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A Search for Pulsations from Geminga Above 100 GeV with VERITAS
Journal article   Open access   Peer reviewed

A Search for Pulsations from Geminga Above 100 GeV with VERITAS

E Aliu, S Archambault, A Archer, T Aune, A Barnacka, M Beilicke, W Benbow, R Bird, J. H Buckley, V Bugaev, …
The Astrophysical journal, Vol.800(1), pp.1-7
12/15/2014
DOI: 10.1088/0004-637X/800/1/61
url
https://doi.org/10.1088/0004-637X/800/1/61View
Published (Version of record) Open Access

Abstract

We present the results of 71.6 hours of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between November 2007 and February 2013 were phase-folded using a Geminga pulsar timing solution derived from data recorded by the XMM-\emph{Newton} and \emph{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$\times10^{-13}$ s$^{-1}$ cm$^{-2}$ and 1.7$\times10^{-13}$ 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 five years of data from the \emph{Fermi}-LAT, constrain possible hardening of the Geminga pulsar emission spectra above $\sim$50 GeV.
Physics - High Energy Astrophysical Phenomena

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