circular disk, we successfully fit the observed broad Hα profile. This disk component shows no variation in the observations. A variable, intermediate-width (~6000 km s-ˡ) Balmer component is also found. These two com ponents seem to arise by different processes. |
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Rodriguez-Ardila, AlbertoPastoriza, Miriani GriseldaBica, Eduardo Luiz DamianiMaza, Jose2015-01-07T02:10:37Z19960004-637Xhttp://hdl.handle.net/10183/108767000148737We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low-ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), and an ionization parameter U = 10 -2.8 reproduce the observed narrow lines. The AGN continuum shows a strong variation, while the Balmer lines vary moderately. The Balmer lines have a broad and asymmetric component with double-peaked structure. Using the profiles of emission lines originated in a relativistic circular disk, we successfully fit the observed broad Hα profile. This disk component shows no variation in the observations. A variable, intermediate-width (~6000 km s-ˡ) Balmer component is also found. These two com ponents seem to arise by different processes.application/pdfengThe astrophysical journal. Chicago. Vol. 463, no. 2, pt. 1 (June 1996), p. 522-527Astrofisica extragalaticaNucleo galaticoDiscos de acrecaoGalaxias seyfertEspectros astronômicosGalaxies: individual (C16.16)Galaxies: nucleiGalaxies: seyfertLine: profilesThe nucleus of C16.16 : another case of a double-peaked active galactic nucleusEstrangeiroinfo: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:UFRGSORIGINAL000148737.pdf000148737.pdfTexto completo (inglês)application/pdf162722http://www.lume.ufrgs.br/bitstream/10183/108767/1/000148737.pdf1993c7cfb59f77a333530d75dd93aef2MD51TEXT000148737.pdf.txt000148737.pdf.txtExtracted Texttext/plain132http://www.lume.ufrgs.br/bitstream/10183/108767/2/000148737.pdf.txt34f718d9e29ebd6bb3feb7654e7361cdMD52THUMBNAIL000148737.pdf.jpg000148737.pdf.jpgGenerated Thumbnailimage/jpeg2088http://www.lume.ufrgs.br/bitstream/10183/108767/3/000148737.pdf.jpg6438fba871b084d66d11aed261ebd8aaMD5310183/1087672024-04-11 06:24:31.867059oai:www.lume.ufrgs.br:10183/108767Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-11T09:24:31Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
title |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
spellingShingle |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus Rodriguez-Ardila, Alberto Astrofisica extragalatica Nucleo galatico Discos de acrecao Galaxias seyfert Espectros astronômicos Galaxies: individual (C16.16) Galaxies: nuclei Galaxies: seyfert Line: profiles |
title_short |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
title_full |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
title_fullStr |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
title_full_unstemmed |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
title_sort |
The nucleus of C16.16 : another case of a double-peaked active galactic nucleus |
author |
Rodriguez-Ardila, Alberto |
author_facet |
Rodriguez-Ardila, Alberto Pastoriza, Miriani Griselda Bica, Eduardo Luiz Damiani Maza, Jose |
author_role |
author |
author2 |
Pastoriza, Miriani Griselda Bica, Eduardo Luiz Damiani Maza, Jose |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Rodriguez-Ardila, Alberto Pastoriza, Miriani Griselda Bica, Eduardo Luiz Damiani Maza, Jose |
dc.subject.por.fl_str_mv |
Astrofisica extragalatica Nucleo galatico Discos de acrecao Galaxias seyfert Espectros astronômicos |
topic |
Astrofisica extragalatica Nucleo galatico Discos de acrecao Galaxias seyfert Espectros astronômicos Galaxies: individual (C16.16) Galaxies: nuclei Galaxies: seyfert Line: profiles |
dc.subject.eng.fl_str_mv |
Galaxies: individual (C16.16) Galaxies: nuclei Galaxies: seyfert Line: profiles |
description |
We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low-ionization emission lines show large equivalent widths. Narrow-line ratios are used to parameterize and investigate the physical conditions in the narrow-line region. Photoionization models with nitrogen depletion, ionization continuum typical of an active galactic nucleus (AGN), and an ionization parameter U = 10 -2.8 reproduce the observed narrow lines. The AGN continuum shows a strong variation, while the Balmer lines vary moderately. The Balmer lines have a broad and asymmetric component with double-peaked structure. Using the profiles of emission lines originated in a relativistic circular disk, we successfully fit the observed broad Hα profile. This disk component shows no variation in the observations. A variable, intermediate-width (~6000 km s-ˡ) Balmer component is also found. These two com ponents seem to arise by different processes. |
publishDate |
1996 |
dc.date.issued.fl_str_mv |
1996 |
dc.date.accessioned.fl_str_mv |
2015-01-07T02:10:37Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/108767 |
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0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000148737 |
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0004-637X 000148737 |
url |
http://hdl.handle.net/10183/108767 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Chicago. Vol. 463, no. 2, pt. 1 (June 1996), p. 522-527 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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