A Search for Pulsations from Geminga above 100 GeV with VERITAS

E Aliu,S Archambault, A J Archer,T Aune,A Barnacka,M Beilicke,W Benbow,R Bird,J H Buckley,V Bugaev,K L Byrum,J Cardenzana,M Cerruti,Xu Chen,L Ciupik, M P Connolly,Wei Cui,H J Dickinson,J P Dumm,J Eisch,M Errando,A Falcone,Q Feng,J P Finley,H Fleischhack,P Fortin,L Fortson,A Furniss,G H Gillanders,Steven T Griffin,Scott Griffiths, J Grube,G Gyuk, D Hanna,J Holder,T B Humensky,C A Johnson,Philip Kaaret, P Kar,M Kertzman,D B Kieda, F Krennrich,Sanat K Kumar,M J Lang,Maxim Lyutikov,A S Madhavan, G Maier,S Mcarthur,Amanda Mccann,K Meagher,J Millis,P Moriarty,R Mukherjee,D Nieto,R A Ong,A N Otte,N Park,M Pohl, A Popkow,H Prokoph,E Pueschel,John J Quinn,K Ragan,L C Reyes,P T Reynolds,Gordon T Richards,E Roache,M T Santander,G H Sembroski, K Shahinyan,A W Smith,D Staszak,I Telezhinsky, J V Tucci,J Tyler,A Varlotta,S Vincent,S P Wakely,A J R Weinstein,David A Williams, A Zajczyk,B Zitzer

ASTROPHYSICAL JOURNAL（2015）

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摘要

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.

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关键词

gamma rays: stars,pulsars: general,pulsars: individual (PSR J0633+1746, Geminga)

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