The First Identification of Lyα Changing-look Quasars at High Redshift in DESI

Wei-Jian Guo et al.

Detalles Bibliográficos
Autores: Guo, Wei-Jian, Zou, Hu, Siudek, Malgorzata, Gaztañaga, Enrique, Prada, Francisco
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/394657
Acceso en línea:http://hdl.handle.net/10261/394657
Access Level:acceso abierto
Palabra clave:Accretion
Active galaxies
Supermassive black holes
Quasars
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dc.title.none.fl_str_mv The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
title The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
spellingShingle The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
Guo, Wei-Jian
Accretion
Active galaxies
Supermassive black holes
Quasars
title_short The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
title_full The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
title_fullStr The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
title_full_unstemmed The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
title_sort The First Identification of Lyα Changing-look Quasars at High Redshift in DESI
dc.creator.none.fl_str_mv Guo, Wei-Jian
Zou, Hu
Siudek, Malgorzata
Gaztañaga, Enrique
Prada, Francisco
author Guo, Wei-Jian
author_facet Guo, Wei-Jian
Zou, Hu
Siudek, Malgorzata
Gaztañaga, Enrique
Prada, Francisco
author_role author
author2 Zou, Hu
Siudek, Malgorzata
Gaztañaga, Enrique
Prada, Francisco
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
European Commission
Ministerio de Ciencia, Innovación y Universidades (España)
Gaztañaga, Enrique [0000-0001-9632-0815]
Prada, Francisco [0000-0001-7145-8674]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Accretion
Active galaxies
Supermassive black holes
Quasars
topic Accretion
Active galaxies
Supermassive black holes
Quasars
description Wei-Jian Guo et al.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/394657
url http://hdl.handle.net/10261/394657
dc.language.none.fl_str_mv Inglés
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-126838NB-I00
info:eu-repo/grantAgreement/EC/H2020/754510
https://doi.org/10.3847/2041-8213/adb426
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eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
American Astronomical Society
publisher.none.fl_str_mv IOP Publishing
American 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)
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spelling The First Identification of Lyα Changing-look Quasars at High Redshift in DESIGuo, Wei-JianZou, HuSiudek, MalgorzataGaztañaga, EnriquePrada, FranciscoAccretionActive galaxiesSupermassive black holesQuasarsWei-Jian Guo et al.We present two cases of Lyα changing-look (CL) quasars (J1306 and J1512) along with two additional candidates (J1511 and J1602), all discovered serendipitously at z > 2 through the Dark Energy Spectroscopic Instrument and the Sloan Digital Sky Survey. It is the first time to capture CL events in Lyα at high redshift, which is crucial for understanding the underlying mechanisms driving the CL phenomenon and the evolution of high-redshift quasars and galaxies. We find that the accretion rate in the dim state for these CL objects corresponds to a relatively low value (  2 10 M » ´ -3), which suggests that the inner region of the accretion disk might be in transition between the advection dominated accretion flow (  10 10 M < ~ - - 3 2) and the canonical accretion disk (optically thick, geometrically thin). However, unlike in C IV CL quasars in which broad Lyα remained, the broad C IV may still persist after a CL event occurs in Lyα, making the physical origin of the CL and ionization mechanism event more puzzling and interesting.We thank the referee for useful comments that significantly improved the manuscript. W.-J.G. thanks DESI internal review (Tamara Davis and David Alexander) for very helpful discussions and comments and thanks DESI PubBoard Handler (Benjamin Joachim) for providing timely help. The work is supported by the funding support from the National Key R&D Program of China (grant Nos. 2023YFA1607800 and 2022YFA1602902) and Strategic Priority Research Program of the Chinese Academy of Sciences with grant Nos. XDB0550100 and XDB0550000. The authors also acknowledge the support from the National Natural Science Foundation of China (NSFC; grant Nos. 12120101003, 12373010, 12173051, and 12233008), the National Key R&D Program of China (2023YFA1607804, 2023YFA1608100, and 2023YFF0714800), Beijing Municipal Natural Science Foundation (grant No. 1222028), and China Manned Space Project with Nos. CMS-CSST-2021-A02, CMS-CSST-2021-A04, and CMS-CSST-2021-A05. M.S. acknowledges support by the Polish National Agency for Academic Exchange (Bekker grant BPN/BEK/2021/1/00298/DEC/1) and the State Research Agency of the Spanish Ministry of Science and Innovation under the grants “Galaxy Evolution with Artificial Intelligence” (PGC2018-100852-A-I00) and “BASALT” (PID2021-126838NB-I00). This work was partially supported by the European Union’s Horizon 2020 Research and Innovation program under the Maria Sklodowska-Curie grant agreement (No. 754510). This material is based upon work supported by the US Department of Energy (DOE), Office of Science, Office of High-Energy Physics, under Contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility, under the same contract. Additional support for DESI was provided by the US National Science Foundation (NSF), Division of Astronomical Sciences, under Contract No. AST-0950945 to the NSF’s National Optical-Infrared Astronomy Research Laboratory; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Humanities, Science and Technology of Mexico (CONAHCYT); the Ministry of Science, Innovation and Universities of Spain (MICIU/AEI/10.13039/501100011033); and the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutions. The DESI Legacy Imaging Surveys consist of three individual and complementary projects: the Dark Energy Camera Legacy Survey (DECaLS), the Beijing-Arizona Sky Survey (BASS), and the Mayall z-band Legacy Survey (MzLS). DECaLS, BASS, and MzLS together include data obtained, respectively, at the Blanco telescope, Cerro Tololo Inter-American Observatory, NSF’s NOIRLab; the Bok telescope, Steward Observatory, University of Arizona; and the Mayall telescope, Kitt Peak National Observatory, NOIRLab. NOIRLab is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Pipeline processing and analyses of the data were supported by NOIRLab and the Lawrence Berkeley National Laboratory. Legacy Surveys also uses data products from the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Legacy Surveys was supported by the Director, Office of Science, Office of High Energy Physics of the US Department of Energy; the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility; the US National Science Foundation, Division of Astronomical Sciences; and the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Chinese National Natural Science Foundation. LBNL is managed by the Regents of the University of California under contract to the US Department of Energy. The complete acknowledgments can be found at https://www.legacysurvey.org/.Peer reviewedIOP PublishingAmerican Astronomical SocietyMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)European CommissionMinisterio de Ciencia, Innovación y Universidades (España)Gaztañaga, Enrique [0000-0001-9632-0815]Prada, Francisco [0000-0001-7145-8674]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/394657reponame: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#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-100852-A-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-126838NB-I00info:eu-repo/grantAgreement/EC/H2020/754510https://doi.org/10.3847/2041-8213/adb426Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3946572026-05-22T06:33:51Z
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