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Detection of Time Lags between Quasar Continuum Emission Bands Based On Pan-STARRS Light Curves

Author(s): Jiang, Yan-Fei; Green, Paul J; Greene, Jenny E.; Morganson, Eric; Shen, Yue; et al

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dc.contributor.authorJiang, Yan-Fei-
dc.contributor.authorGreen, Paul J-
dc.contributor.authorGreene, Jenny E.-
dc.contributor.authorMorganson, Eric-
dc.contributor.authorShen, Yue-
dc.contributor.authorPancoast, Anna-
dc.contributor.authorMacLeod, Chelsea L-
dc.contributor.authorAnderson, Scott F-
dc.contributor.authorBrandt, WN-
dc.contributor.authorGrier, CJ-
dc.contributor.authorRix, H-W-
dc.contributor.authorRuan, John J-
dc.contributor.authorProtopapas, Pavlos-
dc.contributor.authorScott, Caroline-
dc.contributor.authorBurgett, WS-
dc.contributor.authorHodapp, KW-
dc.contributor.authorHuber, ME-
dc.contributor.authorKaiser, N-
dc.contributor.authorKudritzki, RP-
dc.contributor.authorMagnier, EA-
dc.contributor.authorMetcalfe, N-
dc.contributor.authorTonry, JT-
dc.contributor.authorWainscoat, RJ-
dc.contributor.authorWaters, C-
dc.identifier.citationJiang, Yan-Fei, Green, Paul J, Greene, Jenny E, Morganson, Eric, Shen, Yue, Pancoast, Anna, MacLeod, Chelsea L, Anderson, Scott F, Brandt, WN, Grier, CJ, Rix, H-W, Ruan, John J, Protopapas, Pavlos, Scott, Caroline, Burgett, WS, Hodapp, KW, Huber, ME, Kaiser, N, Kudritzki, RP, Magnier, EA, Metcalfe, N, Tonry, JT, Wainscoat, RJ, Waters, C. (2017). Detection of Time Lags between Quasar Continuum Emission Bands Based On Pan-STARRS Light Curves. ASTROPHYSICAL JOURNAL, 836 (10.3847/1538-4357/aa5b91en_US
dc.description.abstractWe study the time lags between the continuum emission of quasars at different wavelengths, based on more than four years of multi-band (g, r, i, z) light curves in the Pan-STARRS Medium Deep Fields. As photons from different bands emerge from different radial ranges in the accretion disk, the lags constrain the sizes of the accretion disks. We select 240 quasars with redshifts of. z approximate to 1 or z approximate to 0.3 that are relatively emission-line free. The light curves are sampled from day to month timescales, which makes it possible to detect lags on the scale of the light crossing time of the accretion disks. With the code JAVELIN, we detect typical lags of several days in the rest frame between the g band and the riz bands. The detected lags are similar to 2-3 times larger than the light crossing time estimated from the standard thin disk model, consistent with the recently measured lag in NGC 5548 and microlensing measurements of quasars. The lags in our sample are found to increase with increasing luminosity. Furthermore, the increase in lags going from g - r to g - i and then to g - z is slower than predicted in the thin disk model, particularly for high-luminosity quasars. The radial temperature profile in the disk must be different from what is assumed. We also find evidence that the lags decrease with increasing line ratios between ultraviolet Fe II lines and Mg II, which may point to changes in the accretion disk structure at higher metallicity.en_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.titleDetection of Time Lags between Quasar Continuum Emission Bands Based On Pan-STARRS Light Curvesen_US
dc.typeJournal Articleen_US

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