A change in angular size of the compact source in the Crab Nebula

Details A change in angular size of the compact source in the Crab Nebula A change in angular size of the compact source in the Crab Nebula

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176p..53b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, Aug. 1976, p. 53P-55P.

Astronomy and Astrophysics

Astronomy

Crab Nebula, Interplanetary Dust, Pulsars, Radio Scattering, Radio Sources (Astronomy), Scintillation, Radiant Flux Density, Size Determination, Stellar Luminosity

Scientific paper

Observations of interplanetary scintillation at 81.5 MHz are described which indicate that the angular size of the pulsar in the Crab Nebula has increased by a factor of at least three over the period from 1969 to 1975. It is shown that this phenomenon cannot reasonably be explained by changes in the interstellar or interplanetary medium or by intrinsic intensity variations in the pulsar. The result suggests an enhancement of scattering in a region near the pulsar.

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