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  Exploring Changing-look Active Galactic Nuclei with the Sloan Digital Sky Survey V: First Year Results

Zeltyn, G., Trakhtenbrot, B., Eracleous, M., Yang, Q., Green, P., Anderson, S. F., et al. (2024). Exploring Changing-look Active Galactic Nuclei with the Sloan Digital Sky Survey V: First Year Results. ASTROPHYSICAL JOURNAL, 966(1): 85. doi:10.3847/1538-4357/ad2f30.

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Zeltyn, Grisha, Author
Trakhtenbrot, Benny, Author
Eracleous, Michael, Author
Yang, Qian, Author
Green, Paul, Author
Anderson, Scott F., Author
LaMassa, Stephanie, Author
Runnoe, Jessie, Author
Assef, Roberto J., Author
Bauer, Franz E., Author
Brandt, W. N., Author
Davis, Megan C., Author
Frederick, Sara E., Author
Fries, Logan B., Author
Graham, Matthew J., Author
Grogin, Norman A., Author
Guolo, Muryel, Author
Hernandez-Garcia, Lorena, Author
Koekemoer, Anton M., Author
Krumpe, Mirko, Author           
Liu, Xin, Author           Martinez-Aldama, Mary Loli, AuthorRicci, Claudio, AuthorSchneider, Donald P., AuthorShen, Yue, AuthorSniegowska, Marzena, AuthorTemple, Matthew J., AuthorTrump, Jonathan R., AuthorXue, Yongquan, AuthorBrownstein, Joel R., AuthorDwelly, Tom1, Author           Morrison, Sean, AuthorBizyaev, Dmitry, AuthorPan, Kaike, AuthorKollmeier, Juna A., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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Free keywords: BLACK-HOLE MASS; EXTREME VARIABILITY QUASARS; INFRARED-SURVEY-EXPLORER; RAPID TURN-ON; DATA RELEASE; EDDINGTON RATIO; MIDINFRARED VARIABILITY; OPTICAL VARIABILITY; ACCRETION DISKS; FOLLOW-UPAstronomy & Astrophysics;
 Abstract: "Changing-look" active galactic nuclei (CL-AGNs) challenge our basic ideas about the physics of accretion flows and circumnuclear gas around supermassive black holes. Using first-year Sloan Digital Sky Survey V (SDSS-V) repeated spectroscopy of nearly 29,000 previously known active galactic nuclei (AGNs), combined with dedicated follow-up spectroscopy, and publicly available optical light curves, we have identified 116 CL-AGNs where (at least) one broad emission line has essentially (dis-)appeared, as well as 88 other extremely variable systems. Our CL-AGN sample, with 107 newly identified cases, is the largest reported to date, and includes similar to 0.4% of the AGNs reobserved in first-year SDSS-V operations. Among our CL-AGNs, 67% exhibit dimming while 33% exhibit brightening. Our sample probes extreme AGN spectral variability on months to decades timescales, including some cases of recurring transitions on surprisingly short timescales (less than or similar to 2 months in the rest frame). We find that CL events are preferentially found in lower-Eddington-ratio (f Edd) systems: Our CL-AGNs have a f Edd distribution that significantly differs from that of a carefully constructed, redshift- and luminosity-matched control sample (Anderson-Darling test yielding p AD approximate to 6 x 10-5; median f Edd approximate to 0.025 versus 0.043). This preference for low f Edd strengthens previous findings of higher CL-AGN incidence at lower f Edd, found in smaller samples. Finally, we show that the broad Mg ii emission line in our CL-AGN sample tends to vary significantly less than the broad H beta emission line. Our large CL-AGN sample demonstrates the advantages and challenges in using multi-epoch spectroscopy from large surveys to study extreme AGN variability and physics.

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Language(s): eng - English
 Dates: 2024-04-26
 Publication Status: Published online
 Pages: 28
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 001208556000001
DOI: 10.3847/1538-4357/ad2f30
 Degree: -

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Title: ASTROPHYSICAL JOURNAL
Source Genre: Journal
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Publ. Info: TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND : IOP Publishing Ltd
Pages: - Volume / Issue: 966 (1) Sequence Number: 85 Start / End Page: - Identifier: ISSN: 0004-637X
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