TeV gamma -ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1

Details TeV gamma -ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1 TeV gamma -ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..813a&link_type=abstract

Astronomy and Astrophysics, v.410, p.813-821 (2003)

Astronomy and Astrophysics

Astrophysics

21

Gamma Rays: Observations, Bl Lacertae Objects: Individual: Mkn 421

Scientific paper

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 sigma significance.
Table 4 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/410/813

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