Volume 375, Number 3, September 2001
|Page(s)||1008 - 1017|
|Published online||15 September 2001|
A search for gamma-ray emission from the Galactic plane in the longitude range between and
Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
2 Yerevan Physics Institute, Alikhanian Br. 2, 375036 Yerevan, Armenia
3 Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany
4 Universidad Complutense, Facultad de Ciencias Físicas, Ciudad Universitaria, 28040 Madrid, Spain
5 Universität Kiel, Institut für Experimentelle und Angewandte Physik, Leibnizstraße 15-19, 24118 Kiel, Germany
6 Universität Wuppertal, Fachbereich Physik, Gaußstr. 20, 42097 Wuppertal, Germany
7 Universität Hamburg, II. Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
Corresponding author: H. Lampeitl, firstname.lastname@example.org
Accepted: 18 June 2001
Using the HEGRA system of imaging atmospheric Cherenkov telescopes, a region of the Galactic plane (, ) was surveyed for TeV gamma-ray emission, both from point sources and of diffuse nature. The region covered includes 15 known pulsars, 6 known supernova remnants (SNR) and one unidentified EGRET source. No evidence for emission from point sources was detected; upper limits are typically below 0.1 Crab units for the flux above 1 TeV. For the diffuse gamma-ray flux from the Galactic plane, an upper limit of ph cm-2 s-1 sr-1 MeV-1 was derived under the assumption that the spatial distribution measured by the EGRET instrument extends to the TeV regime. This upper flux limit is a factor of about 1.5 larger than the flux expected from the ensemble of gamma-ray unresolved Galactic cosmic ray sources.
Key words: gamma-rays: observations / ISM: cosmic rays
© ESO, 2001
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