Evidence for TeV gamma ray emission from Cassiopeia A

Citation
F. Aharonian et al., Evidence for TeV gamma ray emission from Cassiopeia A, ASTRON ASTR, 370(1), 2001, pp. 112-120
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
1
Year of publication
2001
Pages
112 - 120
Database
ISI
SICI code
0004-6361(200104)370:1<112:EFTGRE>2.0.ZU;2-E
Abstract
232 hours of data were accumulated from 1997 to 1999, using the HEGRA Stere oscopic Cherenkov Telescope System to observe the supernova remnant Cassiop eia A. TeV gamma -ray emission was detected at the 5 sigma level, and a flu x of (5.8 +/- 1.2(stat) +/- 1.2(syst)) 10(-9) ph m(-2) s(-1) above 1 TeV wa s 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 a nd 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 t he source modeling. Sire discuss some important aspects in this paper.