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Aliu, E; Archambault, S; Archer, A; Aune, T; Barnacka, A; Beilicke, M; Benbow, W; Bird, R; Buckley, J H; Bugaev, V
Astrophysical journal/The Astrophysical journal, 02/2015, Letnik: 800, Številka: 1Journal Article
We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between 2007 November and 2013 February were phase-folded using a Geminga pulsar timing solution derived from data recorded by the XMM-Newton and Fermi-LAT space telescopes. No significant pulsed emission above 100 GeV is observed, and we report upper limits at the 95% confidence level on the integral flux above 135 GeV (spectral analysis threshold) of 4.0 x 10 super(-13) s super(-1) cm super(-2) and 1.7 x 10 super(-13) s super(-1) cm super(-2) for the two principal peaks in the emission profile. These upper limits, placed in context with phase-resolved spectral energy distributions determined from 5 yr of data from the Fermi-Large Area Telescope (LAT), constrain possible hardening of the Geminga pulsar emission spectra above ~50 GeV.
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