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Optical variability of TeV blazars on long time-scales

Show simple item record Gaur, Haritma Gupta, Alok C Bachev, R. 2023-10-30T09:51:32Z 2023-10-30T09:51:32Z 2019-02
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1371
dc.description.abstract We present the results of photometric observations of three TeV blazars, 3C 66A, S4 0954+658, and BL Lacertae (BL Lac), during the period 2013–2017. Our extensive observations were performed in a total of 360 nights which produced ∼6820 image frames in BVRI bands. We study flux and spectral variability of these blazars on these lengthy time-scales. We also examine the optical spectral energy distributions of these blazars, which are crucial in understanding the emission mechanism of long-term variability in blazars. All three TeV blazars exhibited strong flux variability during our observations. The colour variations are mildly chromatic on long time-scales for two of them. The nature of the long-term variability of 3C 66A and S4 0954+658 is consistent with a model of a non-thermal variable component that has a continuous injection of relativistic electrons with power-law distributions around 4.3 and 4.6, respectively. However, the long-term flux and colour variability of BL Lac suggests that these can arise from modest changes in velocities or viewing angle toward the emission region, leading to variations in the Doppler boosting of the radiation by a factor of ∼1.2 over the period of these observations. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 1473;mnras484-5633
dc.subject galaxies: active; BL Lacertae objects: general; galaxies: photometry; quasars: individual: 3C 66A; quasars: individual: S4 0954+658; quasars: individual: BL Lac en_US
dc.title Optical variability of TeV blazars on long time-scales en_US
dc.type Article en_US

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