A joint H.E.S.S./MAGIC/VERITAS observation campaign on the radio galaxy M 87 to probe the origin of VHE γ-raye mission

Details A joint H.E.S.S./MAGIC/VERITAS observation campaign on the radio galaxy M 87 to probe the origin of VHE γ-raye mission A joint H.E.S.S./MAGIC/VERITAS observation campaign on the radio galaxy M 87 to probe the origin of VHE γ-raye mission

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..553b&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

2

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

Scientific paper

The giant elliptical radio galaxy M 87 is the closest known extragalactic object emitting very-high-energy (VHE) γ-rays. The prominent jet of M 87 was extensively studied throughout the electromagnetic spectrum in the past revealing a complex structure resolved at radio, optical and X-ray energies. Knots in the jet indicate active regions, possibly associated with particle acceleration to ultra-relativistic energies. However, the origin of the measured VHE γ-rays is still unknown. No clear correlation of the VHE γ-rays with other wavelengths was found so far, whereas the size of the VHE emitting region is strongly constrained by the detection of variability on time-scales of days in 2005 and 2008. In a joint effort, H.E.S.S., MAGIC and VERITAS performed an intensive, coordinated monitoring campaign on M 87 in 2008 with a total coverage of >120 h of observation time. The motivation, coordination, results and implications for future campaigns are discussed.

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