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

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dc.contributor.authorZeltyn, Grisha
dc.contributor.authorTrakhtenbrot, Benny
dc.contributor.authorEracleous, Michael
dc.contributor.authorYang, Qian
dc.contributor.authorGreen, Paul
dc.contributor.authorAnderson, Scott F.
dc.contributor.authorLaMassa, Stephanie
dc.contributor.authorRunnoe, Jessie
dc.contributor.authorAssef, Roberto J.
dc.contributor.authorBauer, Franz E.
dc.contributor.authorBrandt, W. N.
dc.contributor.authorDavis, Megan C.
dc.contributor.authorFrederick, Sara E.
dc.contributor.authorFries, Logan B.
dc.contributor.authorGraham, Matthew J.
dc.contributor.authorGrogin, Norman A.
dc.contributor.authorGuolo, Muryel
dc.contributor.authorHernandez-Garcia, Lorena
dc.contributor.authorKoekemoer, Anton M.
dc.contributor.authorKrumpe, Mirko
dc.contributor.authorLiu, Xin
dc.contributor.authorMartinez-Aldama, Mary Loli
dc.contributor.authorRicci, Claudio
dc.contributor.authorSchneider, Donald P.
dc.contributor.authorShen, Yue
dc.contributor.authorSniegowska, Marzena
dc.contributor.authorTemple, Matthew J.
dc.contributor.authorTrump, Jonathan R.
dc.contributor.authorXue, Yongquan
dc.contributor.authorBrownstein, Joel R.
dc.contributor.authorDwelly, Tom
dc.contributor.authorMorrison, Sean
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorPan, Kaike
dc.contributor.authorKollmeier, Juna A.
dc.date.accessioned2025-01-20T17:05:31Z
dc.date.available2025-01-20T17:05:31Z
dc.date.issued2024
dc.description.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.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ad2f30
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad2f30
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90726
dc.identifier.wosidWOS:001208556000001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleExploring Changing-look Active Galactic Nuclei with the Sloan Digital Sky Survey V: First Year Results
dc.typeartículo
dc.volumen966
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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