NGC5128 - A galaxy with a recently formed disk

Details NGC5128 - A galaxy with a recently formed disk NGC5128 - A galaxy with a recently formed disk

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297...38m&link_type=abstract

Nature, vol. 297, May 6, 1982, p. 38-42.

Computer Science

29

Disk Galaxies, Galactic Evolution, Radio Galaxies, Spiral Galaxies, Elliptical Galaxies, Fabry-Perot Interferometers, Galactic Nuclei, Galactic Rotation, Galactic Structure, H Alpha Line, Hydrogen Clouds, Ionized Gases, Velocity Distribution

Scientific paper

The galaxy NGC5128, better known as the powerful radio source Centaurus A, is a puzzling object appearing as an elliptical galaxy crossed by a dense lane of dust and gas. Its structure and evolution are not well understood, although this object is quite near (5 Mpc following Burbidge and Burbidge, 1959, is adopted), bright, and has been widely observed in the past few years. The first complete velocity field of the ionized gas in NGC5128, with a 10-km/s precision, is obtained from Perot-Fabry interferometry with the ESO 3.6-m telescope. It shows that the gas is rotating in a thick disk (approximately 1 kpc thickness), without any evidence of the perturbations expected from the encounter of an elliptical and a spiral galaxy. The observations favor the hypothesis of the evolution of a spiral galaxy in which the formation of the disk is very late compared with the bulge.

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