The diameter/rotational velocity dependence for disk galaxies

Details The diameter/rotational velocity dependence for disk galaxies The diameter/rotational velocity dependence for disk galaxies

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pazh...13..174z&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 13, no. 3, 1987, p. 174-181. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

2

Angular Velocity, Diameters, Disk Galaxies, Galactic Evolution, Spectral Line Width

Scientific paper

A diagram {rotational velocity (Vm) - diameter (D0)} obtained for different types of galaxies is discussed. The value of Vm taken from rotation curves and from H I-linewidth WH are considered separately. Galaxies of early (Sa-Sbc) types have in average a higher mean velocity of rotation than late-type galaxies of similar diameters. Velocities Vm obtained from WH for giant S0-Sab-galaxies are often underestimated which may be caused by an asymmetric clumpy distribution of H I in these galaxies. The relation (ln Vm - ln D0) is nearly absent for galaxies with D0 > 30 kpc: except a few cases Vm does not exceed 350 km/s for any value of D0.

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