A 21-cm line study of NGC 5963, an SC galaxy with a low-surface brightness disk

Details A 21-cm line study of NGC 5963, an SC galaxy with a low-surface brightness disk A 21-cm line study of NGC 5963, an SC galaxy with a low-surface brightness disk

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198..100b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 100-108.

Astronomy and Astrophysics

Astrophysics

14

Brightness Distribution, Radio Galaxies, Spiral Galaxies, Astronomical Maps, Centimeter Waves, Galactic Mass, Galactic Rotation, Hydrogen Clouds, Radial Velocity

Scientific paper

Results are presented from a detailed 21-cm line study of the Sc galaxy NGC 5963. The extent of the H I emission is found to be roughly coincident with the optical image, the latter being of much lower surface brightness than normal for Sc galaxies. The velocity field shows little deviation from axial symmetry, and the derived rotation curve is typical for Sc galaxies about twice as bright as NGC 5963. A composite mass model is presented using the observed light distribution to calculate a rotation curve for the luminous part of the galaxy (assuming a constant M/L-ratio with radius); this calculated rotation curve is compared to the observed one to derive a rotation law for a dark halo. Comparison with Sc galaxies having normal disk surface brightnesses suggests that the halo in NGC 5963 is more concentrated than in normal Scs with similar rotation curves. The origin of the low surface brightness of the disk is discussed.

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