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      http://www.ias.ac.in/article/fulltext/joaa/036/04/0475-0493

    • Keywords

       

      Galaxies: active; galaxies: individual: 3C 390.3, Arp 102B, NGC 5548, NGC 4051 and E1821+643; methods: statistical; line profiles.

    • Abstract

       

      Here we investigate light curves of the continuum and emission lines of five type 1 active galactic nuclei (AGN) from our monitoring campaign, to test time-evolution of their time delays. Using both modeled and observed AGN light curves, we apply Gaussian kernel-based estimator to capture variation of local patterns of their time evolving delays. The largest variations of time delays of all objects occur in the period when continuum or emission lines luminosity is the highest. However, Gaussian kernel-based method shows instability in the case of NGC 5548, 3C 390.3, E1821+643 and NGC 4051 possibly due to numerical discrepancies between damped random walk (DRW) time scale of light curves and sliding time windows of the method. The temporal variations of time lags of Arp 102B can correspond to the real nature of the time lag evolution.

    • Author Affiliations

       

      A. Kovačević1 L. Č. Popović2 A. I. Shapovalova3 D. Ilić1 A. N. Burenkov3 V. H. Chavushyan4

      1. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia.
      2. Astronomical Observatory Belgrade, Volgina 7, 11060 Belgrade, Serbia.
      3. Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz, Karachaevo - Cherkesia 369167, Russia.
      4. Instituto Nacional de Astrofísica, Óptica y Electrónica, Apartado Postal 51y 216, 72000 Puebla, México.
    • Dates

       
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