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BASS XXXIX: Swift-BAT AGN with changing-look optical spectra

Temple, Matthew J. and Ricci, Claudio and Koss, Michael J. and Trakhtenbrot, Benny and Bauer, Franz E. and Mushotzky, Richard and Rojas, Alejandra F. and Caglar, Turgay and Harrison, Fiona and Oh, Kyuseok and Padilla Gonzalez, Estefania and Powell, Meredith C. and Ricci, Federica and Riffel, Rogério and Stern, Daniel and Urry, C. Megan (2022) BASS XXXIX: Swift-BAT AGN with changing-look optical spectra. Monthly Notices of the Royal Astronomical Society, 518 (2). pp. 2938-2953. ISSN 0035-8711. doi:10.1093/mnras/stac3279. https://resolver.caltech.edu/CaltechAUTHORS:20230123-451841300.37

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Abstract

Changing-look (CL) AGN are unique probes of accretion onto supermassive black holes (SMBHs), especially when simultaneous observations in complementary wavebands allow investigations into the properties of their accretion flows. We present the results of a search for CL behaviour in 412 Swift-BAT detected AGN with multiple epochs of optical spectroscopy from the BAT AGN Spectroscopic Survey (BASS). 125 of these AGN also have 14–195  keV ultra-hard X-ray light curves from Swift-BAT which are contemporaneous with the epochs of optical spectroscopy. Eight CL events are presented for the first time, where the appearance or disappearance of broad Balmer line emission leads to a change in the observed Seyfert type classification. Combining with known events from the literature, 21 AGN from BASS are now known to display CL behaviour. Nine CL events have 14–195  keV data available, and five of these CL events can be associated with significant changes in their 14–195  keV flux from BAT. The ultra-hard X-ray flux is less affected by obscuration and so these changes in the 14–195 keV band suggest that the majority of our CL events are not due to changes in line-of-sight obscuration. We derive a CL rate of 0.7–6.2 per cent on 10–25 yr time-scales, and show that many transitions happen within at most a few years. Our results motivate further multiwavelength observations with higher cadence to better understand the variability physics of accretion onto SMBHs.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stac3279DOIArticle
ORCID:
AuthorORCID
Temple, Matthew J.0000-0001-8433-550X
Ricci, Claudio0000-0001-5231-2645
Koss, Michael J.0000-0002-7998-9581
Trakhtenbrot, Benny0000-0002-3683-7297
Bauer, Franz E.0000-0002-8686-8737
Mushotzky, Richard0000-0002-7962-5446
Rojas, Alejandra F.0000-0003-0006-8681
Caglar, Turgay0000-0002-9144-2255
Harrison, Fiona0000-0003-2992-8024
Oh, Kyuseok0000-0002-5037-951X
Padilla Gonzalez, Estefania0000-0003-0209-9246
Powell, Meredith C.0000-0003-2284-8603
Ricci, Federica0000-0001-5742-5980
Riffel, Rogério0000-0002-1321-1320
Stern, Daniel0000-0003-2686-9241
Urry, C. Megan0000-0002-0745-9792
Additional Information:We thank the anonymous referee for a constructive report. MJT acknowledges support from CONICYT (Fondo ALMA 31190036) and a FONDECYT fellowship (Proyecto 3220516). CR acknowledges support from FONDECYT (Iniciacion grant 11190831) and ANID BASAL project FB210003. MJK acknowledges support from NASA (ADAP award NNH16CT03C). BT acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement 950533) and from the Israel Science Foundation (grant 1849/19). FEB acknowledges support from the ANID Millennium Science Initiative Program (ICN12_009), CATA-BASAL (ACE21000 and FB210003) and FONDECYT Regular (1190818 and 1200495). AFR acknowledges support from FONDECYT Postdoctorado Proyecto 3210157. KO acknowledges support from the Korea Astronomy and Space Science Institute under the R&D program (Project No. 2022-1-868-04) supervised by the Ministry of Science and ICT and from the National Research Foundation of Korea (NRF-2020R1C1C1005462). FR acknowledges support from PRIN MIUR 2017PH3WAT (‘Black hole winds and the baryon life cycle of galaxies’). RR thanks Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Proj. 311223/2020-6, 304927/2017-1 and 400352/2016-8), Fundação de amparo à pesquisa do Rio Grande do Sul (FAPERGS, Proj. 16/2551-0000251-7 and 19/1750-2), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Proj. 0001). This research has made use of the NASA/IPAC Extragalactic Data base (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology.
Group:Astronomy Department, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ALMA 31190036
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3220516
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)11190831
Agencia Nacional de Investigación y Desarrollo (ANID)FB210003
NASANNH16CT03C
European Research Council (ERC)950533
Israel Science Foundation1849/19
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ICN12_009
Agencia Nacional de Investigación y Desarrollo (ANID)ACE21000
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1190818
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1200495
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3210157
Korea Astronomy and Space Science Institute (KASI)2022-1-868-04
National Research Foundation of KoreaNRF-2020R1C1C1005462
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)2017PH3WAT
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)311223/2020-6
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)304927/2017-1
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)400352/2016-8
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS)16/2551-0000251-7
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS)19/1750-2
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)0001
Issue or Number:2
DOI:10.1093/mnras/stac3279
Record Number:CaltechAUTHORS:20230123-451841300.37
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20230123-451841300.37
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118901
Collection:CaltechAUTHORS
Deposited By: Research Services Depository
Deposited On:16 Feb 2023 17:24
Last Modified:21 Feb 2023 18:00

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