Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99..298v&link_type=abstract
Astronomy and Astrophysics, vol. 99, no. 2, June 1981, p. 298-304.
Astronomy and Astrophysics
Astrophysics
86
Galactic Structure, Hydrogen Clouds, Mass Distribution, Neutral Gases, Spiral Galaxies, Star Distribution, Hydrogen Atoms
Scientific paper
The thickness of the neutral hydrogen layer in the spiral galaxy NGC 891 is modelled under the assumption that the mass distribution of the disk is similar to that of starlight in the old disk population, or that it is indicated by the rotation curve with all mass in the disk. All calculations are performed as a function of galactocentric radius under the assumption that the gas velocity dispersion is independent of z coordinate. Comparison of simulated Westerbork observations of the calculated gas layers with the observed equivalent width distribution of H I in NGC 891 indicates that within the allowed range of inclinations (greater than or equal to 87.5 deg), the model with mass distribution similar to that of starlight best represents the data, and that a model with all mass in the disk would be difficult to maintain.
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