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

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 o...

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Bibliographic Details
Published in:	Galaxies Vol. 6; no. 1; p. 1
Main Author:	Gupta, Alok
Format:	Journal Article
Language:	English
Published:	MDPI AG 25-12-2017
Subjects:	active galaxies BL Lacertae object: BL Lac jets, accretion disk quasars: flat spectrum radio quasars
Online Access:	Get full text
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Summary:	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.
ISSN:	2075-4434 2075-4434
DOI:	10.3390/galaxies6010001