1997/11/21 by Dong Jiang, D. R. Jiang, Xinwu Cao +1 · 1 citation
Physics and Astronomy · #Active galactic nucleus #Angular diameter #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Brightness #Brightness temperature #Classical mechanics #Doppler effect #Flux (metallurgy) #Galaxy #Gamma-ray bursts and supernovae #Jet (fluid) #Lorentz factor #Lorentz transformation #Luminosity #Mechanics #Physics #Proper motion #Radio Astronomy Observations and Technology #Relativistic beaming #Stars #Superluminal motion #Very-long-baseline interferometry #astro-ph
paper · pdf · doi:10.1086/305182
13 pages, 4 tables, 14 figures, AASTEX, to appear in ApJ
arxiv created 1997/11/21 · openalex publication_date 1998/02/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Königl inhomogeneous jet model is applied to investigate the properties of the jets in active galactic nuclei (AGNs). A sample of AGNs that includes measurements of the angular size and radio flux density of the VLBI core, proper motion of the components in the jet, and X-ray flux density is collected. The inhomogeneous jet parameters are derived with the same assumptions for all sources. A comparison among the parameters of different types of sources in the sample is presented. It is found that most of EGRET sources have higher Doppler factors δ, larger Lorentz factors γ, and smaller viewing angles θ as compared to the other sources in the sample. The statistical analyses show that the derived Doppler factor δ is strongly correlated with the observed 22 GHz brightness temperature. Furthermore, there is a correlation between the relative γ-ray luminosity and the Doppler factor δ. The implications of these results are discussed.