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Astron. Astrophys. Suppl. Ser. 145, 243-254
Pulsars in the Westerbork Northern Sky Survey
M.L.A. Kouwenhoven
Send offprint request: M.L.A. Kouwenhoven
e-mail: M.L.A. Kouwenhoven@astro.uu.nl
Astronomical Institute, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
Received March 29; accepted May 10, 2000
Abstract:
I have searched the Westerbork Northern Sky Survey (WENSS) source list
for detections of known radio pulsars. A source with a flux
density greater than five times the local noise level is found near
the positions of 25 pulsars. The probability that one out of these 25
sources is a chance coincidence is about 10%. I have looked at the
WENSS maps of the non-detected pulsars. A flux density between
three and five times the local noise level is found near the positions
of 14 of these non-detected pulsars. There is a 50 percent probability
that (at least) one of these marginal detections is just a noise
fluctuation. Fourteen radio pulsars, which according to earlier flux
measurements have flux densities above three times the WENSS
noise level, are not detected. Of the 39 pulsars detected in the
WENSS 19 are also detected in the NRAO VLA Sky Survey (NVSS). By
combining the WENSS and NVSS flux densities for these 19 pulsars
spectral indices are obtained that differ by up to 50% from the long
term averaged values reported in the literature. This affects the
reliability of pulsar candidates that are selected on the basis of
their WENSS-NVSS spectral index.
Key words: pulsars: general -- surveys -- radio continuum: stars --
scattering
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