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Observation of high-energy gamma rays from the quasi-stellar object CTA 102
- Source :
- Astrophysical Journal, Part 1. 414(1)
- Publication Year :
- 1993
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1993.
-
Abstract
- 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.
- Subjects :
- Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 414
- Issue :
- 1
- Database :
- NASA Technical Reports
- Journal :
- Astrophysical Journal, Part 1
- Notes :
- NAG5-1742, , BMFT-50-QV-9065, , NAS5-31210, , NAG5-1605
- Publication Type :
- Report
- Accession number :
- edsnas.19930071236
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1086/173058