Articles written in Journal of Astrophysics and Astronomy
Volume 35 Issue 3 September 2014 pp 237-240 Part II: Blazar Observations in Infrared and Optical
We have studied the correlations between luminosities (𝐿R, 𝐿IR, 𝐿𝛾) in the radio, near-infrared and 𝛾-ray wave bands for HSP TeV BL Lacs. The results show that there are significant intrinsic correlations between 𝐿R and 𝐿𝛾 and between 𝐿IR and 𝐿𝛾 in all states (high/average/low), and suggest that for HSP TeV BL Lacs, the Synchrotron Self-Compton radiation (SSC) is the main mechanism of high energy 𝛾-ray emission, and the inverse Compton scattering of circum-nuclear dust is likely to be an important complementary mechanism.
Volume 35 Issue 3 September 2014 pp 279-281 Posters
From a large volume of literature, we have collected effective observation of BL Lac object S5 0716+714 in the optical band, and constructed its long-term light curve from 1994 to 2006 AD. The light curve shows that S5 0716+714 is very active and exhibits very complicated non-sinusoidal variations. We used Period04 to analyse the period of light curve variation. Our results show that for S5 0716+714, the long-term period of variation is 3.3 yr which is consistent with the result of Raiter
Volume 35 Issue 3 September 2014 pp 333-335 Posters
We collected the radio, K-band, optical, X-ray, and 𝛾-ray data for 35 TeV blazars detected by Fermi LAT and studied the possible correlation between different broad band spectral indices (𝛼r.o, 𝛼r.x, 𝛼ir.o, 𝛼ir.x, 𝛼o.𝛾, 𝛼x.𝛾) in all states (average/high/low). Based on our results, we suggested that the seed photons of the 𝛾-ray drive from the synchrotron radiation themselves.
Volume 35 Issue 3 September 2014 pp 345-347 Posters
Using 𝛾-ray band data detected by Fermi Large Area Telescope (LAT) and X-ray band data for 78 blazars, we find a medium correlation between X-ray and 𝛾-ray fluxes in the average state. A medium anticorrelation is also found between X-ray (1 KeV) mean spectral index 𝛼𝑥 and 𝛾-ray mean spectral index 𝛼𝛾 for blazars. Our results suggest that the most likely radiation mechanism for the high energy 𝛾-ray would be SSC. And that the 𝛾-ray emission mechanism may be somewhat different for BL Lacs and FSRQs.
Volume 35 Issue 3 September 2014 pp 381-383 Posters
We have collected a sample of 71 𝛾-ray blazars selected from the Fermi LAT Bright AGN Sample (LBAS). The correlation between synchrotron peak luminosities 𝐿p and synchrotron peak frequencies 𝑣p have been studied and there is a weak negative correlation. But after correcting the effect of redshift and Doppler boosting, the relation between intrinsic 𝐿'p and 𝑣'p show significant positive correlation.
Volume 35 Issue 3 September 2014 pp 489-493 Posters
BL Lacertae is one of the famous AGN that shows convincing evidence to support periodic variability. We compile R-band data and radio 22 GHz database from the available literature to build the light curves and to calculate broad-band spectral indices. This paper employs the wavelet periodic estimation method. The analysis results indicate that the most possible period is 7.02–7.36 yr in the selected wave-bands. The broad-band spectral indices have a possible period of 4.11 yr as a half value in selected wave-bands. The results confirm that the variability period in the radio 22 GHz is in agreement with the optical R band of about 7.01 yr, as also mentioned in other literatures.
Volume 40 | Issue 5
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