Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..181c&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 2, July 1977, p. 181-187.
Astronomy and Astrophysics
Astrophysics
35
Hydrogen Atoms, Hydrogen Clouds, Neutral Particles, Spiral Galaxies, Astronomical Maps, Astronomical Models, Contours, Density Distribution, Gas Density, H Alpha Line, Ionized Gases, Point Sources, Velocity Distribution
Scientific paper
Results are reported for mapping of the Sc galaxy NGC 253 in the 21-cm H I line with a two-element interferometer at a resolution of 2 by 3 arcmin. The H I density distribution in this galaxy is determined, the H I mass is estimated to be 4.9 billion solar masses, and good coincidence is found between the H I map and a photograph of the optical object. A pronounced central maximum in H I surface density is observed, and kinematic parameters are derived from a model rotation curve. A total mass of 90 billion solar masses within the radius containing 80% of the neutral hydrogen is suggested along with an M/L ratio of 2.7 within the same radius. Comparison of the radio results with H-alpha observations indicates that the ionized gas apparently rotates faster than the neutral gas in a region where the spiral structure is most conspicuous, which is consistent with the streaming motions expected from density-wave theory.
Combes François
Gottesman Stephen T.
Weliachew L.
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