Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-08
Astron.Astrophys. 441 (2005) 465-472
Astronomy and Astrophysics
Astrophysics
9 pages, 1 figure (accepted for publication in Astronomy & Astrophysics on June 16, 2005)
Scientific paper
10.1051/0004-6361:20053478
A sample of selected active galactic nuclei (AGN) was observed in 2003 and 2004 with the High Energy Stereoscopic System (H.E.S.S.), an array of imaging atmospheric-Cherenkov telescopes in Namibia. The redshifts of these candidate very-high-energy (VHE, >100 GeV) gamma-ray emitters range from z=0.00183 to z=0.333. Significant detections were already reported for some of these objects, such as PKS 2155-304 and Markarian 421. Marginal evidence (3.1 sigma) for a signal is found from large-zenith-angle observations of Markarian 501, corresponding to an integral flux of I(>1.65 TeV) = (1.5 +/- 0.6 (stat) +/- 0.3 (syst)) x 10^{-12} cm^{-2} s^{-1} or ~15% of the Crab Nebula flux. Integral flux upper limits for 19 other AGN, based on exposures of ~1 to ~8 hrs live time, and with average energy thresholds between 160 GeV and 610 GeV, range from 0.4% to 5.1% of the Crab Nebula flux. All the upper limits are the most constraining ever reported for these objects.
No associations
LandOfFree
Observations of Selected AGN with H.E.S.S does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observations of Selected AGN with H.E.S.S, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of Selected AGN with H.E.S.S will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-374548