D. X. Wu
Articles written in Journal of Astrophysics and Astronomy
Volume 35 Issue 3 September 2014 pp 231-235 Part II: Blazar Observations in Infrared and Optical
The most identified sources observed by Fermi/LAT are blazars, based on which we can investigate the emission mechanisms and beaming effect in the 𝛾-ray bands for blazars. Here, we used the compiled around 450 Fermi blazars with the available X-ray observations to estimate their Doppler factors and compared them with the integral 𝛾-ray luminosity in the range of 1–100 GeV. It is interesting that the integral 𝛾-ray luminosity is closely correlated with the estimated Doppler factor, log 𝑣𝛾 𝐿𝑣𝛾 = (2.95 ± 0.09) log 𝛿 + 43.59 ± 0.08 for the whole sample. When the dependence of the correlation between them and the X-ray luminosity is removed, the correlation is still strong, which suggests that the 𝛾-ray emissions are strongly beamed.
Volume 35 Issue 3 September 2014 pp 353-355 Posters
The most identified sources observed by Fermi are blazars (Flat Spectrum Radio Quasars (FSRQs) and BL Lacertae objects (BLs). In this paper, we obtained 124 𝛾-ray loud blazars with available 𝛾-ray and radio (core and total) data. It is interesting that the 𝛾-ray luminosity have a good correlation with the radio luminosity. This phenomenon exists in the core radio luminosity (𝐿c) and total radio luminosity (𝐿t). The correlation between the 𝛾-ray and the radio luminosities is still stronger even after we eliminated the redshift effect, which suggests that the 𝛾-ray radiations in the 𝛾-ray loud blazars are strongly beamed.
Volume 35 Issue 3 September 2014 pp 467-469 Posters
In this paper, we compiled 572 blazars that have known core dominance parameter (log 𝑅), out of which 121 blazars are 𝛾-ray loud blazars. We compared log 𝑅 between 121 blazars and the rest with non 𝛾-ray detections, and found that 𝛾-ray loud blazars showed a different distribution, and their average value of log 𝑅 is greater than that for non 𝛾-ray blazars. Our analysis suggests that the 𝛾-ray emissions are strongly beamed.
Volume 35 Issue 3 September 2014 pp 485-486 Posters
Relativistic beaming effect is important for blazars. In a very recent work, 𝛾-ray Doppler factors were calculated for a sample of Fermi blazars (Fan
Volume 40 | Issue 6
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