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SINGG -- the Survey of Ionization in Neutral Gas Galaxies --
entailed optical imaging of 468 HIPASS detections.
Inspection of the SINGG images revealed 15
fields that had four or more emission line galaxies within the 15 arcminute
HIPASS beam, and these SINGG groups were naturally named "Choirs"!
Dzudzar et al. have used the ATCA to study the HI content of
Choir groups.
The image above shows the the velocity field of the HIPASS J0205-55 group in the limit from 5600
to 6660 km/s, for the Choir group galaxies shown in yesterday's ADAP.
Panels of the
HI spectra for each detected galaxy in the J0205-55 group.
The enhanced colour shows where the spectrum was integrated.
The double-horned HI profiles typify giant spiral disks and indicate rotationally supported disks.
More details are give in
the paper by Dzudzar et al.,
published in Monthly Notices of the Royal Astronomical Society.
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