Issue |
A&A
Volume 375, Number 3, September 2001
|
|
---|---|---|
Page(s) | 1008 - 1017 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20010898 | |
Published online | 15 September 2001 |
A search for gamma-ray emission from the Galactic plane in the longitude range between and
1
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, lampeitl@daniel.mpi-hd.mpg.de
Received:
4
January
2001
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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