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

作　　者：Lixia Zhang Jianghe Yang Yi Liu Junhui Fan 

机构地区：[1]Center for Astrophysics,Guangzhou University,Guangzhou 51006,China [2]Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province,Guangzhou 510006,China [3]Key Laboratory for Astronomical Observation and Technology of Guangzhou,Guangzhou 510006,China [4]Great Bay Center,National Astronomical Data Center,Guangzhou 510006,China [5]Department of Physics and Electronics Science,Hunan University of Arts and Science,Changde 415000,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第10期138-154,共17页中国科学：物理学、力学、天文学（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Grant No.12303018);supported by the National Natural Science Foundation of China(Grant Nos.U2031201,11733001,and U2031112).;the science research grants from the China Manned Space Project with(Grant No.CMSCSST-2021-A06);Scientific and Technological Cooperation Projects(20202023)between China and the Republic of Bulgaria。

摘　　要：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.

关 键 词：active galactic nuclei BLAZARS jets spectral energy distribution 

分 类 号：P157.6[天文地球—天文学]