Investigating jet physical properties of Fermi blazars with broad-line emissions

Relativistic outflows often exhibit extreme observational characteristics due to beaming effects, which makes measuring their jet power a challenging task. Although the spectral energy distribution (SED) obtained from multi-wavelength data can constrain the physical parameters of these jets, accurately estimating the Doppler factor remains difficult. To address this challenge, we assemble a comprehensive sample containing available SEDs of synchrotron and inverse Compton (IC) components, monochromatic luminosity, and broad-line region (BLR) emissions. We employ a parabolic equation to fit the synchrotron radiation SEDs, constraining jet physical parameters within the framework of a one-zone leptonic model. Our study delves into the jet properties and Doppler factor estimations, yielding the following key findings: (1) The fitting results of SED data for the entire sample reveal normal distributions of jet physical parameters for two subclasses of blazars. (2) Correlation analysis demonstrates that synchrotron peak luminosity exhibits a proportional relationship with both the radio and the γ -ray luminosities. (3) We introduce a novel method for estimating Doppler factors, which uncovers discrepancies between Doppler factors from this work and others from different techniques.