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 × 10-13 s-1 cm-2 and 1.7 × 10-13 s-1 cm-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.
CITATION STYLE
Aliu, E., Archambault, S., Archer, A., Aune, T., Barnacka, A., Beilicke, M., … Zitzer, B. (2015). A search for pulsations from geminga above 100 GeV with veritas. Astrophysical Journal, 800(1). https://doi.org/10.1088/0004-637X/800/1/61
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