Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..156c&link_type=abstract
Astrophysical Journal v.452, p.156
Astronomy and Astrophysics
Astronomy
74
Galaxies: Active, Gamma Rays: Observations, Galaxies: Quasars: General
Scientific paper
During the period from the launch of the Compton Observatory in 1991 April through 1993 September, the Energetic Gamma-Ray Experiment Telescope (EGRET) has detected, with high significance (>5σ), 33 blazar-type QSOs which are sources of high-energy gamma-rays and another eight which show strong evidence for high-energy gamma-ray emission. Many of the gamma-ray loud blazars have redshifts z ˜ 1 with the most distant source having a redshift of z = 2.2. The V/VMAX test has been applied to the sample of gamma-ray loud AGNs seen during the phase I and II observing periods, and evidence for the evolution of these sources consistent with pure luminosity evolution is presented. The effects of observational biases due to gamma-ray flux-detection limits and optical identifications are considered. Using the Ve/Va test, we find the parameters describing the evolution, and by de-evolving the sample, we make an estimate of the luminosity function of these objects. Finally, using this luminosity function, we make an estimate of the gamma-ray loud AGN contribution to the diffuse extragalactic emission.
Chiang James
Fichtel Carl E.
Nolan Patrick Lee
Petrosian Vahe
von Montigny C.
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