First results of a survey of neutral hydrogen in 500 southern galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Galactic Radiation, Galactic Structure, Hydrogen, Astronomical Catalogs, Photographic Plates, Schmidt Telescopes, Spatial Distribution, Velocity Distribution

Scientific paper

Observations of the 21-cm line of neutral hydrogen can provide several integral properties of galaxies, the systemic velocity indicating the distance via the Hubble relation or through group membership. The integral over the flux density profile immediately yields the amount of neutral hydrogen in the galaxy. In the study described, the Parkes 64-m telescope, with a beamwidth of 15 seconds of arc, was used in combination with a 1024-channel auto-correlation spectrometer to survey neutral hydrogen in southern galaxies. The hydrogen distribution and velocity field are mapped for several dozen objects, so that the hydrogen diameter and rotation axis may be determined. In the analysis, priority is given to lenticular galaxies.

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