Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61..639f&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.61, No.4, pp.639--643
Astronomy and Astrophysics
Astronomy
9
Galaxies: Active-Galaxies: Jets, Galaxies: Bl Lacertae Objects: General, Galaxies: Quasars: General
Scientific paper
In this paper, using a database of the University of Michigan Radio Astronomy Observatory at the radio frequencies (8GHz and 14.5GHz), we determined the variability time scales, and calculated the brightness temperature for 86 radio sources (29 BL Lacertae objects-BLs and 57 flat spectrum radio quasars-FSRQs). The time scales were found in the range of from 3 months to 16.27 years with an averaged value scale of 2.34 years. We obtained the following results: (1) The brightness temperature is in the range of log Tb,var = 10.98 to Tb,var = 15.35, which suggests that the Doppler factors are in the range of δ = 0.73 to δ = 20.74. The averaged values are <δ> = 5.95±2.93 for 57 FSRQs and <δ> = 5.08±2.63 for 29 BLs. (2) The radio luminosity, Lob, is found to be correlated with the radio Doppler factor, δ, log Lob = (0.58±0.10) logδ3 + 43.49±0.21. (3) The viewing angles and the Lorentz factors were determined for 53 sources (15 BLs and 38 FSRQS) with available superluminal velocity (Zhang & Fan 2008, Chin. J. Astron. Astrophys, 8, 385). The averaged values are Γ = 24.1±17.35 and θ = 8.7D±3.5D for the FSRQs, and Γ = 13.5±11.16 and θ = 12°±7° for the BLs.
Fan Jun-Hui
He Tang-Mei
Hua Tong Xu
Huang Yong
Liu Yi
No associations
LandOfFree
Radio Variability and Relativistic Beaming Effect for Blazars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radio Variability and Relativistic Beaming Effect for Blazars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Variability and Relativistic Beaming Effect for Blazars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1300122