Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..317v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 317-332. Research supported by NWO.
Astronomy and Astrophysics
Astronomy
34
Galactic Structure, Hydrogen Atoms, Lenticular Bodies, Spatial Distribution, Spiral Galaxies, Dwarf Galaxies, Galactic Evolution, Infrared Astronomy, Velocity Distribution
Scientific paper
The distribution and motions of the H I gas in the SB0 galaxy NGC3941 and the peculiar Virgo Cluster S0 galaxy NGC4694 have been mapped. Optically, NGC3941 is a normal-looking SB0 galaxy. NGC3941 is a relatively gas-rich lenticular. The H I distribution shows a pronounced central hole, an incomplete circular inner ring of 5 kpc radius, and an outer ring of 12 kpc radius, and an axial ratio of 0.6. If the warped H I disk model is adopted, the H I rotation curve is roughly flat at a rotation speed of about 160 km/s. Assuming a simple spherical mass model, the rotation curve gives M(T)/L(B) = 9 solar mass/solar luminosity within R = 16 kpc, a normal value for an S0 galaxy. Optically, NGC4694 is a peculiar S0 galaxy just outside the core of the Virgo Cluster. The H I distribution shows a small condensation of H I in the center of NGC4694 and a linear tail with a projected length of about 40 kpc pointing toward the center of the S0. The galaxy is not very gas-rich. Evolutionary scenarios for both galaxies are considered.
Driel Wim van
van Woerden Hugo
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