Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993azh....70..480p&link_type=abstract
Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 70, no. 3, p. 480-491.
Astronomy and Astrophysics
Astronomy
12
Emission Spectra, H Ii Regions, Interstellar Radiation, Milky Way Galaxy, Electron Density (Concentration), Molecular Clouds, Pulsars
Scientific paper
An empirical dependence between the emission measure (EM) and the dispersion measure (DM) in the interstellar medium is obtained. This dependence is approximated by the function EM varies as (DM)-squared for DM greater than 25 pc/cu cm. The obtained dependence corresponds to the ionized gas distribution model, in which the variations of EM and DM are due to variations of the electron density rather than the distance. Ratios of EM and DM for 67 directions in the Galaxy imply that the ionized gas is clumped into clouds. The parameters of these clouds differ greatly for the diffused ionized gas inside and outside the spiral arms. It is concluded that the classical H II regions and the ionized gas clouds of the Galactic background are of identical origin.
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