Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..123f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 123-135.
Astronomy and Astrophysics
Astrophysics
33
Interstellar Matter, Pulsars, Wave Propagation, Cosmic Plasma, Electron Density (Concentration), Interstellar Gas
Scientific paper
Interstellar propagation effects on the arrival time precision of radio pulsars are simulated. It is found that, for a Kolmogorov electron-density turbulence spectrum, time of arrival pertubations are dominated by dispersion measure variations at radio frequencies above several hundred MHz. Dual-frequency observations can be used to remove dispersion measure variations to obtain submicrosecond residuals. The remaining residuals are highly correlated with the angle-of-arrival variations. Fitting for a nonlambda-squared term does improve the final residuals, although it does not appear to improve the measurement of the astrometric terms of proper motion and parallax. Frequent sampling with a small antenna is better for allowing removal of propagation effects and measuring proper motion and parallax in timing data the coarse sampling with a larger antenna.
Cordes James M.
Foster Roger S.
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