A stacked analysis of 115 pulsars observed by the Fermi LAT
作者： A. McCann
DOI: 10.1088/0004-637X/804/2/86
关键词:
摘要: Due to the low gamma-ray fluxes from pulsars above 50 GeV and small collecting area of space-based telescopes, emission discovered by Fermi-LAT in $\sim$150 is largely unexplored at these energies. In this regime, uncertainties on spectral data points and/or constraints upper-limits are not sufficient provide robust tests competing models individual pulsars. The discovery power-law-type Crab pulsar energies exceeding 100 provides a compelling justification for exploration other We applied method Aperture Photometry measure spectra present stacked analysis 115 selected Second Catalog Gamma-ray Pulsars. This analysis, which uses an average $\sim$4.2 years per pulsar, aggregates low-level cannot be resolved objects but can detected ensemble. find no significant excess GeV. An upper limit $\sim$30% level found flux 100-177 energy range 95% confidence level. Stacked searches exclusive young sample, millisecond several promising sub-samples also return excesses
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