Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...153..218c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 153, no. 1, Dec. 1985, p. 218-234.
Astronomy and Astrophysics
Astrophysics
40
Spiral Galaxies, Virgo Galactic Cluster, Density Distribution, Galactic Rotation, H Alpha Line, Hydrogen, Luminosity, Mass Distribution
Scientific paper
The authors present the first results of a study on a sample of spiral galaxies in Virgo and A 1060. They show that H I deficient cluster galaxies, and non-deficient galaxies, have rotation curves with characteristics similar to those of non-cluster galaxies. There seems to be an indication of a correlation between the H I galaxian diameter and the extension of the region over which H II is detected. The mass to luminosity ratio increases outward and, at a distance of about 10 kpc from the galaxian center, it is about M/LB = 5 M_sun;/LB_sun;. If the non-luminous mass distribution is approximated by an isothermal sphere, it is found that the visible mass is about 15% of the total galaxian mass. An extended Hα feature detected in monochromatic imagery of the galaxy NGC 4438 is interpreted as due to the bow-shock generated by the motion of the galaxy in the intergalactic medium.
Chincarini Guido
de Souza Ronaldo
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