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The detection of TeV γ-rays from the blazar H1426+428 at an integral flux level of (4± 2stat ± 1syst)× 10−12erg cm−2s−1 above 1TeV with the HEGRA imaging atmospheric Cherenkov telescope system is reported. H 1426+428 is located at a redshift of z=0.129, which makes it the most distant source detected in TeV γ-rays so far. The TeV radiation is expected to be(More)
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic system of Cherenkov Telescopes between 1996 and 2002 in the TeV energy regime. The observations were motivated by the positive results obtained for Mkn 421 and Mkn 501. The distances of the selected objects vary over a large range of redshifts between z =(More)
TeV γ-rays from the BL Lac object 1ES 1959+650 have been measured during the years 2000 and 2001 with a significance of 5.2σ at a value of 5.3% of the Crab flux and in May 2002 during strong outbursts with >23σ at a flux level of up to 2.2 Crab, making 1ES 1959+650 the TeV Blazar with the third best event statistics. The deep observation of 197.4 h has been(More)
For the first time an excess of photons above an energy threshold of 730 GeV from the giant radio galaxy M 87 has been measured at a significance level above 4 σ. The data have been taken during the years 1998 and 1999 with the HEGRA stereoscopic system of 5 imaging atmospheric Cherenkov telescopes. The excess of 107.4±26.8 events above 730 GeV corresponds(More)
A search for TeV gamma-ray emission from SNRs, pulsars and unidentified GeV sources in the Galactic plane in the longitude range between −2 • and 85 • Abstract. Using the HEGRA system of imaging atmospheric Cherenkov telescopes, one quarter of the Galactic plane (−2 • < l < 85 •) was surveyed for TeV gamma-ray emission from point sources and moderately(More)
The HEGRA system of imaging air Cherenkov telescopes has been used to observe the BL Lac object H1426+428 (z = 0.129) for 217.5 hours in 2002. In this data set alone, the source is detected at a confidence level of 5.3 σ, confirming this object as a TeV source. The overall flux level during the observations in 2002 is found to be a factor of ≈ 2.5 lower(More)
In this paper we present the results of simultaneous observations of the TeV blazar Markarian 421 (Mrk 421) at X-ray and TeV gamma-ray energies with the Rossi XRay Timing Explorer (RXTE) and the stereoscopic Cherenkov Telescope system of the HEGRA (High Energy Gamma Ray Astronomy) experiment, respectively. The source was monitored from February 2nd to(More)