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; E. A. Sergeeva

摘要

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 σ 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 Lb, 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.

机译：我们确定在克里米亚天体物理观测站观测到的14个活跃银河核的B波段变化与V，R和I波段变化之间的带间滞后。计算出来的滞后时间从一天的十分之一到几天不等，在大多数情况下，它是正值（即，V，R和I波段滞后于B波段），除了V滤波器的少数情况。在某些情况下，滞后大于零，置信度大于3σ。 V滤波器的滞后系统地比红色滤波器的滞后系统地小，并且由互相关函数（CCF）重心确定的滞后系统地大于从CCF峰确定的滞后。我们发现滞后与亮度成比例为Lb，其中b≈0.4-0.5。我们将此滞后归因于光时差效应，因此它反映了发出光学连续体的区域的几何尺寸。我们考虑一个模型，其中光发射主要是经过处理的发射，该发射是在圆盘上方的X射线源加热的吸积盘中产生的。

Lag-Luminosity Relationship for Interband Lags between Variations in B, V, R, and I Bands in Active Galactic Nuclei

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