TeV observations of H1426+428 with HEGRA

Details TeV observations of H1426+428 with HEGRA TeV observations of H1426+428 with HEGRA

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newar..48..387h&link_type=abstract

New Astronomy Reviews, Volume 48, Issue 5-6, p. 387-390.

Astronomy and Astrophysics

Astronomy

Scientific paper

The blazar H1426+428 (z=0.129) has been observed with the HEGRA stereoscopic system of imaging air Cherenkov telescopes for 270 h in the years 1999, 2000, and 2002. The object is detected with a significance of 7.5σ. 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 at wavelengths between 1 and 10 μm causes substantial (τ=1,...,9) absorption of photons in the measured energy spectrum. The intrinsic spectra after correction for absorption are discussed. Contemporaneous 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.

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