Effect of bars in AGN host galaxies and black hole activity

Autores
Alonso Giraldes, Maria Sol; Coldwell Lloveras, Georgina Vanesa; Lambas, D. G.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Aims. With the aim of assessing the effects of bars on active galactic nuclei (AGN), we present an analysis of host characteristics and nuclear activity of active galaxies with and without bars. Methods. We selected AGN host galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), using the available emission-line fluxes. By visual inspection of SDSS images we classified the face-on spiral hosts of AGNs brighter than g-mag < 16.5 into barred or unbarred. With the purpose of providing an appropriate quantification of the effects of bars, we also constructed a suitable control sample of unbarred active galaxies with similar redshift, magnitude, morphology, bulge sizes, and local environment distributions. Results. We find that the bar fraction, with respect to the full sample of spiral face-on AGN host galaxies, is 28.5%, in good agreement with previous works. barred AGN host galaxies show an excess of young stellar populations (as derived with the Dn(4000) spectral index), dominated by red u − r and g − r colors, with respect to the control sample, suggesting that bars produce an important effect on galaxy properties of AGN hosts. Regarding the nuclear activity distribution, we find that barred active galaxies show a shift toward higher Lum [OIII] values with respect to AGN without bars. In addition, we also find that this trend is more significant in less massive, younger stellar population and bluer AGN host galaxies. We found that the fraction of powerful AGN increases toward more massive hosts with bluer colors and younger stellar populations residing in denser environments. However, barred host AGN systematically show a higher fraction of powerful active nuclei galaxies with respect to the control sample. We also explored the accretion rate onto the central black holes, finding that barred AGN host show an excess of objects with high accretion rate values with respect to unbarred active galaxies
Fil: Alonso Giraldes, Maria Sol. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Coldwell Lloveras, Georgina Vanesa. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Lambas, D. G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Materia
GALAXIES
BARRED
STATISTICS
AGN
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/5011
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/5011
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effect of bars in AGN host galaxies and black hole activityAlonso Giraldes, Maria SolColdwell Lloveras, Georgina VanesaLambas, D. G.GALAXIESBARREDSTATISTICSAGNhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Aims. With the aim of assessing the effects of bars on active galactic nuclei (AGN), we present an analysis of host characteristics and nuclear activity of active galaxies with and without bars. Methods. We selected AGN host galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), using the available emission-line fluxes. By visual inspection of SDSS images we classified the face-on spiral hosts of AGNs brighter than g-mag < 16.5 into barred or unbarred. With the purpose of providing an appropriate quantification of the effects of bars, we also constructed a suitable control sample of unbarred active galaxies with similar redshift, magnitude, morphology, bulge sizes, and local environment distributions. Results. We find that the bar fraction, with respect to the full sample of spiral face-on AGN host galaxies, is 28.5%, in good agreement with previous works. barred AGN host galaxies show an excess of young stellar populations (as derived with the Dn(4000) spectral index), dominated by red u − r and g − r colors, with respect to the control sample, suggesting that bars produce an important effect on galaxy properties of AGN hosts. Regarding the nuclear activity distribution, we find that barred active galaxies show a shift toward higher Lum [OIII] values with respect to AGN without bars. In addition, we also find that this trend is more significant in less massive, younger stellar population and bluer AGN host galaxies. We found that the fraction of powerful AGN increases toward more massive hosts with bluer colors and younger stellar populations residing in denser environments. However, barred host AGN systematically show a higher fraction of powerful active nuclei galaxies with respect to the control sample. We also explored the accretion rate onto the central black holes, finding that barred AGN host show an excess of objects with high accretion rate values with respect to unbarred active galaxiesFil: Alonso Giraldes, Maria Sol. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: Coldwell Lloveras, Georgina Vanesa. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: Lambas, D. G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaEDP Sciences2013-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5011Alonso Giraldes, Maria Sol; Coldwell Lloveras, Georgina Vanesa; Lambas, D. G.; Effect of bars in AGN host galaxies and black hole activity; EDP Sciences; Astronomy and Astrophysics; 549; 1-2013; 1-100004-6361enginfo:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/01/aa20117-12/aa20117-12.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201220117info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/arxiv/1211.5156info:eu-repo/semantics/altIdentifier/url/http://arxiv.org/abs/1211.5156info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:00:26Zoai:ri.conicet.gov.ar:11336/5011instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:00:26.666CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effect of bars in AGN host galaxies and black hole activity
title Effect of bars in AGN host galaxies and black hole activity
spellingShingle Effect of bars in AGN host galaxies and black hole activity
Alonso Giraldes, Maria Sol
GALAXIES
BARRED
STATISTICS
AGN
title_short Effect of bars in AGN host galaxies and black hole activity
title_full Effect of bars in AGN host galaxies and black hole activity
title_fullStr Effect of bars in AGN host galaxies and black hole activity
title_full_unstemmed Effect of bars in AGN host galaxies and black hole activity
title_sort Effect of bars in AGN host galaxies and black hole activity
dc.creator.none.fl_str_mv Alonso Giraldes, Maria Sol
Coldwell Lloveras, Georgina Vanesa
Lambas, D. G.
