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Evidence for TeV gamma ray emission from Cassiopeia A
- Source :
- Scopus-Elsevier, ResearcherID
-
Abstract
- 232 hours of data were accumulated from 1997 to 1999, using the HEGRA Stereoscopic Cherenkov Telescope System to observe the supernova remnant Cassiopeia A. TeV gamma ray emission was detected at the 5 sigma level, and a flux of (5.8 +- 1.2(stat) +- 1.2(syst)) 10^(-9) ph m^(-2) s^(-1) above 1 TeV was derived. The spectral distribution is consistent with a power law with a differential spectral index of -2.5 +- 0.4(stat) +- 0.1(syst) between 1 and 10 TeV. As this is the first report of the detection of a TeV gamma ray source on the "centi-Crab" scale, we present the analysis in some detail. Implications for the acceleration of cosmic rays depend on the details of the source modeling. We discuss some important aspects in this paper.<br />9 pages, 6 figures, accepted for publication in Astronomy & Astrophysics
- Subjects :
- Physics
Spectral index
Astrophysics::High Energy Astrophysical Phenomena
Astrophysics (astro-ph)
Gamma ray
FOS: Physical sciences
HEGRA
Astronomy and Astrophysics
Cosmic ray
Astrophysics
law.invention
Cassiopeia A
Telescope
Space and Planetary Science
law
High Energy Physics::Experiment
Supernova remnant
Cherenkov radiation
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Scopus-Elsevier, ResearcherID
- Accession number :
- edsair.doi.dedup.....21818880468214cee310c36ad386e8b3