Juristische FakultätPhilosophische FakultätHumanwissenschaftliche FakultätWirtschafts- und Sozialwissenschaftliche FakultätMathematisch-Naturwissenschaftliche FakultätUniversität Potsdam
Universität Potsdam
Institut für Physik und Astronomie
Very-high Energy Observations of the Galactic Center Region by VERITAS in 2010-2012
Archer, A.; Barnacka, A.; Beilicke, M.; Benbow, W.; Berger, K.; Bird, R.; Biteau, J.; Buckley, J. H.; Bugaev, V.; Byrum, K.
The Galactic center is an interesting region for high-energy (0.1–100 GeV) and very-high-energy (E>100 GeV) γ-ray observations. Potential sources of GeV/TeV γ-ray emission have been suggested, e.g., the accretion of matter onto the supermassive black hole, cosmic rays from a nearby supernova remnant (e.g., Sgr A East), particle acceleration in a plerion, or the annihilation of dark matter particles. The Galactic center has been detected by EGRET and by Fermi/LAT in the MeV/GeV energy band. At TeV energies, the Galactic center was detected with moderate significance by the CANGAROO and Whipple 10 m telescopes and with high significance by H.E.S.S., MAGIC, and VERITAS. We present the results from three years of VERITAS observations conducted at large zenith angles resulting in a detection of the Galactic center on the level of 18 standard deviations at energies above ∼ 2.5 TeV. The energy spectrum is derived and is found to be compatible with hadronic, leptonic, and hybrid emission models discussed in the literature. Future, more detailed measurements of the high-energy cutoff and better constraints on the high-energy flux variability will help to refine and/or disentangle the individual models.
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