Search for diffuse gamma rays from the Galactic anticentre region above 100 GeV with CELESTE
Authors
Bussons Gordo, JavierIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/59289DOI: 10.1051/0004-6361/200811476
Publisher
Springer-Verlag
Date
2009-04-01Bibliographic citation
Bussons, Javier. Search for diffuse gamma rays from the Galactic anticentre region above 100 GeV with CELESTE. Astronomy and Astrophysics. 2009,vol. 498, p.25-28
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.1051/0004-6361/200811476Rights
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
© ESO 2009
Access rights
info:eu-repo/semantics/openAccess
Abstract
Context. Located in the French Pyrénées, CELESTE was the first ground-based ?-ray telescope with an energy threshold below 100 GeV. It acquired data from 1999 to 2004, and allowed flux measurements of the Crab nebula and the blazars Mrk 421 and Mrk 501. Aims. We search for Galactic diffuse ?-ray emission, which is most significant around the Galactic plane, for b = [?5 ? , +5 ? ]. Methods. By using the significant data set available for the Crab nebula, we selected Crab OFF-source data at various Galactic latitudes, in order to analyse the diffuse emission. Selection criteria were applied to the sky position, atmospheric conditions, and detector stability. Results. We obtained 108 mn of data in the Galactic anticentre region, providing the first upper limits of around 100 GeV to the ?3 diffuse ?-ray emission with atmospheric Cherenkov detectors. These limits are ? UL m ?2 s ?1 sr ?1 and int (E > 140 GeV) = 9.4 × 10 UL ?2 ?2 ?1 ?1 ? int (E > 120 GeV) = 1.2 × 10 m s sr .
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