NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-23 T03:30:14 PDT
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For refcode 2005ApJ...622..129S:
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...622..129S Lag-Luminosity Relationship for Interband Lags between Variations in B, V, R, and I Bands in Active Galactic Nuclei S. G. Sergeev, V. T. Doroshenko, Yu. V. Golubinskiy, N. I. Merkulova, and E. A. Sergeeva Abstract. We determine interband lags between variations in the B band and variations in the V, R, and I bands for 14 active galactic nuclei observed at the Crimean Astrophysical Observatory. The computed lags range from tenths of a day to several days, and it is positive (that is, V, R, and I bands lag behind the B band) in most cases, except for a few cases for the V filter. In some cases, the lag is greater than zero, with more than 3 {sigma} confidence. The lag is systematically less for the V filter than for the red filters, and the lag determined from the cross-correlation function (CCF) centroid is systematically greater than the lag determined from the CCF peak. We find that the lag scales with luminosity as L^b^, where b~0.4 - 0.5. We attribute this lag to the light time travel effect, so it reflects the geometrical size of the region that emits optical continuum. We consider a model in which optical emission is mainly reprocessed emission that arises in the accretion disk heated by an X-ray source above the disk. Keywords: Galaxies: Active, Galaxies: Nuclei, Galaxies: Photometry, Galaxies: Seyfert
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