TeV neutrinos and gamma rays from pulsars

TL;DR

This paper estimates TeV gamma ray and neutrino fluxes from pulsars, highlighting the importance of polar cap geometry, and concludes that pulsars are unlikely to be detected by upcoming neutrino telescopes.

Contribution

It provides revised flux estimates for TeV gamma rays and neutrinos from pulsars, emphasizing the role of polar cap geometry in flux calculations.

Findings

Pulsars are unlikely to be detected by upcoming neutrino telescopes.

Proper consideration of polar cap geometry significantly affects flux estimates.

Estimated gamma ray and neutrino fluxes from pulsar nebulae are provided.

Abstract

Recent studies suggest that pulsars could be strong sources of TeV muon neutrinos provided positive ions are accelerated by pulsar polar caps to PeV energies. In such a situation muon neutrinos are produced through the delta resonance in interactions of pulsar accelerated ions with its thermal radiation field. High energy gamma rays also should be produced simultaneously in pulsar environment as both charged and neutral pions are generated in the interactions of energetic hadrons with the ambient photon fields. Here we estimate TeV gamma ray flux at Earth from few nearby young pulsars. When compared with the observations we find that proper consideration of the effect of polar cap geometry in flux calculation is important. Incorporating such an effect we obtain the (revised) event rates at Earth due to few potential nearby pulsars. The results suggest that pulsars are unlikely to be detected by the upcoming neutrino telescopes. We also estimate TeV gamma ray and neutrino fluxes from pulsar nebulae for the adopted model of particle acceleration.