Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..583d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 583-595.
Astronomy and Astrophysics
Astronomy
186
Radiation Mechanisms: Nonthermal, Galaxies: Active, Bl Lacertae Objects: General, Quasars: General, Gamma-Rays: Theory, X-Rays: General
Scientific paper
We study the entire sample of quasars detected above 100 MeV (by the EGRET instrument), on board CGRO. We find that the gamma-ray luminosity correlates better with the radio luminosity than with the optical or X-ray luminosity, even if the different variability behaviour indicates different emission regions. A strong correlation is also found between the broad-band spectral indices alpha_ro, connecting the radio and the optical fluxes, and alpha_ogamma, connecting the optical and the gamma-ray fluxes. The gamma-ray luminosity in BLLac objects is on average much less dominant than in the other sources. With the requirement that the gamma-rays do not interact with X-rays (assumed cospatial) through photon-photon collisions, we calculate the lower limit on the Doppler or beaming factor of the gamma-ray emission region for a large fraction of the sources of the sample, finding that relativistic motion is required in all cases.
Dondi Laura
Ghisellini Gabriele
No associations
LandOfFree
Gamma-ray-loud blazars and beaming 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 Gamma-ray-loud blazars and beaming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-ray-loud blazars and beaming will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1830317