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Galaxies 2018, 6(1), 1; https://doi.org/10.3390/galaxies6010001

Multi-Wavelength Intra-Day Variability and Quasi-Periodic Oscillation in Blazars

Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263002, India
Received: 2 December 2017 / Revised: 15 December 2017 / Accepted: 19 December 2017 / Published: 25 December 2017
(This article belongs to the Special Issue Microvariability of Blazars)
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Abstract

We reviewed multi-wavelength blazars variability and detection of quasi-periodic oscillations on intra-day timescales. The variability timescale from a few minutes to up to less than a days is commonly known as intra-day variability. These fast variations are extremely useful to constrain the size of the emitting region, black hole mass estimation, etc. It is noticed that in general, blazars show intra-day variability in the complete electromagnetic spectrum. However, some classes of blazars either do not show or show very little intra-day variability in a specific band of the electromagnetic spectrum. Blazars show rarely quasi-periodic oscillations in time series data in optical and X-ray bands. Other properties and emission mechanisms of blazars are also briefly discussed. View Full-Text
Keywords: active galaxies; BL Lacertae object: BL Lac; quasars: flat spectrum radio quasars; jets, accretion disk active galaxies; BL Lacertae object: BL Lac; quasars: flat spectrum radio quasars; jets, accretion disk
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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Gupta, A.C. Multi-Wavelength Intra-Day Variability and Quasi-Periodic Oscillation in Blazars. Galaxies 2018, 6, 1.

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