Abstract
VERITAS is an imaging atmospheric Cherenkov telescope array carrying out observations of the gamma-ray sky at energies above 100 GeV. Located in southern Arizona, VERITAS consists of an array of four telescopes, and carries out a comprehensive observing program for Galactic and extragalactic high energy sources. Observations of astrophysical objects in the TeV band are sensitive probes of highly energetic processes occurring in these sources. The majority of the extragalactic sources detected at TeV energies are active galaxies of the blazar class, sources where we view the jet nearly along its axis. In this report we present recent results from the VERITAS extragalactic program, focusing on blazars.
Highlights
VERITAS progress in our understanding of the accelerators of very high energy particles in the universe.VERITAS started four-telescope operations in 2007, and typically collects more than ∼ 1100 hours of data per year
In the summer of 2012 the VERITAS cameras were replaced with new high-quantum efficiency photomultiplier tubes [3] that increased the photon detection efficiency of each camera by approximately 50%
This article presents a brief summary of the VERITAS results on blazars from the past four years of observations
Summary
Progress in our understanding of the accelerators of very high energy particles in the universe. A 30% improvement in sensitivity was achieved in 2009 when one of the telescopes was relocated to provide a more symmetric array layout, and a new alignment system was used which improved the instrument point spread function [2]. In this new telescope arrangement, VERITAS is able to detect a source with a Crab Nebula-like spectrum and a flux of 1% Crab Nebula strength in about 25 hours. In the summer of 2012 the VERITAS cameras were replaced with new high-quantum efficiency (hQE, QE > 32%) photomultiplier tubes [3] that increased the photon detection efficiency of each camera by approximately 50%. We review some of the results from VERITAS focusing on blazars and extragalactic sources
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