Discovery of fast variability of the TeV γ-ray flux from the giant radio galaxy M87 with H.E.S.S.

Details Discovery of fast variability of the TeV γ-ray flux from the giant radio galaxy M87 with H.E.S.S. Discovery of fast variability of the TeV γ-ray flux from the giant radio galaxy M87 with H.E.S.S.

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..921..147b&link_type=abstract

THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 147-149 (2007).

Physics

Gamma-Ray Sources, Gamma-Ray Bursts, Radio Galaxies, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

The giant radio galaxy M 87 was observed at GeV/TeV γ-ray energies with the H.E.S.S. (High Energy Stereoscopic System) Cherenkov telescopes in the years 2003-2006. The observations confirm M 87 as the first extragalactic TeV γ-ray source not of the blazar type (first indications of a signal were reported by the HEGRA collaboration earlier). The TeV γ-ray flux as measured with H.E.S.S. is variable on time-scales of days which strongly constrains the size of the emission region, excluding several models. The H.E.S.S. results and theoretical interpretations are presented in this paper.

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