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On the narrow spectral feature at sim3 TeV in the MAGIC spectrum of Mrk 501

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arxiv 2108.10468 v1 pith:7NUK22TH submitted 2021-08-24 astro-ph.HE hep-ph

On the narrow spectral feature at sim3 TeV in the MAGIC spectrum of Mrk 501

classification astro-ph.HE hep-ph
keywords branchaccelerationspectralfeaturenarrowpileupdistributionenergy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using a time-dependent one-zone leptonic model that incorporates both shock acceleration and stochastic acceleration processes, we investigate the formation of the narrow spectral feature at $\sim3$ TeV of Mrk 501 which was observed during the X-ray and TeV flaring activity in July 2014. It is found that the broadband spectral energy distribution (SED) can be well interpreted as the synchrotron and synchrotron-self-Compton emission from the electron energy distribution (EED) that is composed by a power-law (PL) branch and a pileup branch. The PL branch produces synchrotron photons which are scattered by the electrons of the pileup branch via inverse-Compton scattering and form the narrow spectral feature observed at the TeV energies. The EED is produced by two injection episodes, and the pileup branch in EED is caused by shock acceleration rather than stochastic acceleration.

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