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Galaxies 2018, 6(1), 34; https://doi.org/10.3390/galaxies6010034

A Comparative Study of Multiwavelength Blazar Variability on Decades to Minutes Timescales

Astronomical Observatory of the Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
Received: 20 February 2018 / Revised: 28 February 2018 / Accepted: 2 March 2018 / Published: 8 March 2018
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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Abstract

Multiwavelength blazar variability is produced by noise-like processes with the power-law form of power spectral density (PSD). We present the results of our detailed investigation of multiwavelength ( γ -ray and optical) light curves covering decades to minutes timescales, of two BL Lac objects namely, PKS 0735+178 and OJ 287. The PSDs are derived using discrete Fourier transform (DFT) method. Our systematic approach reveals that OJ 287 is, on average, more variable than PKS 0735+178 at both optical and γ -ray energies on the corresponding time scales. On timescales shorter than ∼10 days, due to continuous and dense monitoring by the Kepler satellite, a steepening of power spectrum is observed for OJ 287. This indicates the necessity of an intermittent process generating variability on intra-night timescales for OJ 287. View Full-Text
Keywords: galaxies: active; BL Lacertae objects: individual (PKS 0735+178, OJ 287); variability galaxies: active; BL Lacertae objects: individual (PKS 0735+178, OJ 287); variability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Goyal, A. A Comparative Study of Multiwavelength Blazar Variability on Decades to Minutes Timescales. Galaxies 2018, 6, 34.

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