Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1723h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.23; Bulletin of the American Astronomical Society, V
Other
Scientific paper
Observations of Hα emission measures and pulsar dispersion measures at high Galactic latitude (|b| > 10°) provide information about the density and distribution of the diffuse warm ionized medium (WIM). We use data from the Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey. We have removed sightlines that intersect classical HII regions, leaving a sample of only the diffuse WIM. The diffuse WIM has a lognormal distribution of EM sin |b|, which is consistent with a density structure established by isothermal turbulence. A comparison of pulsar dispersion measures with emission measures shows that the H+ responsible for most of the emission along high-EM sightlines is clumped in high density (> 0.2 cm^-3) regions that occupy only of order 10 parsecs along the line of sight and contribute little to the total H+ column density, while the H+ along low-EM sightlines occupies hundreds of parsecs with densities of 0.03 0.1 cm^-3. We find an approximate power law relationship between local density of the gas and occupation length.
WHAM is supported by NSF grant AST 02-04973.
Benjamin Robert A.
Haffner Matthew L.
Hill Alex S.
Reynolds Ron J.
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