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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 543073.0, MPI für Physik / MPI für Physik
TeV gamma-ray light curve and energy spectrum of Mkn421 during its 2001 flare as measured with HEGRA CT1
Authors:Aharonian, F.; Akhperjanian, A.; Beilicke, M.; Bernlöhr, K.; Börst, H. G.; Bojahr, H.; Bolz, O.; Coarasa, J. A.; Contreras, J. L.; Cortina, J.; Denninghof, S.; Fonseca, V.; Girma, M.; Goebel, F.; Götting, N.; Heinzelmann, G.; Hermann, G.; Heusler, A.; Hofmann, W.; Horns, D.; Jung, I.; Kankanyan, R.; Kestel, M.; Kettler, J.; Kohnle, A.; Konopelko, A.; Kranich, D.; Krawczynski, H.; Lampeitl, H.; López, M.; Lorenz, E.; Lucarelli, F.; Mang, O.; Meyer, H.; Mirzoyan, R.; Moralejo, A.; Oña-Wilhelmi, E.; Paneque, D.; Panter, M.; Plyasheshnikov, A.; Pühlhofer, G.; de los Reyes, R.; Rhode, W.; Ripken, J.; Rowell, G.; Sahakian, V.; Samorski, M.; Schilling, M.; Schweizer, T.; Sevilla, I.; Siems, M.; Sobczynska, D.; Stamm, W.; Tluczykont, M.; Tonello, N.; Vitale, V.; Völk, H. J.; Wagner, R. M.; Wiedner, C. A.; Wittek, W.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astronomy &Amp; Astrophysics
Journal Abbrev.:Astron.Astrophys.
Issue / Number:410
Start Page:813
End Page:821
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:In the first month of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy spectrum of Mkn 421 as measured with the HEGRA stand alone telescope CT1. Around 30 % of the data were taken under moonlight conditions. The spectrum shows a significance exponential energy cutoff at around 3.4 TeV. The results from the dark night- and the moon data are in excellent agreement with each other. A significance spectral shape variation depending on the flux level has been found. The TeV light curve is also found to be highly correlated with the X-ray light curve of the RXTE/ ASM satellite, showing no significant time lag larger than 0.2 d. The derived correlation coefficient of 0.83 corresponds to a 5.2 sigma significance.
Classification / Thesaurus:HEGRA
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N.N.
Affiliations:MPI für Physik
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