Pulsar distances and the galactic distribution of free electrons

@article{Taylor1993PulsarDA,
  title={Pulsar distances and the galactic distribution of free electrons},
  author={Joseph H. Taylor and James M. Cordes},
  journal={The Astrophysical Journal},
  year={1993},
  volume={411},
  pages={674-684}
}
We describe a quantitative model for the distribution of free electrons in the Galaxy, with particular emphasis on its utility for estimating pulsar distances from dispersion measures. Contrary to past practice, we abandon the assumption of an axisymmetric Galaxy. Instead, we explicitly incorporate spiral arms, the shapes and locations of which are derived from existing radio and optical observations of H II regions. Additional parameters of the model include the electron densities of outer and… 
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