Density Distribution of the Warm Ionized Medium

Details Density Distribution of the Warm Ionized Medium Density Distribution of the Warm Ionized Medium

2007-01-16

arxiv.org/abs/astro-ph/0701477v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the "SINS - Small Ionized and Neutral Structures in the Diffuse Interstellar Medium" conferenc

Scientific paper

Observations of Halpha emission measures and pulsar dispersion measures at high Galactic latitude (|b| > 10 deg) provide information about the density and distribution of the diffuse warm ionized medium (WIM). The diffuse WIM has a lognormal distribution of EM sin |b|, which is consistent with a density structure established by isothermal turbulence. The H+ responsible for most of the emission along high-EM sin |b| sightlines is clumped in high density (> 0.1 cm^{-3}) regions that occupy only a few parsecs along the line of sight, while the H+ along low-EM sightlines occupies hundreds of parsecs with considerably lower densities.

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