Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190..689n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 190, Mar. 1980, p. 689-709. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
136
Astronomical Maps, Galactic Structure, Hydrogen Clouds, Spiral Galaxies, Astronomical Photography, High Resolution, Interstellar Gas, Neutral Beams, Radial Distribution, Radial Velocity, Velocity Distribution
Scientific paper
Observations of neutral hydrogen (H I) in the galaxy M33 are presented which have sufficient angular resolution (47 x 93 arcsec) in order to distinguish detailed H I spiral structure for the first time. H I spiral features extend over the entire disk; the pattern is broken and multi-armed with the best-defined arms lying at radii outside the brightest optical features. The only direct evidence for the presence of a density-wave in M33 is derived from the morphology of the inner southern arm. The radial velocity field, with resolution 16 km/s, is perturbed near the inner spiral arms. These perturbations agree with the predictions of density-wave theory but may simply arise from the self-gravity of massive arms whether or not they are a quasi-stationary wave phenomenon. If the outer spiral features form a rigidly rotating density-wave pattern, the absence of large radial streaming motions along the features implies a small pattern speed, with corotation in the outer parts of the disk.
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