Focusing of alfvénic wave power in the context of gamma-ray burst emissivity

Marco Fatuzzo, Fulvio Melia

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Highly dynamic magnetospheric perturbations in neutron star environments can naturally account for the features observed in gamma-ray burst spectra. The source distribution, however, appears to be extragalactic. Although noncatastrophic isotropic emission mechanisms may be ruled out on energetic and timing arguments, MHD processes can produce strongly anisotropic γ-rays with an observable flux out to distances of ∼1-2 Gpc. Here we show that sheared Alfvén waves propagating along open magnetospheric field lines at the poles of magnetized neutron stars transfer their energy dissipationally to the current sustaining the field misalignment and thereby focus their power into a spatial region ∼1000 times smaller than that of the crustal disturbance. This produces a strong (observable) flux enhancement along certain directions. We apply this model to a source population of "turned-off" pulsars that have nonetheless retained their strong magnetic fields and have achieved alignment at a period of ≳5 seconds.

Original languageEnglish (US)
Pages (from-to)L89-L92
JournalAstrophysical Journal
Volume414
Issue number2 PART 2
DOIs
StatePublished - Sep 10 1993

Keywords

  • Acceleration of particles
  • Cosmology: miscellaneous
  • Galaxies: evolution
  • Gamma rays: bursts
  • MHD
  • Pulsars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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