Upper limits to the annihilation radiation luminosity of Centaurus A

Details Upper limits to the annihilation radiation luminosity of Centaurus A Upper limits to the annihilation radiation luminosity of Centaurus A

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101...39g&link_type=abstract

In its NASA/Goddard Space Flight Center Contrib. to the Workshop on Positron-Electron Pairs in Astrophys. p 39-44 (SEE N83-2792

Astronomy and Astrophysics

Astrophysics

Galactic Radiation, Gamma Ray Astronomy, Gamma Rays, Luminosity, Positron Annihilation, Active Galaxies, Astrophysics, Galactic Nuclei, Gamma Ray Spectra, Heao, Photons

Scientific paper

A high resolution observation of the active nucleus galaxy Centaurus A (NGC 5128) was made by the GSFC low energy gamma-ray spectrometer (LEGS) during a balloon flight on 1981 November 19. The measured spectrum between 70 and 500 keV is well represented by a power law of the form 1.05 x 10 (-4) (E/100 keV) (-1.59) ph/sq cm /s with no breaks or line features observed. The 98% confidence (2 sigma) flux upper limit for a narrow ( 3 keV) 511-keV positron annihilation line is 9.9 x 10 (-4) ph/ sq cm /s. Using this upper limit, the ratio of the narrow-line annihilation radiation luminosity to the integral or = 511 keV luminosity is estimated to be 0.09 (2 sigma upper limit). This is compared with the measured value for our galactic center in the Fall of 1979 of 0.10 to 0.13, indicating a difference in he emission regions in the nuclei of the two galaxies.

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