Abstract
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.
| Original language | English |
|---|---|
| Article number | 61 |
| Journal | Astrophysical Journal |
| Volume | 800 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 10 Feb 2015 |
Keywords
- Gamma rays: Stars
- Pulsars: General
- Pulsars: Individual (psr j0633+1746, geminga)