Observation of the giant radio galaxy M87 with the HEGRA Cherenkov telescopes

Details Observation of the giant radio galaxy M87 with the HEGRA Cherenkov telescopes Observation of the giant radio galaxy M87 with the HEGRA Cherenkov telescopes

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newar..48..407b&link_type=abstract

New Astronomy Reviews, Volume 48, Issue 5-6, p. 407-410.

Astronomy and Astrophysics

Astronomy

6

Γ-Rays: Observations, Tev Emission, Galaxies: Individual: M87

Scientific paper

The giant radio galaxy M87, well studied from radio to X-ray energies, is located in the Virgo cluster of galaxies at a distance of ~16 Mpc (redshift z=0.00436). M87 has been observed with the HEGRA stereoscopic system of five Cherenkov telescopes in the years 1998 and 1999 for more than 80 h. An excess of TeV γ-rays on the 4σ level has been found in the data corresponding to an integral flux (E>730 GeV) of 3.3% of the Crab nebula flux. The HEGRA detection - if confirmed - would make M87 the first TeV γ-ray emitting AGN observed with the imaging atmospheric Cherenkov technique not belonging to the BL Lac class.

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