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Session 58 - Gamma Rays & Cosmic Rays.
Oral session, Tuesday, January 16
Salon del Rey South, Hilton
We report 0.03--1.8 MeV fluxes and spectra of the nearby radio galaxy Centaurus A (NGC 5128), the Seyfert galaxy NGC 4151, and the bright QSO 3C 273, during available \Cgro\ viewing periods from 1991--1994, using earth-occultation data from the Burst and Transient Source Experiment (BATSE). For Cen A, based on 15 viewing periods available initially, the average of the preliminary 45--140 keV fluxes was \approx1.4\times10^-2 \Gcs, with variability of about a factor of two; the mean flux in the 0.5--1.0 MeV range was about 1.6\times10^-3, with evidence for variability. The spectra obtained during most single viewing periods are adequately represented by power-laws dN/dE = AE^-\alpha, with photon indices \alpha ranging from approximately 1.5 to 2.2.
Program listing for Tuesday