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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 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 emitting region, black hole mass estimation, etc. It is noticed that in
general blazars show intra-day variability in the complete electromagnetic
spectrum. But some class of blazars either do not show or show very little
intra-day variability in a specific band of electromagnetic spectrum. Blazars
show rarely quasi-periodic oscillations in time series data in optical and
X-ray bands. Other properties and emission mechanism of blazars are also
briefly discussed.Comment: Invited Review; Submitted to Galaxies; a special issue on
Microvariability of Blazar
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