Pulsar distances and the galactic distribution of free electrons

Details Pulsar distances and the galactic distribution of free electrons Pulsar distances and the galactic distribution of free electrons

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..674t&link_type=abstract

Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 674-684.

Astronomy and Astrophysics

Astrophysics

936

Astrometry, Electron Density (Concentration), Free Electrons, Galactic Structure, H Ii Regions, Pulsars, Astronomical Models, Extragalactic Radio Sources, Interstellar Matter, Milky Way Galaxy

Scientific paper

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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