Electric field representation of pulsar intensity spectra

M. A. Walker, D. R. Stinebring

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Abstract

Pulsar dynamic spectra exhibit high-visibility fringes arising from interference between scattered radiowaves. These fringes may be random or of highly ordered patterns, depending on the nature of the scattering or refraction. Here we consider the possibility of decomposing pulsar dynamic spectra-which are intensity measurements-into their constituent scattered waves, i.e. electric field components. We describe an iterative method of achieving this decomposition and show how the algorithm performs on data from the pulsar B0834+06. The match between model and observations is good, although not formally acceptable as a representation of the data. Scattered wave components derived in this way are immediately useful for qualitative insights into the scattering geometry. With some further development, this approach can be put to a variety of uses, including: imaging the scattering and refracting structures in the interstellar medium; interstellar interferometric imaging of pulsars at a very high angular resolution and mitigating pulse arrival time fluctuations due to interstellar scattering.

Original languageEnglish
Pages (from-to)1279-1285
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume362
Issue number4
DOIs
Publication statusPublished - 1-Oct-2005

Keywords

  • scattering : turbulence
  • techniques : interferometric
  • pulsars : general
  • ISM : general
  • EXTREME SCATTERING EVENTS
  • INTERSTELLAR-MEDIUM
  • COMPACT STRUCTURES
  • PHASE RETRIEVAL
  • SCINTILLATION
  • SIZE

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