Long-term BVR I monitoring of PKS 2155-304 finds significant multi-timescale variability, spectral hardening, a 2023 flare, weak optical-X-ray correlations, and no significant short-term quasi-periodicity once red noise is modelled.
Optical microvariability of EGRET blazars
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abstract
We present results of a photometric CCD study of the incidence of microvariability in the optical emission of a sample of 20 blazars detected at gamma-ray energies by the EGRET instrument of the Compton Gamma-Ray Observatory. We have observed strong outbursts in some sources, but many others displayed no significant variability on timescales of hours. The typical minimum timescale results to be of ~ several hours, not tens of minutes as claimed by some authors. The duty cycle for optical intranight microvariations of gamma-ray blazars, as estimated from our observations, seems to be ~50%, lower than what is usually assumed. For night-to-night variations, instead, the duty cycle approaches to what is observed in radio-selected BL Lacs and flat-spectrum radio quasars (i.e. ~70%).
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PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis
Long-term BVR I monitoring of PKS 2155-304 finds significant multi-timescale variability, spectral hardening, a 2023 flare, weak optical-X-ray correlations, and no significant short-term quasi-periodicity once red noise is modelled.