Observation of high-energy gamma rays from the quasi-stellar object CTA 102

Details Observation of high-energy gamma rays from the quasi-stellar object CTA 102 Observation of high-energy gamma rays from the quasi-stellar object CTA 102

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414...82n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 82-85.

Other

32

Blazars, Gamma Ray Telescopes, High Energy Interactions, Quasars, Red Shift, Gamma Ray Observatory, Linear Polarization, Very Large Array (Vla)

Scientific paper

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 GRO satellite. In the 1992 January 23-February 6 observation, emission was detected at the level (2.4 +/- 0.5) x 10 exp 7 photons/sq cm s (E is greater than 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 +/- 0.2, the softest so far observed by EGRET. The emitted gamma-ray luminosity, if isotropic, is 5 x 10 exp 47 ergs/s (H(0) = 75 km/s Mpc , q(0) = 0.5), although there are good reasons to believe that the gamma emission is strongly beamed.

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