Large zenith angle observations of flares from Mkn421 in 2004 with H.E.S.S.

Details Large zenith angle observations of flares from Mkn421 in 2004 with H.E.S.S. Large zenith angle observations of flares from Mkn421 in 2004 with H.E.S.S.

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.3806h&link_type=abstract

American Astronomical Society, HEAD meeting #8, #38.06; Bulletin of the American Astronomical Society, Vol. 36, p.1204

Astronomy and Astrophysics

Astronomy

Scientific paper

Mkn421 was observed during a high flux state for 9 nights in April and May 2004 with the fully operational High Energy Stereoscopic System (H.E.S.S.) in Namibia. The observations were carried out at zenith angle distances of 61-64° which give an increased threshold of 1.5 TeV. Observations of the Crab nebula at similar zenith angles are used to check on the reliability of the large zenith angle observation technique. Roughly 7000 photons from Mkn421 were accumulated. The overall significance of the detection exceeds 80 standard deviations. The light-curve shows night-by-night variations by a factor of 2. The energy spectrum is curved and may be fit with a power-law with an exponential cut-off.

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