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dc.contributor.authorMacLeod, Chelsea L.
dc.contributor.authorRoss, Nicholas P.
dc.contributor.authorLawrence, Andy
dc.contributor.authorGoad, Mike
dc.contributor.authorHorne, Keith
dc.contributor.authorBurgett, William
dc.contributor.authorChambers, Ken C.
dc.contributor.authorFlewelling, Heather
dc.contributor.authorHodapp, Klaus
dc.contributor.authorKaiser, Nick
dc.contributor.authorMagnier, Eugene
dc.contributor.authorWainscoat, Richard
dc.contributor.authorWaters, Christopher
dc.identifier.citationMacLeod , C L , Ross , N P , Lawrence , A , Goad , M , Horne , K , Burgett , W , Chambers , K C , Flewelling , H , Hodapp , K , Kaiser , N , Magnier , E , Wainscoat , R & Waters , C 2016 , ' A systematic search for changing-look quasars in SDSS ' , Monthly Notices of the Royal Astronomical Society , vol. 457 , no. 1 , pp. 389-404 .
dc.identifier.otherRIS: urn:2F48E992874FA3374B32B4EA88F83A06
dc.descriptionCLM acknowledges support from the STFC Consolidated Grant (Ref. St/M001229/1). NPR acknowledges support from the STFC and the Ernest Rutherford Fellowship scheme. KH acknowledges support from STFC grant ST/M001296/1. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England.en
dc.description.abstractWe present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with repeat spectra from SDSS and SDSS-III Baryon Oscillation Spectroscopic Survey. Objects with large, |Δg| > 1 mag photometric variations in their light curves are selected as candidates to look for changes in broad emission line (BEL) features. Out of a sample of 1011 objects that satisfy our selection criteria and have more than one epoch of spectroscopy, we find 10 examples of quasars that have variable and/or ‘changing-look’ BEL features. Four of our objects have emerging BELs, five have disappearing BELs, and one object shows tentative evidence for having both emerging and disappearing BELs. With redshifts in the range 0.20 <z <0.63, this sample includes the highest redshift changing-look quasars discovered to date. We highlight the quasar J102152.34+464515.6 at z = 0.204. Here, not only have the Balmer emission lines strongly diminished in prominence, including Hβ all but disappearing, but the blue continuum fν∝ν1/3 typical of an active galactic nuclei is also significantly diminished in the second epoch of spectroscopy. Using our selection criteria, we estimate that >15 per cent of strongly variable luminous quasars display changing-look BEL features on rest-frame time-scales of 8 to 10 yr. Plausible time-scales for variable dust extinction are factors of 2–10 too long to explain the dimming and brightening in these sources, and simple dust reddening models cannot reproduce the BEL changes. On the other hand, an advancement such as disc reprocessing is needed if the observed variations are due to accretion rate changes.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectAccretion, accretion discsen
dc.subjectGalaxies: activeen
dc.subjectQuasars: emission linesen
dc.subjectQuasars: generalen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleA systematic search for changing-look quasars in SDSSen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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