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DOI: 10.1088/1538-3873/ac98e0

Variability and Spectral Behavior of Gamma-ray Flares of 3C 279

Gege WangJunhui FanHubing XiaoJinting Cai
Dec 2022
摘要
3C 279 showed enhanced flux variations in Fermi-LAT {\gamma}-ray observationsfrom January to June 2018. We present a detailed Fermi-LAT analysis toinvestigate the variability and spectral behaviors of 3C 279 during the{\gamma}-ray flares in 2018. In this work, we analyzed the {\gamma}-ray spectraand found that the spectra in either the flaring or quiescent states do notshow any clear breaks (or cutoffs). This indicates that the dissipation regionis outside the broad-line region, and the energy dissipation may be due to theinverse Compton process of scattering the dust torus infrared photons, thisresult is also consistent with that in Tolamatti et al. An external inverseCompton scattering of dusty torus (DT) photons is employed to calculate thebroadband spectral energy distribution (SED). This model was further supportedby the fact that we found flare decay timescale was consistent with the coolingtime of relativistic electrons through DT photons. During the SED modeling, arelatively harder spectrum for the electron energy distribution (EED) is foundand suggests these electrons may not be accelerated by the shock that happenedin the dissipation region. Besides, the magnetic reconnection is also ruled outdue to a low magnetization ratio. Thus, we suggest an injection ofhigher-energy electrons from outside the blob and raising the flare.
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