Long-term 0.03-1.8MeV BATSE monitoring of Centaurus A.

Details Long-term 0.03-1.8MeV BATSE monitoring of Centaurus A. Long-term 0.03-1.8MeV BATSE monitoring of Centaurus A.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.545w&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.545-548

Astronomy and Astrophysics

Astrophysics

8

Gamma Rays: Observations, Galaxies: Active, Galaxy: Individual: Ngc 5128

Scientific paper

We report the 0.03-1.8MeV spectra of the nearby radio galaxy Centaurus A (NGC 5128) during 15 Compton Gamma-Ray Observatory viewing periods from 1991 May through 1992 June, using data from the Burst and Transient Source Experiment and the earth-occultation method. During these periods the average of the 45-140keV flux was =~1.5x10^-2gammacm^-2^/s, with variability of a factor of two or less. The mean flux in the 0.5-1.0MeV range was about 1.5x10^-3gammacm^-2^/s, with evidence for variability. The spectra obtained during most single viewing periods are adequately represented by power-laws dN/dE=AE^-α^, with a mean photon index <α>=1.84+/-0.08, and RMS variability of at most 0.3.

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