On the structures of HII regions and their distribution in the galaxy

Details On the structures of HII regions and their distribution in the galaxy On the structures of HII regions and their distribution in the galaxy

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........2l&link_type=abstract

Ph.D. Thesis Massachusetts Univ., Amherst.

Astronomy and Astrophysics

Astronomy

2

Distribution (Property), Galaxies, H Ii Regions, Hydrogen, Line Spectra, Observation, Radio Astronomy, Density Wave Model, Dynamic Models, Hydrogen Recombinations, Ionized Gases, Kinematics, Nebulae, Solar System

Scientific paper

The use of radio recombination lines to determine structure HII regions and the distribution HII regions in the Galaxy is addressed. The formation and transfer of radio recombination lines are treated and various processes that effect the ability to deduce nebular properties from radio observations are examined. The distribution of dense HII regions is derived using kinematic models based on circular rotation and density wave theory. A survey of less dense ionized gas is described. The absence of HII regions from large areas of the Galaxy that are well populated by atomic and molecular clouds indicates that the formation of massive stars does not result simply from the presence of molecular clouds, but requires an additional factor like a density wave.

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