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Pulsar astronomy at meter and decameter wavelengths: Results from Arecibo

  • J. A. Phillips
  • A. Wolszczan
V. Scattering in the ISM and Pulsar Observations
Part of the Lecture Notes in Physics book series (LNP, volume 362)

Abstract

We review the state of groundbased research in pulsar astronomy at low frequencies with an emphasis on new results from Arecibo. We have obtained high signal-to-noise profiles for six pulsars at 25, 47 and 111.5 MHz, along with several higher frequencies. Three of the pulsars in our sample had been previously reported to exhibit sporadic and intense interpulse emissions at decameter wavelengths. Our 25 MHz data show no evidence of off-pulse activity exceeding 4% of the main pulse intensity for PSR 0834+06, 2% for PSR 0950+08, and 1% for PSR 1133+16. Multifrequency timing data collected over a broad frequency range (25 → 4800 MHz) were used to derive accurate pulsar dispersion measures. We find that pulse arrival times obeyed a cold plasma dispersion law to high accuracy over a 200:1 frequency range. This result is compared with reports of low-frequency “superdispersion.” The timing data have also been used to set limits on the size and location of the radio emitting region in six pulsars. By analyzing the effects of retardation, abberation and magnetic sweepback on pulse arrival times we find the radial extent of the emission region to be < 200 km over a 100:1 frequency range. The data indicate emission altitudes less than 3 stellar radii above the surface of the neutron star.

Keywords

Neutron Star Dispersion Measure Main Pulse Millisecond Pulsar Fiducial Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • J. A. Phillips
    • 1
  • A. Wolszczan
    • 1
  1. 1.National Astronomy and Ionosphere CenterCornell UniversityUSA

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