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Tracking dispersion measure variations of timing array pulsars with the GMRT

Published online by Cambridge University Press:  20 March 2013

Ujjwal Kumar ,
Yashwant Gupta ,
Willem van Straten ,
Stefan Osłowski ,
Jayanta Roy ,
N. D. R. Bhat ,
Matthew Bailes  and
Michael J. Keith
Ujjwal Kumar
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Postbag 3, India411007 email: ujjwal@ncra.tifr.res.in
Yashwant Gupta
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Postbag 3, India411007 email: ujjwal@ncra.tifr.res.in
Willem van Straten
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Australia
Stefan Osłowski
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Australia Australia Telescope National Facility, CSIRO, Australia
Jayanta Roy
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Postbag 3, India411007 email: ujjwal@ncra.tifr.res.in
N. D. R. Bhat
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Australia International Centre for Radio Astronomy Research, Curtin University, Australia
Matthew Bailes
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Australia
Michael J. Keith
Affiliation:
Australia Telescope National Facility, CSIRO, Australia
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Abstract

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We present the results from nearly three years of monitoring of the variations in dispersion measure (DM) along the line-of-sight to 11 millisecond pulsars using the Giant Metrewave Radio Telescope (GMRT). These results demonstrate accuracies of single epoch DM estimates of the order of 5 × 10−4 cm−3 pc. A preliminary comparison with the Parkes Pulsar Timing Array (PPTA) data shows that the measured DM fluctuations are comparable. We show effects of DM variations due to the solar wind and solar corona and compare with the existing models.

Keywords

(stars:) pulsars: generalISM: generalSun: corona

References

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