Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region

Yang, Qian, et al.

Detalles Bibliográficos
Autores: Yang, Qian, Ávila, Santiago, García-Bellido, Juan, Gaztañaga, Enrique, Serrano, Santiago, Walker, Alistair R.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/262080
Acceso en línea:http://hdl.handle.net/10261/262080
Access Level:acceso abierto
Palabra clave:Black hole physics
Line: profiles
Galaxies: active
Quasars: general
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spelling Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line regionYang, QianÁvila, SantiagoGarcía-Bellido, JuanGaztañaga, EnriqueSerrano, SantiagoWalker, Alistair R.Black hole physicsLine: profilesGalaxies: activeQuasars: generalYang, Qian, et al.We present new Gemini/GMOS optical spectroscopy of 16 extreme variability quasars (EVQs) that dimmed by more than 1.5 mag in the g band between the Sloan Digital Sky Survey (SDSS) and the Dark Energy Survey epochs (separated by a few years in the quasar rest frame). These EVQs are selected from quasars in the SDSS Stripe 82 region, covering a redshift range of 0.5 < z < 2.1. Nearly half of these EVQs brightened significantly (by more than 0.5 mag in the g band) in a few years after reaching their previous faintest state, and some EVQs showed rapid (non-blazar) variations of greater than 1–2 mag on time-scales of only months. To increase sample statistics, we use a supplemental sample of 33 EVQs with multi-epoch spectra from SDSS that cover the broad Mg II λ2798 line. Leveraging on the large dynamic range in continuum variability between the multi-epoch spectra, we explore the associated variations in the broad Mg II line, whose variability properties have not been well studied before. The broad Mg II flux varies in the same direction as the continuum flux, albeit with a smaller amplitude, which indicates at least some portion of Mg II is reverberating to continuum changes. However, the full width at half-maximum (FWHM) of Mg II does not vary accordingly as continuum changes for most objects in the sample, in contrast to the case of the broad Balmer lines. Using the width of broad Mg II to estimate the black hole mass with single epoch spectra therefore introduces a luminosity-dependent bias.The DES data management system is supported by the National Science Foundation under Grant Numbers AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2015- 71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013) including ERC grant agreements 240672, 291329, and 306478. We acknowledge support from the Brazilian Instituto Nacional de Cienciae Tecnologia (INCT) e-Universe (CNPq grant ˆ 465376/2014-2).Royal Astronomical SocietyNational Science Foundation (US)Ministerio de Ciencia, Innovación y Universidades (España)Ministerio de Economía y Competitividad (España)European CommissionGeneralitat de CatalunyaInstituto Nacional de Ciência e Tecnologia (Brasil)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/262080reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//AYA2015-71825-Pinfo:eu-repo/grantAgreement/MINECO//ESP2015-66861-C3-1-Rinfo:eu-repo/grantAgreement/MINECO//FPA2015-68048-C3-1-Pinfo:eu-repo/grantAgreement/EC/FP7/240672info:eu-repo/grantAgreement/EC/FP7/291329info:eu-repo/grantAgreement/EC/FP7/306478http://doi.org/10.1093/mnras/staa645Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2620802026-05-22T06:33:51Z
dc.title.none.fl_str_mv Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
title Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
spellingShingle Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
Yang, Qian
Black hole physics
Line: profiles
Galaxies: active
Quasars: general
title_short Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
title_full Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
title_fullStr Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
title_full_unstemmed Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
title_sort Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region
dc.creator.none.fl_str_mv Yang, Qian
Ávila, Santiago
García-Bellido, Juan
Gaztañaga, Enrique
Serrano, Santiago
Walker, Alistair R.
author Yang, Qian
author_facet Yang, Qian
Ávila, Santiago
García-Bellido, Juan
Gaztañaga, Enrique
Serrano, Santiago
Walker, Alistair R.
author_role author
author2 Ávila, Santiago
García-Bellido, Juan
Gaztañaga, Enrique
Serrano, Santiago
Walker, Alistair R.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv National Science Foundation (US)
Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
European Commission
Generalitat de Catalunya
Instituto Nacional de Ciência e Tecnologia (Brasil)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Black hole physics
Line: profiles
Galaxies: active
Quasars: general
topic Black hole physics
Line: profiles
Galaxies: active
Quasars: general
description Yang, Qian, et al.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
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/10261/262080
url http://hdl.handle.net/10261/262080
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
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#PLACEHOLDER_PARENT_METADATA_VALUE#
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#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO//AYA2015-71825-P
info:eu-repo/grantAgreement/MINECO//ESP2015-66861-C3-1-R
info:eu-repo/grantAgreement/MINECO//FPA2015-68048-C3-1-P
info:eu-repo/grantAgreement/EC/FP7/240672
info:eu-repo/grantAgreement/EC/FP7/291329
info:eu-repo/grantAgreement/EC/FP7/306478
http://doi.org/10.1093/mnras/staa645
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Astronomical Society
publisher.none.fl_str_mv Royal Astronomical Society
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
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