Mon. Not. R. Astron. Soc., 318, 58-66 (2000/October-2)
Limits on radio emission from pulsar wind nebulae.
GAENSLER B.M., STAPPERS B.W., FRAIL D.A., MOFFETT D.A., JOHNSTON S. and CHATTERJEE S.
Abstract (from CDS):
We report on a sensitive survey for radio pulsar wind nebulae (PWN) towards 27 energetic and/or high-velocity pulsars. Observations were carried out at 1.4GHz using the Very Large Array and the Australia Telescope Compact Array and utilized pulsar-gating to search for off-pulse emission. These observing parameters resulted in a considerably more sensitive search than previous surveys and could detect PWN over a much wider range of spatial scales (and hence ambient densities and pulsar velocities). However, no emission clearly corresponding to a PWN was discovered. Based on these non-detections we argue that the young and energetic pulsars in our sample have winds which are typical of young pulsars, but produce unobservable PWN because they reside in low-density (n∼0.003cm–3) regions of the interstellar medium. However, non-detection of PWN around older and less energetic pulsars can only be explained if the radio luminosity of their winds is less than 10–5 of their spin-down luminosity, implying an efficiency at least an order of magnitude smaller than that seen for young pulsars.
2000, Royal Astronomical Society
pulsars: general - ISM: general - supernova remnants - radio continuum: ISM