A search for pulsations from Geminga above 100 GeV with VERITAS
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Aliu, E,Archambault, S,Archer, A,Aune, T,Barnacka, A,Beilicke, M,Benbow, W,Bird, R,Buckley, JH,Bugaev, V,Byrum, K,Cardenzana, JV,Cerruti, M,Chen, X,Ciupik, L,Connolly, MP,Cui, W,Dickinson, HJ,Dumm, J,Eisch, JD,Errando, M,Falcone, A,Feng, Q,Finley, JP,Fleischhack, H,Fortin, P,Fortson, L,Furniss, A,Gillanders, GH,Griffin, S,Griffiths, ST,Grube, J,Gyuk, G,Kansson, NH,Hanna, D,Holder, J,Humensky, TB,Johnson, CA,Kaaret, P,Kar, P,Kertzman, M,Kieda, D,Krennrich, F,Kumar, S,Lang, MJ,Lyutikov, M,Madhavan, AS,Maier, G,McArthur, S,McCann, A,Meagher, K,Millis, J,Moriarty, P,Mukherjee, R,Nieto, D,de Bhroithe, AO,Ong, RA,Otte, AN,Park, N,Pohl, M,Popkow, A,Prokoph, H,Pueschel, E,Quinn, J,Ragan, K,Reyes, LC,Reynolds, PT,Richards, GT,Roache, E,Santander, M,Sembroski, GH,Shahinyan, K,Smith, AW,Staszak, D,T (2015) 'A SEARCH FOR PULSATIONS FROM GEMINGA ABOVE 100 GeV WITH VERITAS'. Astrophysical Journal, 800 .
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 4.0x10(-13) s(-1) cm(-2) and 1.7 x 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 similar to 50 GeV.