A model for the galactic free electrons distribution.

Details A model for the galactic free electrons distribution. A model for the galactic free electrons distribution.

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ign..confe..26g&link_type=abstract

Ionized Gaseous Nebulae. Mexico City November 21- 24, 2000, meeting abstract

Computer Science

Scientific paper

We used a set of 70 pulsars with approximately known distances to fit a smoo th two component model of the distribution of galactic electrons. When we consider only this set of pulsars, the reasons for considering a more complicated model are not obvious. The resulting model components have mean local midplane densities of 2.15 × 10-2 cm-3 and 0.36 × 10-2 cm-3, and exponential scale heights of 0.94 and 0.053 kpc, consistent with Reynolds (1991). The first component have a very large scale length, while the second drops after 1 kpc. We prefer a model which varies as sech2(x), rather than exp(-x), in both the radial and vertical direction, whose fit parameters essentially describe the same electron distribution. Using deviations of the observed dispersion measures from this smooth model, we find evidence for the two interior spiral arms at 2 and 5 kpc.

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