- Conference date: 7–11 July 2008
- Location: Heidelberg (Germany)
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 of observation time. The motivation, coordination, results and implications for future campaigns are discussed.
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