Veritas Studies Of Hard-Spectrum Blazars Detected By Fermi-LAT

Astronomy and Astrophysics – Astronomy

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Scientific paper

The all-sky survey capability of Fermi-LAT has yielded a number of hard-spectrum gamma-ray sources which are good prospects for detection at very high energy (VHE), above 100 GeV. We report the results of observations with VERITAS of more than twenty such sources, for many of which we have associated multiwavelength data. Two of the objects detected for the first time at very high energy by VERITAS, VER J0521+211 and VER J0648+152, are near the galactic plane and were originally unidentified. They can now be identified as blazars based on the observations reported here. We will discuss the implications of spectral modeling of these sources. VERITAS upper limits on VHE emission from some of the sources not detected imply a softening of the spectrum between the 100 MeV-100 GeV band measured by Fermi-LAT and the >100 GeV band observed with VERITAS.

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