Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1781v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, June 1990, p. 1781-1788.
Astronomy and Astrophysics
Astronomy
85
Elliptical Galaxies, H I Regions, Radio Galaxies, Very Large Array (Vla), Absorption Spectra, Cosmic Dust, Density Distribution, Emission Spectra
Scientific paper
This paper presents 21-cm line observations made with the VLA of the nearby radio galaxy Centaurus A (NGC 5128). The H I velocities in the inner parts agree well with optical emission-line velocities and indicate that the dust lane is a warped, rotating system. The H I velocities in the outer parts do not agree with this interpretation which may indicate that in the outer regions the gas disk is still unstable and has not yet settled into regular orbits. This then would favor a scenario in which the gas and dust is a recently captured system. The total mass of the galaxy as derived from the H I rotation curve is significantly less than the mass estimate based on X-ray observations.
Haschick Aubrey David
Tubbs A. D.
van der Hulst J. M.
van Gorkom Jacqueline H.
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