Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...375.1008a&link_type=abstract
Astronomy and Astrophysics, v.375, p.1008-1017 (2001)
Astronomy and Astrophysics
Astrophysics
32
Gamma-Rays: Observations, Ism: Cosmic Rays
Scientific paper
Using the HEGRA system of imaging atmospheric Cherenkov telescopes, a region of the Galactic plane (-10o < b < 5o, 38o < l < 43o) 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 6.1*E-15 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.
Aharonian Felix A.
Akhperjanian A. G.
Barrio J. A.
Bernlöhr Konrad
Bojahr H.
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