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Constraining the production of cosmic rays by pulsars

Mikhail M. Ivanov1,2,3, Maxim S. Pshirkov4,1,5, and Grigory I. Rubtsov1

  • 1Institute for Nuclear Research of the Russian Academy of Sciences, 117312 Moscow, Russia
  • 2Faculty of Physics, Moscow State University, 119991 Moscow, Russia
  • 3FSB/IPHYS/LPPC, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 4Sternberg Astronomical Institute, Lomonosov Moscow State University, 119992 Moscow, Russia
  • 5Pushchino Radio Astronomy Observatory, 142290 Pushchino, Russia

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Phys. Rev. D 94, 063004 – Published 13 September, 2016

DOI: https://doi.org/10.1103/PhysRevD.94.063004

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 ∼1050  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.

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Phys. Rev. D 94, 063004– Published 13 September, 2016
  • Received 7 June 2016

© 2016 American Physical Society

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