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The multiwavelength observation of the nearby radio galaxy M87 provides aunique opportunity to study in detail processes occurring in Active GalacticNuclei from radio waves to TeV gamma-rays. Here we report the detection ofgamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITASatmospheric Cherenkov telescope array and discuss its correlation with theX-ray emission. The gamma-ray emission is measured to be point-like with anintrinsic source radius less than 4.5 arcmin. The differential energy spectrumis fitted well by a power-law function:dPhi/dE=(7.4+-1.3_{stat}+-1.5_{sys})(E/TeV)^{-2.31+-0.17_{stat}+-0.2_{sys}}10^{-9}m^{-2}s^{-1}TeV^{-1}. We show strong evidence for a year-scalecorrelation between the gamma-ray flux reported by TeV experiments and theX-ray emission measured by the ASM/RXTE observatory, and discuss the possibleshort-time-scale variability. These results imply that the gamma-ray emissionfrom M87 is more likely associated with the core of the galaxy than with otherbright X-ray features in the jet.

Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS