Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2651h&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
The Blazar H1426+428 (z = 0.129) has been observed with the HEGRA stereoscopic system of imaging air Cherenkov telescopes for 270 hrs in the years 1999, 2000, and 2002. The object is detected with a significance of 7.5 σ . The energy spectrum measured by HEGRA extends up to ≈ 8 TeV with indications for a change in the spectral slope at energies above 2 TeV. The integral flux above 1 TeV in 1999 and 2000 amounts to ≈ 8 % of the flux of the Crab Nebula. In 2002, the flux drops to a level of 3 % of the Crab Nebula. The extragalactic background light (EBL) at wavelengths between 1 and 10 microns causes substantial (τ = 1 . . . 9) absorption of photons in the measured energy spectrum. The intrinsic spectra after correction for absorption are discussed. Nearly simultaneous observations with the X-ray observatory RXTE in 2000 and 2002 indicate flux and spectral variability in the X-ray band between 2 and 20 keV.
Aharonian Felix A.
Constamante L.
HEGRA Collaboration
Horns Dieter
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