H I studies of the Sculptor group galaxies. V, NGC 253

A study of the H I properties and mass distribution of the Sculptor group galaxy NGC 253, from VLA obserations, is presented. The detected H I disk is fairly small with a diameter of about 0.8 D HO. The rotation curve, derived from the velocity field using a full tilted ring model, is still rising a...

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Bibliographic Details
Published in:The Astronomical journal 1991-02, Vol.101 (2), p.456-464
Main Authors: PUCHE, D, CARIGNAN, C, VAN GORKOM, J. H
Format: Article
Language:English
Subjects:
640105 - Astrophysics & Cosmology- Galaxies
Astronomy
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
DISTRIBUTION
Earth, ocean, space
Exact sciences and technology
GALAXIES
GALAXY CLUSTERS
H1 REGIONS
MASS
MASS DISTRIBUTION
MATHEMATICAL MODELS
MOTION
NONLUMINOUS MATTER
Normal galaxies. Extragalactic objects and systems (by type)
ROTATION
SPATIAL DISTRIBUTION
SPIRAL CONFIGURATION
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary:A study of the H I properties and mass distribution of the Sculptor group galaxy NGC 253, from VLA obserations, is presented. The detected H I disk is fairly small with a diameter of about 0.8 D HO. The rotation curve, derived from the velocity field using a full tilted ring model, is still rising at the last observed point. The maximum observed rotation velocity is 224 km/s at a radius of 8.5 kpc. From this analysis, a systematic velocity of 245 km/s, a mean inclination of 72 deg, and a mean position angle of 229 deg are derived. The study of the mass distribution shows that a two-component (luminous and dark) mass model is needed to explain the observed rotation curve over the whole radius range. (Author)
ISSN:0004-6256
1538-3881
DOI:10.1086/115696