Observations of Selected AGN with H.E.S.S
| dc.creator | al., F. Aharonian et | |
| dc.date | 2005-07-08 | |
| dc.date.accessioned | 2026-07-07T06:29:32Z | |
| dc.date.available | 2026-07-07T06:29:32Z | |
| dc.description | 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. | |
| dc.description | 9 pages, 1 figure (accepted for publication in Astronomy & Astrophysics on June 16, 2005) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0507207 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0507207 | |
| dc.identifier | Astron.Astrophys. 441 (2005) 465-472 | |
| dc.identifier | doi:10.1051/0004-6361:20053478 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/98063 | |
| dc.subject | Astrophysics | |
| dc.title | Observations of Selected AGN with H.E.S.S | |
| dc.type | text |