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Paper: Comparison of Radio and EGRET γ-ray Properties between BL Lacs and other AGN
Volume: 159, BL Lac Phenomenon
Page: 213
Authors: Lähteenmäki, A.; Valtaoja, E.
Abstract: We have compared EGRET Phase 1+2+3 gamma-ray data with Mets=E4hovi radio monitoring data of AGN at 22 and 37 GHz. The most probable gamma-ray AGN to be detected is a high polarization quasar (HPQ) with an ongoing and rising high frequency radio flare and a large associated variability brightness temperature T(b,var) (or Doppler boosting factor D). BL Lacs have a low detection rate compared even to 'non-blazar', low polarization quasars (LPQs). The detection probability depends on T(b,var) and, during a single EGRET pointing, the phase of the radio flare. The strength of the gamma-ray emission depends also on T(b,var) and on the strength of the radio flare. The gamma-ray properties of BL Lacs as well as other AGN are closely related both to the average radio properties and to the individual radio outbursts (shocks) growing in the source. Natural explanation is that the gamma emission is produced in the same shocks, induced by the synchrotron self-Compton mechanism.
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