San Pedro Mártir observations of microvariability in obscured quasars

Fast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or intra-night variability, and this phenomenon has been monitored in samples of blazars and unobscured AGNs. Detecting optical microvariations in...

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Autores: Polednikova, Jana, Ederoclite, Alessandro, Cepa, Jordi, Diego, José A. de, González-Serrano, José Ignacio, Bongiovanni, Ángel, Oteo Gómez, Iván, Pérez-García, Ana M., Pérez-Martínez, Ricardo, Pintos-Castro, Irene, Ramón-Pérez, Marina, Sánchez-Portal, Miguel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/140389
Acceso en línea:http://hdl.handle.net/10261/140389
Access Level:acceso abierto
Palabra clave:Quasars: general
Galaxies: individual: Mrk 477
Galaxies: individual: SDSS J1430+1339
Galaxies: individual: SDSS J075+5050
Galaxies: active
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repository_id_str
spelling San Pedro Mártir observations of microvariability in obscured quasarsPolednikova, JanaEderoclite, AlessandroCepa, JordiDiego, José A. deGonzález-Serrano, José IgnacioBongiovanni, ÁngelOteo Gómez, IvánPérez-García, Ana M.Pérez-Martínez, RicardoPintos-Castro, IreneRamón-Pérez, MarinaSánchez-Portal, MiguelQuasars: generalGalaxies: individual: Mrk 477Galaxies: individual: SDSS J1430+1339Galaxies: individual: SDSS J075+5050Galaxies: activeFast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or intra-night variability, and this phenomenon has been monitored in samples of blazars and unobscured AGNs. Detecting optical microvariations in targets hidden by the obscuring torus is a challenging task because the region responsible for the variations is hidden from our sight. However, there have been reports of fast variations in obscured Seyfert galaxies in X-rays, which rises the question whether microvariations can also be detected in obscured AGNs in the optical regime. Because the expected variations are very small and can easily be lost within the noise, the analysis requires a statistical approach. We report the use of a one-way analysis of variance, ANOVA, with which we searched for microvariability. ANOVA was successfully employed in previous studies of unobscured AGNs. As a result, we found microvariable events during three observing blocks: in two we observed the same object (Mrk 477), and in another, J0759+5050. The results on Mrk 477 confirm previous findings. However, since Mrk 477 is quite a peculiar target with hidden broad-line regions, we cannot rule out the possibility that we have serendipitously chosen a target prone to variations.This research has been supported by the Spanish Ministerio de Economía y Competitividad (MINECO) under the grant AYA2014-58861-C3-1. I.O. acknowledges support from the European Research Council (ERC) in the form of Advanced Grant, COSMICISM. J.A.D. is grateful for the support from the grant UNAM-DGAPA-PAPIIT IN110013 Program and the Canary islands CIE: Tricontinental Atlantic Campus. A.E. acknowledges support by the grant AYA2012-30789. J. I. González-Serrano is grateful for the support from AYA2011-29517-C03-02.Peer ReviewedEDP SciencesMinisterio de Economía y Competitividad (España)European CommissionEuropean Research CouncilCampus Atlántico Tricontinental CanariasUniversidad Nacional Autónoma de MéxicoConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2016201620152016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/140389reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2014-58861-C3-1-Pinfo:eu-repo/grantAgreement/EC/FP7/321302http://dx.doi.org/10.1051/0004-6361/201525952Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1403892026-05-22T06:33:51Z
dc.title.none.fl_str_mv San Pedro Mártir observations of microvariability in obscured quasars
title San Pedro Mártir observations of microvariability in obscured quasars
spellingShingle San Pedro Mártir observations of microvariability in obscured quasars
Polednikova, Jana
Quasars: general
Galaxies: individual: Mrk 477
Galaxies: individual: SDSS J1430+1339
Galaxies: individual: SDSS J075+5050
Galaxies: active
title_short San Pedro Mártir observations of microvariability in obscured quasars
title_full San Pedro Mártir observations of microvariability in obscured quasars
title_fullStr San Pedro Mártir observations of microvariability in obscured quasars
title_full_unstemmed San Pedro Mártir observations of microvariability in obscured quasars
title_sort San Pedro Mártir observations of microvariability in obscured quasars
dc.creator.none.fl_str_mv Polednikova, Jana
Ederoclite, Alessandro
Cepa, Jordi
Diego, José A. de
González-Serrano, José Ignacio
Bongiovanni, Ángel
Oteo Gómez, Iván
Pérez-García, Ana M.
Pérez-Martínez, Ricardo
Pintos-Castro, Irene
Ramón-Pérez, Marina
Sánchez-Portal, Miguel
author Polednikova, Jana
author_facet Polednikova, Jana
Ederoclite, Alessandro
Cepa, Jordi
Diego, José A. de
González-Serrano, José Ignacio
Bongiovanni, Ángel
Oteo Gómez, Iván
Pérez-García, Ana M.
Pérez-Martínez, Ricardo
Pintos-Castro, Irene
Ramón-Pérez, Marina
Sánchez-Portal, Miguel
author_role author
author2 Ederoclite, Alessandro
Cepa, Jordi
Diego, José A. de
González-Serrano, José Ignacio
Bongiovanni, Ángel
Oteo Gómez, Iván
Pérez-García, Ana M.
Pérez-Martínez, Ricardo
Pintos-Castro, Irene
Ramón-Pérez, Marina
Sánchez-Portal, Miguel
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
European Commission
European Research Council
Campus Atlántico Tricontinental Canarias
Universidad Nacional Autónoma de México
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Quasars: general
Galaxies: individual: Mrk 477
Galaxies: individual: SDSS J1430+1339
Galaxies: individual: SDSS J075+5050
Galaxies: active
topic Quasars: general
Galaxies: individual: Mrk 477
Galaxies: individual: SDSS J1430+1339
Galaxies: individual: SDSS J075+5050
Galaxies: active
description Fast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or intra-night variability, and this phenomenon has been monitored in samples of blazars and unobscured AGNs. Detecting optical microvariations in targets hidden by the obscuring torus is a challenging task because the region responsible for the variations is hidden from our sight. However, there have been reports of fast variations in obscured Seyfert galaxies in X-rays, which rises the question whether microvariations can also be detected in obscured AGNs in the optical regime. Because the expected variations are very small and can easily be lost within the noise, the analysis requires a statistical approach. We report the use of a one-way analysis of variance, ANOVA, with which we searched for microvariability. ANOVA was successfully employed in previous studies of unobscured AGNs. As a result, we found microvariable events during three observing blocks: in two we observed the same object (Mrk 477), and in another, J0759+5050. The results on Mrk 477 confirm previous findings. However, since Mrk 477 is quite a peculiar target with hidden broad-line regions, we cannot rule out the possibility that we have serendipitously chosen a target prone to variations.
publishDate 2015
dc.date.none.fl_str_mv 2015
2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/140389
url http://hdl.handle.net/10261/140389
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2014-58861-C3-1-P
info:eu-repo/grantAgreement/EC/FP7/321302
http://dx.doi.org/10.1051/0004-6361/201525952
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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