Constraining the production of cosmic rays by pulsars

Abstract

One of the possible sources of hadronic cosmic rays (CRs) are newborn pulsars. If this is indeed the case, they should feature diffusive gamma-ray halos produced by interactions of CRs with interstellar gas. In this paper we try to identify extended gamma-ray emission around young pulsars, making use of the 7-year Fermi-LAT data. For this purpose we select and analyze a set of eight pulsars that are most likely to possess detectable gamma-ray halos. We find extended emission that might be interpreted as a gamma-ray halo only in the case of PSR J0007+7303. Its luminosity accords with the total energy of injected cosmic rays $\sim 10^{50}$ erg, although other interpretations of this source are possible. Irrespectively of the nature of this source we put bounds on the luminosity of gamma-ray halos which suggest that pulsars' contribution to the overall energy budget of galactic CRs is subdominant in the GeV-TeV range.

20 pages, 11 figures; TS(Flux) scaling refined, constraints revisited, overall improvement in presentation; version to appear in PRD

References in corpus (14)

• Observations of the Crab Nebula with H.E.S.S
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Origin of Galactic Cosmic Rays
• Global cosmic-ray related luminosity and energy budget of the Milky Way
• On the birthrates of Galactic neutron stars
• The origin of galactic cosmic rays
• Signatures of a two million year old supernova in the spectra of cosmic ray protons, antiprotons and positrons
• The Supernova Remnant W44: confirmations and challenges for cosmic-ray acceleration
• On ultra-high energy cosmic ray acceleration at the termination shock of young pulsar winds
• Evidence of Fermi bubbles around M31
• The theory of pulsar wind nebulae
• Filamentary Diffusion of Cosmic Rays on Small Scales
• Molecular environment, reverberation, and radiation from the pulsar wind nebula in CTA 1
• Fermi LAT Observation of Supernova Remnant HB9

Cited by in corpus (2)

• Study of eccentric binaries in Horndeski theory
• Horndeski gravity without screening in binary pulsars