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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



ID: 43736.0, MPI für Kernphysik / High-Energy Astrophysics
Observations of the Crab Nebula with the HEGRA system of IACTs in convergent mode using a topological trigger
Authors:Lucarelli, F.; Konopelko, A.; Aharonian, F.; Hofmann, W.; Kohnle, A.; Lampeitl, H.; Fonseca, V.
Language:English
Date of Publication (YYYY-MM-DD):2003-06
Title of Journal:Astroparticle Physics
Volume:19
Issue / Number:3
Start Page:339
End Page:350
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Routine observations of the Crab Nebula for a total of about 250 h, performed with the HEGRA stereoscopic system of five imaging atmospheric Cerenkov telescopes in the standard operational mode, have proven the energy threshold of the system to be 500 GeV for small zenith angles (theta less than or equal to 20degrees). A topological trigger applied along with the convergent observational mode allows to reduce noticeably the energy threshold of the system down to 350 GeV. Here we present the relevant Monte Carlo simulations as well as the analysis results of 15 It Crab Nebula data taken in such an observational mode. From the Crab Nebula data, the final energy threshold was found to be 350 GeV. The estimated gamma-ray flux from the Crab Nebula above 350 GeV is (8.1 +/- 0.1(stat) +/- 0.2(syst)) x 10(-11) ph cm(-2)s(-1), which is consistent with recent measurements reported by the STACEE, CELESTE, CAT, and Whipple groups
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Univ Complutense, Fac Ciencias Fis, Dpto Fis Atom
Avda Complutense S-N
E-28040 Madrid
Spain

Univ Complutense, Fac Ciencias Fis, Dpto Fis Atom
E-28040 Madrid
Spain
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