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Title:
Pulsar distances and the galactic distribution of free electrons
Authors:
Taylor, J. H.; Cordes, J. M.
Affiliation:
AA(Princeton Univ., NJ), AB(Cornell Univ., Ithaca, NY)
Publication:
Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 674-684. (ApJ Homepage)
Publication Date:
07/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astrometry, Electron Density (Concentration), Free Electrons, Galactic Structure, H Ii Regions, Pulsars, Astronomical Models, Extragalactic Radio Sources, Interstellar Matter, Milky Way Galaxy
DOI:
10.1086/172870
Bibliographic Code:
1993ApJ...411..674T

Abstract

The present quantitative model for Galactic free electron distribution abandons the assumption of axisymmetry and explicitly incorporates spiral arms; their shapes and locations are derived from existing radio and optical observations of H II regions. The Gum Nebula's dispersion-measure contributions are also explicitly modeled. Adjustable quantities are calibrated by reference to three different types of data. The new model is estimated to furnish distance estimates to known pulsars that are accurate to about 25 percent.

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