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dc.contributor.authorLi, Jennifer
dc.contributor.authorShen, Yue
dc.contributor.authorHorne, Keith
dc.contributor.authorBrandt, W. N.
dc.contributor.authorGreene, Jenny E.
dc.contributor.authorGrier, C. J.
dc.contributor.authorHo, Luis C.
dc.contributor.authorKochanek, Chris
dc.contributor.authorSchneider, Donald P.
dc.contributor.authorTrump, Jonathan R.
dc.contributor.authorDawson, Kyle S.
dc.contributor.authorPan, Kaike
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorOravetz, Daniel
dc.contributor.authorSimmons, Audrey
dc.contributor.authorMalanushenko, Elena
dc.identifier.citationLi , J , Shen , Y , Horne , K , Brandt , W N , Greene , J E , Grier , C J , Ho , L C , Kochanek , C , Schneider , D P , Trump , J R , Dawson , K S , Pan , K , Bizyaev , D , Oravetz , D , Simmons , A & Malanushenko , E 2017 , ' The Sloan Digital Sky Survey Reverberation Mapping project : composite lags at z ≤ 1 ' , Astrophysical Journal , vol. 846 , no. 1 , 79 .
dc.identifier.otherPURE: 251117170
dc.identifier.otherPURE UUID: 27e0b85c-310d-40e2-b964-8d446f8382cf
dc.identifier.otherWOS: 000409019800010
dc.identifier.otherScopus: 85029098465
dc.identifier.otherWOS: 000409019800010
dc.descriptionFunding: STFC grant ST/M001296/1 (KH).en
dc.description.abstractWe present composite broad-line region (BLR) reverberation mapping lag measurements for Hα, Hβ, He II λ4686, and Mg II for a sample of 144, z ≲ 1 quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Using only the 32-epoch spectroscopic light curves in the first six-month season of SDSS-RM observations, we compile correlation function measurements for individual objects and then coadd them to allow the measurement of the average lags for our sample at mean redshifts of 0.4 (for Hα) and ∼0.65 (for the other lines). At similar quasar luminosities and redshifts, the sample-averaged lag decreases in the order of Mg II, Hα, Hβ, and He II. This decrease in lags is accompanied by an increase in the mean line width of the four lines, and is roughly consistent with the virialized motion for BLR gas in photoionization equilibrium. These are among the first RM measurements of stratified BLR structure at z > 0.3. Dividing our sample by luminosity, Hα shows clear evidence of increasing lags with luminosity, consistent with the expectation from the measured BLR size-luminosity relation based on Hβ. The other three lines do not show a clear luminosity trend in their average lags due to the limited dynamic range of luminosity probed and the poor average correlation signals in the divided samples, a situation that will be improved with the incorporation of additional photometric and spectroscopic data from SDSS-RM. We discuss the utility and caveats of composite lag measurements for large statistical quasar samples with reverberation mapping data
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2017, The American Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at /
dc.subjectBlack hole physicsen
dc.subjectGalaxies: activeen
dc.subjectLine: profilesen
dc.subjectQuasars: generalen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe Sloan Digital Sky Survey Reverberation Mapping project : composite lags at z ≤ 1en
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.The University of St Andrewsen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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