A Blind HI Survey in the Great Attractor Region.


S. Juraszek
, PASA, 16 (1), in press.
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Discussion

The HI galaxies detected in the Parkes multibeam ZOA Survey are usually all undetectable in the optical. Considering that we are only looking at 16% of the final survey data for this region and are rejecting sources below 3$\sigma$ rms noise, we have detected a significant number of galaxies. Preliminary results from the first full sensitivity ZOA Survey data cube in this region suggests that we can detect 1 galaxy per square degree. Multibeam HI observations are proving to be an efficient way to discover previously unknown galaxies. Once detected, we also obtain redshift, distance, HI mass and, in some cases, HI diameter information at the same time. The derived properties (HI mass, diameter, total mass) for the 42 galaxies detected in this region are comparable to those of nearby optically-selected samples of spiral galaxies. The infrared properties are also representative of a nearby, optically selected sample.
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