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Type: Journal article
Title: TeV γ-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1
Other Titles: TeV gamma-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1
Author: Aharonian, F.
Akhperjanian, A.
Beilicke, M.
Bernlohr, K.
Borst, H.
Bojahr, H.
Bolz, O.
Coarasa, T.
Contreras, J.
Contina, J.
Denninghoff, S.
Fonseca, V.
Girma, M.
Goebel, F.
Gotting, N.
Heinzelmann, G.
Hermann, G.
Heusler, A.
Hofmann, W.
Horns, D.
et al.
Citation: Astronomy and Astrophysics: a European journal, 2003; 410(3):813-821
Publisher: E D P Sciences
Issue Date: 2003
ISSN: 0004-6361
Statement of
F. Aharonian,...G. P. Rowell,...and W. Wittek [et al]
Abstract: In the first months 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 significant 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 significant 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 σ significance.
Rights: © The European Southern Observatory 2003
DOI: 10.1051/0004-6361:20031265
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