Model for the Redshift and Luminosity Distributions of Gamma-Ray
Blazars
C. Dermer
S. P. Davis
Abstract
A simple model is used to fit the redshift and luminosity distributions of
gamma-ray blazars observed with EGRET. The model consists of collimated
relativistic plasma
outflows with radiation beamed along the jet axis due to Doppler boosting.
The EGRET detection sensitivity
is used to assess source detectability, and a range of Doppler
factors and intrinsic source luminosities are used to fit the distributions.
We consider
beaming factors appropriate to synchrotron self-Compton and external Compton
scattering scenarios.
The integrated background radiation is used to constrain the distributions
of source properties.
Predictions for the detectability of blazars with GLAST are made. In
particular, we argue that
GLAST will see a much larger fraction of BL Lacs in its sample than seen by
EGRET, in consequence
of the stronger cosmological effects on detectability of the more distant
flat spectrum quasars.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.