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- W4323670553 abstract "The evolution of the spectral energy distribution during flares constrains models of particle acceleration in blazar jets. The archetypical blazar BL Lac provided a unique opportunity to study spectral variations during an extended strong flaring episode from 2020-2021. During its brightest $gamma$-ray state, the observed flux (0.1-300 GeV) reached up to $2.15,times,10^{-5},rm{ph,cm^{-2},s^{-1}}$, with sub-hour scale variability. The synchrotron hump extended into the X-ray regime showing a minute-scale flare with an associated peak shift of inverse-Compton hump in gamma-rays. In shock acceleration models, a high Doppler factor value $>$100 is required to explain the observed rapid variability, change of state, and $gamma$-ray peak shift. Assuming particle acceleration in mini-jets produced by magnetic reconnection during flares, on the other hand, alleviates the constraint on required bulk Doppler factor. In such jet-in-jet models, observed spectral shift to higher energies (towards TeV regime) and simultaneous rapid variability arises from the accidental alignment of a magnetic plasmoid with the direction of the line of sight. We infer a magnetic field of $sim0.6,rm{G}$ in a reconnection region located at the edge of BLR ($sim0.02,rm{pc}$). The scenario is further supported by log-normal flux distribution arising from merging of plasmoids in reconnection region." @default.
- W4323670553 created "2023-03-10" @default.
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- W4323670553 date "2023-02-14" @default.
- W4323670553 modified "2023-09-26" @default.
- W4323670553 title "Flaring activity from magnetic reconnection in BL Lacertae" @default.
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- W4323670553 doi "https://doi.org/10.1093/mnrasl/slad023" @default.
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