Abstract:
Blazar CTA 102 experienced an intense multiwavelength activity phase from 2015 to 2018; in particular, an
unprecedented outburst was observed from 2016 October to 2017 February. In this work, we extract a 7 day binned
γ-ray light curve from 2008 August to 2018 March in the energy range 0.1–300 GeV and identify three main outbursts.
We study in detail the short-timescale variability of these three outbursts via an exponential function with parameterized
rise and decay timescales. The obtained shortest rise and decay timescales are 0.70 ± 0.05 hr and 0.79 ± 0.27 hr,
respectively. Based on these variability timescales, the physical parameters of the flaring region (e.g., the minimum
Doppler factor and the emission region size) are constrained. The short-timescale flares exhibit a symmetric temporal
profile within the error bars, implying that the rise and decay timescales are dominated by the light-crossing timescale or
by disturbances caused by dense plasma blobs passing through the standing shock front in the jet region. We also find
that the best-fitting form of the γ-ray spectra during the flare period is a power law with an exponential cutoff. The
derived jet parameters from the spectral behavior and the temporal characteristics of the individual flares suggest that the
γ-ray emission region is located upstream of the radio core. The extreme γ-ray flare of CTA 102 is likely to have been
caused by magnetic reconnection.
