Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-29
Astron.Astrophys. 391 (2002) L25-28
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:20021034
The BL Lac Object 1ES 1426+428, at a red-shift of z=0.129, has been monitored by the CAT telescope from February 1998 to June 2000. The accumulation of 26 hours of observations shows a gamma-ray signal of 321 events above 250 GeV at 5.2 standard deviations, determined using data analysis cuts adapted to a weak, steep-spectrum source. The source emission has an average flux of Phi_diff(400 GeV) = 6.73 +/- 1.27stat +/- 1.45syst x 10^-11 /cm^-2/s/TeV, and a very steep spectrum, with a differential spectral index of gamma = -3.60 +/- 0.57 which can be refined to gamma = -3.66 +/- 0.41 using a higher flux data subset. If, as expected from its broad-band properties, the Very High Energy emission is hard at the source, these observations support a strong absorption effect of gamma-rays by the Intergalactic Infrared field.
Bazer-Bachi R.
Debiais G.
Degrange Bernard
Djannati-Ataï Arache
Espigat P.
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