The giant spiral galaxy M 101. VII - Associations of H I concentrations and H II complexes

Details The giant spiral galaxy M 101. VII - Associations of H I concentrations and H II complexes The giant spiral galaxy M 101. VII - Associations of H I concentrations and H II complexes

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104..127v&link_type=abstract

Astronomy and Astrophysics, vol. 104, no. 1, Dec. 1981, p. 127-141. Research supported by the European Space Agency.

Astronomy and Astrophysics

Astrophysics

42

Interstellar Gas, Mass Distribution, Spiral Galaxies, Emission Spectra, Gas Density, H Ii Regions, Hydrogen Atoms, Hydrogen Ions

Scientific paper

New observational data on the H I/H II associations in M 101 are presented, and the physical parameters of the complexes are derived. The brightest concentrations of H I are up to 2 kpc with H I masses of 20-90 x 10 to the 6th solar masses, are of relatively low mean H I density, and are found near optically prominent giant H II complexes. Smaller and more dense H I concentrations are associated with optically less prominent H II regions. In the inner parts of the galaxy at radius less than 14 kpc, the largest H I/H II associations are elongated along the spiral arms, while at larger radii their shapes are more circular and their mass distributions more centrally condensed. The observed global properties are combined into an index which is related to the efficiency of star formation, and is well correlated with the optical emission line strength ratio of forbidden lines O III/H-beta.

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