2019/02/27 by Xiao, Hubing, Fan, Junhui, Yang, Jianghe +8
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · doi:10.48550/arxiv.1902.10764
Active galactic nuclei (AGNs) have been attracting research attention due to their special observable properties. Specifically, a majority of AGNs are detected by Fermi-LAT missions, but not by Fermi-LAT, which raises the question of whether any differences exist between the two. To answer this issue, we compile a sample of 291 superluminal AGNs (189 FDSs and 102 non-FDSs) from available multi-wavelength radio, optical, and X-ray (or even γ-ray) data and Doppler factors and proper motion (μ) (or apparent velocity (β_\rmapp)); calculated the apparent velocity from their proper motion, Lorentz factor (Γ), viewing angle (ϕ) and co-moving viewing angle (ϕco) for the sources with available Doppler factor (δ); and performed some statistical analyses for both types. Our study indicated that1. In terms of average values, FDSs have higher proper motions (μ), apparent velocities (β\rm app), Doppler factor (δ), Lorentz factor (Γ), and smaller viewing angle (ϕ). Nevertheless, there is no clear difference in co-moving viewing angles (ϕ\rm co).