EDP Sciences
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Volume 370, Number 2, May I 2001
Page(s) 586 - 590
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20010274

A&A 370, 586-590 (2001)
DOI: 10.1051/0004-6361:20010274

Scatter broadening of pulsars in the direction of the Gum nebula

D. Mitra1 and R. Ramachandran2

1  Raman Research Institute, Bangalore 560 080, India
    e-mail: dmitra@iucaa.ernet.in
2  Stichting ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands

(Received 24 November 2000 / Accepted 7 February 2001 )

We have measured the scatter broadening of pulsars in the direction of the Gum nebula. For the first time, our observations show clear variations of scattering properties across the Gum nebula. The IRAS-Vela shell is shown to be a high scattering region. Our revised estimations of distances to these pulsars are consistently less by a factor of 2-3, which has very important consequences for the deduced values of radio luminosity and transverse velocity of pulsars.

Key words: ISM: Gum nebula -- stars: pulsars: general

Offprint request: R. Ramachandran, ramach@astro.uva.nl

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