Search for gamma-ray emission from the Galactic plane in the longitude range between 37 degrees and 43 degrees

Citation
Fa. Aharonian et al., Search for gamma-ray emission from the Galactic plane in the longitude range between 37 degrees and 43 degrees, ASTRON ASTR, 375(3), 2001, pp. 1008-1017
Citations number
46
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY & ASTROPHYSICS
ISSN journal
1432-0746 → ACNP
Volume
375
Issue
3
Year of publication
2001
Pages
1008 - 1017
Database
ISI
SICI code
1432-0746(200109)375:3<1008:SFGEFT>2.0.ZU;2-V
Abstract
Using the HEGRA system of imaging atmospheric Cherenkov telescopes, a regio n of the Galactic plane (-10 degrees <b<5 degrees, 38 degrees <l<43 degrees ) was surveyed for TeV gamma-ray emission, both from point sources and of d iffuse nature. The region covered includes 15 known pulsars, 6 known supern ova remnants (SNR) and one unidentified EGRET source. No evidence for emiss ion from point sources was detected; upper limits are typically below 0.1 C rab units for the flux above 1 TeV. For the diffuse gamma-ray flux from the Galactic plane, an upper limit of 6.1 x 10(-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 g amma-ray unresolved Galactic cosmic ray sources.