Using 1,687 Fermi blazars, the paper reports a plateau in gamma-ray loudness at high synchrotron peak frequencies, interpreted as Klein-Nishina suppression yielding magnetic field constraints for HBLs.
Unification of BL Lac objects, FR I and FR II(G) radio galaxies and Doppler factor Estimation for BL Lac Objects
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abstract
In this work, we collected a sample of BL Lacs, FR I and FR II(G) radio galaxies with available core and extended emissions from published works to discuss the unified schemes and estimate the Doppler factor for BL Lacs. Wilcoxon rank-sum test and Kolmogorov-Smirnov test both suggest that the probabilities for the distribution of the extended luminosity of BL Lacs and that of FR I and FR II(G) radio galaxies to be from the same parent distribution are $p_{\rm{WRS}}=0.779$ and $p_{\rm{K-S}}=0.326$, suggesting they are unified. Based on this unified schemes, we propose to estimate the Doppler factors for BL Lacs. Comparing the Doppler factor estimated by the fitting/regression method with those for the common sources in the literatures, we found a good linear correlation for common sources.
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Radio-Gamma-Ray Properties and High-Energy Implications for Fermi Blazars
Using 1,687 Fermi blazars, the paper reports a plateau in gamma-ray loudness at high synchrotron peak frequencies, interpreted as Klein-Nishina suppression yielding magnetic field constraints for HBLs.