Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..845d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 845-856.
Astronomy and Astrophysics
Astronomy
41
Astronomical Spectroscopy, Galactic Rotation, Gas Dynamics, Radial Velocity, Radio Galaxies, Emission Spectra, Galactic Structure, Line Spectra, Neutral Gases, Spectrophotometry
Scientific paper
Optical observations of the S0 galaxy IC 5063 are presented, and include low resolution (9A) spectrophotometry of the central nuclear region (obtained with an image-dissector-scanner) and higher resolution (0.6 - 1.0 A) long slit spectra at a dispersion of 30 A/mm (obtained with the IPCS), where several different orientations of the slit on the galaxy are employed to study the dynamic effects. An intense hot source is observed at the center of IC 5063, photoionizing both its immediate surroundings and regions of the gaseous disk at large distances from the center. Circular motion in the gaseous disk, with an observed amplitude of 185 km/s and a real amplitude of 226 km/s are also reported. The rotation curve of the disk remains flat out to the furthest observed point at 10 kpc. Interior to 1 kpc, the stellar component appears to be rotating with an observed amplitude of 125 km/s, which implies a rotational velocity similar to that of the gaseous disk at the same radial distance. Radio continuum observations at 21 cm are reported. It is concluded that IC 5063 is a system made up of a spheroidal distribution of late-type stars and a gaseous disk.
Danziger Ivan John
Goss William Miller
Wellington Kelvin J.
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