Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-07-02
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Contribution to the 31st ICRC, Lodz, Poland, July 2009
Scientific paper
M87 is the first known radio galaxy to emit very high energy (VHE) gamma-rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable on a timescale as short as 1 day, reaching 15% of the Crab Nebula flux above 350 GeV. In contrast, the flux at lower energies (150 GeV to 350 GeV) is compatible with being constant. We present light curves and energy spectra, and argue that the observed day-scale flux variability favours the M87 core as source of the gamma-ray emission rather than the bright know HST-1 in the jet of M87.
Berger Karsten
for the MAGIC Collaboration
Galante Nicola
Mazin Daniel Dr.
Tescaro Diego
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