Contact: Henric Krawczynski
krawcz@wuphys.wustl.edu
314-803-8732
Washington University in St. Louis

Very-high-energy Gamma-ray Emission

Caption: The chart below describes results of the study "Radio Imaging of the Very-High-Energy Gamma-Ray Emission Region in the Central Engine of a Radio Galaxy," which appears in the July 2 Science Express. The upper panel shows the very-high-energy gamma-ray emission from the radio galaxy M87 during 2007-2008 measured with the VERITAS, H.E.S.S and MAGIC experiments. The regular gaps in the light curve correspond to phases of full moon during which no observations were possible. The vertical gray box indicates the time period of the strong flaring activity. The lower panel shows the radio flux as measured with the Very Long Baseline Array, which detects radio waves with high spatial precision, from a region very close to the supermassive black hole in M87.

Credit: The VERITAS Collaboration, the VLBA 43 GHz M 87 Monitoring Team, the H.E.S.S. Collaboration, and the MAGIC Collaboration.

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