M31 - an extragalactic source of 1000-GeV gamma rays

Details M31 - an extragalactic source of 1000-GeV gamma rays M31 - an extragalactic source of 1000-GeV gamma rays

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136l..14d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. L14, L15. Research supported by the Science and Engi

Astronomy and Astrophysics

Astronomy

6

Andromeda Galaxy, Gamma Ray Astronomy, Intergalactic Media, High Energy Interactions, Radiant Flux Density

Scientific paper

The Dugway array of γ-ray telescopes has been used to observe M31 at energies above 1000 GeV. An excess of γ-ray counts was seen from the direction of M31 with a conservative maximum likelihood significance of 1% to be due to a random fluctuation. The estimated flux of (2.2±0.7)×10-10 photon cm-2s-1 corresponds to a luminosity of 4×1040 erg s-1 for energies above 1000 GeV. The measured spatial distribution is consistent with the angular dimension of the region of emission being about 1 degree.

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