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T: Teilchenphysik
T 301: Kosmische Strahlung V
T 301.5: Talk
Tuesday, March 11, 2003, 17:00–17:15, FO6
Analysis of the Large Gamma Ray Flares of Mkn421 in 2001 as observed with HEGRA CT1 in La Palma — •Thomas Schweizer1, Martin Kestel2, Daniel Kranich2, Juan Cortina1, Eckart Lorenz2, and for the HEGRA collaboration 2 — 1Insitut de Fisica d’Altes Energies, 08193 Bellaterra, Spanien — 2Max Planck Institut fur Physik, Fhringer Ring 6, 80805 Muenchen
Mkn 421, an active galactic nucleus, exhibited an increased activitiy of high energy gamma-emission from February 2001 to April 2001. The analysis results of these gamma flares of Mkn421 in 2001 as observed with the HEGRA CT1 telescope on the island of La Palma is presented. The classical analysis and gamma/hadron separation methods of Cherenkov telescopes have been improved by several new techniques, which have been tried and tested for the first time here. The improved analysis has been applied to the measurements of the large gamma flares in 2001 of Mkn 421. In brief, the final results are the following: Very fast variability down to only 15 minutes, a cutoff in the spectrum at 3.1 TeV, a hardening in the spectrum for increased gamma flux and a correlation of 0.74 +- 0.05 between Gamma-ray flux and X-ray flux as measured with the ASM on the RXTE satellite.