Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..201v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 201-214. ZWO-supported research.
Astronomy and Astrophysics
Astrophysics
35
Galactic Evolution, Galactic Structure, Gas Dynamics, H I Regions, Hydrogen Atoms, Astronomical Maps, Centimeter Waves, Gas Density, Lenticular Bodies, Mass Distribution, Stellar Mass Ejection
Scientific paper
The gas-rich S0 galaxy NCC 4203 was mapped in the 21-cm H I line with a spatial resolution of 24" x 44" (α x δ) and a velocity resolution of 33 km s-1. The H I gas distribution shows an, almost circular, inner ring, in circular rotation in the plane of the optical disk, and an extended outer component. A warped-disk model for the H I distribution is adopted, which contains an intrinsically circular outer pseudo-ring, rotating in a plane inclined 34° (or 87°) to the optical disk. Such a model gives an essentially flat rotation curve out to 10 disk scale lengths. The total mass-to-light ratio for a simple spherical mass model is MT/LB = 8 Msun/Lsun within R = 23 kpc. A detailed disk/bulge/halo mass model fit to the rotation curve shows the presence of a dark halo and a dark to luminous mass ratio of ˜4. Various scenarios for the origin and evolution of the gaseous component in NGC 4203 are discussed. No firm conclusion is reached, but the preferred scenario is an external origin for the H I gas in NGC 4203, i. e. accretion from another galaxy.
Driel Wim van
Gallagher John S. III
Schwarz Ulrich J.
van Woerden Hugo
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