Discovery of VHE Gamma-Ray Emission from W Comae with VERITAS

Astronomy and Astrophysics – Astronomy

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Gamma-Ray, Quasars, Astronomical And Space-Research Instrumentation, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

VERITAS detected very-high-energy γ-ray emission from the intermediate-frequency-peaked BL Lac object W Comae (z = 0.102). A strong outburst of γ-rays was measured in the middle of March 2008, lasting for only four days. The energy spectrum measured during the two highest flare nights was found to be very steep (photon index Γ = 3.81+/-0.35). Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The results of the observations and modeling of the spectral energy distribution (SED) are presented.

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