<h2>Observations of High-Energy Gamma Rays 
from the QSO CTA 102</h2>
<h3>ApJ, 414, 82 (1993)</h3>
The quasar CTA 102 (QSO 2230+114) was observed four times in 1991-1992
by the EGRET high-energy gamma ray telescope on the Compton Gamma
Ray Observatory satellite.  In the 1992 January 23 -- February 6 
observation, emission was detected at the level $(2.4 \pm 0.5) 
\times 10^{-7}$ $\rm photons\,cm^{-2}\,s^{-1}$ ($\rm E>100$ MeV).
The other observations produced upper limits or detections
with lower significance which are consistent with the same flux.
The photon spectrum can be represented by a power law with
a number index of $2.6 \pm 0.2$, the softest so far observed
by EGRET.  The emitted gamma ray luminosity, if isotropic, is 
$5 \times 10^{47} \rm erg\,s^{-1}$ 
($\rm H_0=75\,km\,s^{-1}\,Mpc^{-1}$, $\rm q_0=0.5$), 
although there are good reasons to believe that the gamma emission 
is strongly beamed.

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 Parent Directory        17-Jun-2002 09:12      -  
 cta102.ps.Z             01-Sep-1995 16:53    41k  Postscript file
 cta102.tex              05-Sep-1995 11:14    17k  TeX file
 fig1.ps                 01-Sep-1995 16:53     5k  Postscript file
 fig2.ps                 01-Sep-1995 16:53    28k  Postscript file
 fig3.ps                 01-Sep-1995 16:53    16k  Postscript file