Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244....8t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. 8-26. Research supported by ASTRON and University o
Astronomy and Astrophysics
Astrophysics
63
Galactic Structure, H Alpha Line, Interstellar Matter, Radio Telescopes, Spiral Galaxies, Emission Spectra, Galactic Rotation, Hydrogen Atoms, Radiative Transfer, Star Formation
Scientific paper
The H I and H-alpha emission lines in the grand-design spiral galaxy M51 were observed with the Westerbork Synthesis Radio Telescope and the Taurus Fabry-Perot imaging spectrometer, respectively. Strong tangential and radial streaming motions across the inner spiral arms in the ionized gas were detected. The deviations from circular rotations are found to have rotations that agree qualitatively with predictions of the gas flow in galactic disks under the effect of a density wave. It is shown that a simple qualitative model of the dissociation-recombination process is capable of yielding the observed H I column densities in the arms.
Allen Rosalind J.
Tilanus Remo P. J.
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