Rotation-curves of galaxies from 21 cm-line observations

Details Rotation-curves of galaxies from 21 cm-line observations Rotation-curves of galaxies from 21 cm-line observations

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..259h&link_type=abstract

Astronomy and Astrophysics, vol. 45, no. 2, Dec. 1975, p. 259-268.

Astronomy and Astrophysics

Astronomy

66

Galactic Rotation, Galactic Structure, Hydrogen, Radio Sources (Astronomy), Astronomical Catalogs, Curves (Geometry), Intergalactic Media, Mass Distribution, Statistical Correlation

Scientific paper

High-sensitive single dish observations of the 21 cm-line emission of the neutral hydrogen in the fainter outer regions of the H I distribution yielded extended rotation curves for 8 nearby galaxies. Some of these galaxies show a well-determined turn-over point and clearly a descending outer part in their rotation curve. Some curves seem to descend very slowly which would be expected in case of galaxies with a massive disk or with an extended halo. There are indications of noncircular motions in these remote areas of galaxies. The ratio of the radius (Rmax) of the maximum rotational velocity to the Holmberg radius (RHo) shows a correlation with the galaxy's morphological type in the sense that this parameter is an increasing function with morphological type: Rmax/RHo about 0.3 for Sab to Rmax/RHo about 2 for Ir type galaxies.

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