author Alonso Giraldes, Maria Sol
author_facet Alonso Giraldes, Maria Sol
Coldwell Lloveras, Georgina Vanesa
Lambas, D. G.
author_role author
author2 Coldwell Lloveras, Georgina Vanesa
Lambas, D. G.
author2_role author
author
dc.subject.none.fl_str_mv GALAXIES
BARRED
STATISTICS
AGN
topic GALAXIES
BARRED
STATISTICS
AGN
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Aims. With the aim of assessing the effects of bars on active galactic nuclei (AGN), we present an analysis of host characteristics and nuclear activity of active galaxies with and without bars. Methods. We selected AGN host galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), using the available emission-line fluxes. By visual inspection of SDSS images we classified the face-on spiral hosts of AGNs brighter than g-mag < 16.5 into barred or unbarred. With the purpose of providing an appropriate quantification of the effects of bars, we also constructed a suitable control sample of unbarred active galaxies with similar redshift, magnitude, morphology, bulge sizes, and local environment distributions. Results. We find that the bar fraction, with respect to the full sample of spiral face-on AGN host galaxies, is 28.5%, in good agreement with previous works. barred AGN host galaxies show an excess of young stellar populations (as derived with the Dn(4000) spectral index), dominated by red u − r and g − r colors, with respect to the control sample, suggesting that bars produce an important effect on galaxy properties of AGN hosts. Regarding the nuclear activity distribution, we find that barred active galaxies show a shift toward higher Lum [OIII] values with respect to AGN without bars. In addition, we also find that this trend is more significant in less massive, younger stellar population and bluer AGN host galaxies. We found that the fraction of powerful AGN increases toward more massive hosts with bluer colors and younger stellar populations residing in denser environments. However, barred host AGN systematically show a higher fraction of powerful active nuclei galaxies with respect to the control sample. We also explored the accretion rate onto the central black holes, finding that barred AGN host show an excess of objects with high accretion rate values with respect to unbarred active galaxies
Fil: Alonso Giraldes, Maria Sol. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Coldwell Lloveras, Georgina Vanesa. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Lambas, D. G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
description Aims. With the aim of assessing the effects of bars on active galactic nuclei (AGN), we present an analysis of host characteristics and nuclear activity of active galaxies with and without bars. Methods. We selected AGN host galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7), using the available emission-line fluxes. By visual inspection of SDSS images we classified the face-on spiral hosts of AGNs brighter than g-mag < 16.5 into barred or unbarred. With the purpose of providing an appropriate quantification of the effects of bars, we also constructed a suitable control sample of unbarred active galaxies with similar redshift, magnitude, morphology, bulge sizes, and local environment distributions. Results. We find that the bar fraction, with respect to the full sample of spiral face-on AGN host galaxies, is 28.5%, in good agreement with previous works. barred AGN host galaxies show an excess of young stellar populations (as derived with the Dn(4000) spectral index), dominated by red u − r and g − r colors, with respect to the control sample, suggesting that bars produce an important effect on galaxy properties of AGN hosts. Regarding the nuclear activity distribution, we find that barred active galaxies show a shift toward higher Lum [OIII] values with respect to AGN without bars. In addition, we also find that this trend is more significant in less massive, younger stellar population and bluer AGN host galaxies. We found that the fraction of powerful AGN increases toward more massive hosts with bluer colors and younger stellar populations residing in denser environments. However, barred host AGN systematically show a higher fraction of powerful active nuclei galaxies with respect to the control sample. We also explored the accretion rate onto the central black holes, finding that barred AGN host show an excess of objects with high accretion rate values with respect to unbarred active galaxies
publishDate 2013
dc.date.none.fl_str_mv 2013-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/5011
Alonso Giraldes, Maria Sol; Coldwell Lloveras, Georgina Vanesa; Lambas, D. G.; Effect of bars in AGN host galaxies and black hole activity; EDP Sciences; Astronomy and Astrophysics; 549; 1-2013; 1-10
0004-6361
url http://hdl.handle.net/11336/5011
identifier_str_mv Alonso Giraldes, Maria Sol; Coldwell Lloveras, Georgina Vanesa; Lambas, D. G.; Effect of bars in AGN host galaxies and black hole activity; EDP Sciences; Astronomy and Astrophysics; 549; 1-2013; 1-10
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/01/aa20117-12/aa20117-12.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201220117
info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/arxiv/1211.5156
info:eu-repo/semantics/altIdentifier/url/http://arxiv.org/abs/1211.5156
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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