Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..447p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, Feb. 1991, p. 447-455, 746, 747. Research supported by NSERC and Ministere de l
Astronomy and Astrophysics
Astronomy
65
Galactic Clusters, Hydrogen, Astronomical Models, Brightness Distribution, Galactic Rotation, Mass Distribution, Mass To Light Ratios, Very Large Array (Vla)
Scientific paper
A VLA study of the H I properties of the Sculptor group galaxy NGC 55 is presented. The H I distribution is found to be nonsymmetrical with respect to the general light distribution, and a warp of the H I plane is observed on the northwest side. The total H I flux density of 1522 Jy km/s corresponds to an H I mas of 0.9 x 10 to the 9th solar masses. As for the light distribution, the luminosity profile is well determined over 6 mag in surface brightness. The total blue luminosity of 4.2 x 10 to the 9th solar luminosities is much smaller than previously estimated. The rotation curve, derived from a full tilted ring model, rises slowly out to r = 12 arcmin and then stays more or less flat out to r = 22 arcmin. The mass distribution, obtained by fitting a two-component model to the rotation curve, gives a total mass of 1.8 x 10 to the 10th solar masses at the last point of the rotation curve. This value implies a mass-to-light ratio of 4.3.
Carignan Claude
Puche Daniel
Wainscoat Richard J.
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