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TOWARD AN UNDERSTANDING OF CHANGING-LOOK QUASARS: AN ARCHIVAL SPECTROSCOPIC SEARCH IN SDSS

Author(s): Ruan, John J; Anderson, Scott F; Cales, Sabrina L; Eracleous, Michael; Green, Paul J; et al

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dc.contributor.authorRuan, John J-
dc.contributor.authorAnderson, Scott F-
dc.contributor.authorCales, Sabrina L-
dc.contributor.authorEracleous, Michael-
dc.contributor.authorGreen, Paul J-
dc.contributor.authorMorganson, Eric-
dc.contributor.authorRunnoe, Jessie C-
dc.contributor.authorShen, Yue-
dc.contributor.authorWilkinson, Tessa D-
dc.contributor.authorBlanton, Michael R-
dc.contributor.authorDwelly, Tom-
dc.contributor.authorGeorgakakis, Antonis-
dc.contributor.authorGreene, Jenny E.-
dc.contributor.authorLaMassa, Stephanie M-
dc.contributor.authorMerloni, Andrea-
dc.contributor.authorSchneider, Donald P-
dc.date.accessioned2019-10-09T19:32:47Z-
dc.date.available2019-10-09T19:32:47Z-
dc.date.issued2016-08-01en_US
dc.identifier.citationRuan, John J, Anderson, Scott F, Cales, Sabrina L, Eracleous, Michael, Green, Paul J, Morganson, Eric, Runnoe, Jessie C, Shen, Yue, Wilkinson, Tessa D, Blanton, Michael R, Dwelly, Tom, Georgakakis, Antonis, Greene, Jenny E, LaMassa, Stephanie M, Merloni, Andrea, Schneider, Donald P. (2016). TOWARD AN UNDERSTANDING OF CHANGING-LOOK QUASARS: AN ARCHIVAL SPECTROSCOPIC SEARCH IN SDSS. ASTROPHYSICAL JOURNAL, 826 (10.3847/0004-637X/826/2/188en_US
dc.identifier.issn0004-637X-
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1n44f-
dc.description.abstractThe uncertain origin of the recently discovered “changing-look” quasar phenomenon-in which a luminous quasar dims significantly to a quiescent state in repeat spectroscopy over similar to 10-year timescales-may present unexpected challenges to our understanding of quasar accretion. To better understand this phenomenon, we take a first step toward building a sample of changing-look quasars with a systematic but simple archival search for these objects in the Sloan Digital Sky Survey Data Release 12. By leveraging the >10-year baselines for objects with repeat spectroscopy, we uncover two new changing-look quasars. and a third discovered previously. Decomposition of the multiepoch spectra and analysis of the broad emission lines suggest that the quasar accretion disk emission dims because of rapidly decreasing accretion rates (by factors of greater than or similar to 2.5), while disfavoring changes in intrinsic dust extinction for the two objects where these analyses are possible. Broad emission line energetics also support intrinsic dimming of quasar emission as the origin for this phenomenon rather than transient tidal disruption events or supernovae. Although our search criteria included quasars at all redshifts and transitions from either quasar-like to galaxy-like states or the reverse, all of the clear cases of changing-look quasars discovered were at relatively low redshift (z similar to 0.2-0.3) and only exhibit quasar-like to galaxy-like transitions.en_US
dc.language.isoen_USen_US
dc.relationhttps://ui.adsabs.harvard.edu/abs/2016ApJ...826..188R/abstracten_US
dc.relation.ispartofASTROPHYSICAL JOURNALen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleTOWARD AN UNDERSTANDING OF CHANGING-LOOK QUASARS: AN ARCHIVAL SPECTROSCOPIC SEARCH IN SDSSen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.3847/0004-637X/826/2/188-
dc.date.eissued2016-07-29en_US
dc.identifier.eissn1538-4357-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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