Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..539f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, June 15, 1985, p. 539-558.
Astronomy and Astrophysics
Astronomy
15
Galactic Structure, Hydrogen Clouds, Radial Velocity, Spiral Galaxies, Astronomical Maps, Asymmetry, Density Wave Model, Velocity Distribution
Scientific paper
On the basis of recently published H I data, and new radial velocity fields from improved rotation curves, expansion terms and spiral density-wave perturbations, the authors show that the so-called rolling motion phenomenon is only partly explained by geometric effects. They use an improved method and a new warp model to correct the observed velocity gradients for these apparent rolling motions. In all spiral arms, real velocity gradients perpendicular to the galactic plane are detected, with typical values of ±20 km s-1kpc-1 and values reaching -75 km s-1kpc-1 in some localized regions. The phenomenon is also observed in CO measurements. The results agree well with previous H I work.
Feitzinger Johannes Viktor
Spicker J.
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