A Wide-Field H i Study of the NGC 1566 Group?

Received date; accepted date We report on neutral hydrogen observations of a ∼ 5.5 ◦ × 5.5 ◦ field around the NGC 1566 galaxy group with the multibeam narrow-band system on the 64-m Parkes telescope. We detected thirteen H i sources in the field, including two galaxies not previously known to be members of the group, bringing the total number of con-firmed galaxies in this group to 26. Each of the H i galaxies can be associated with an optically catalogued galaxy. No ’intergalactic H i clouds ’ were found to an H i mass limit of ∼ 3.5 × 108 M. We have estimated the expected H i content of the late-type galaxies in this group and find the total detected H i is consistent with our expecta-tions. However, while no global H i deficiency is inferred for this group, two galaxies exhibit individual H i deficiencies. Further observations are needed to determine the gas removal mechanisms in these galaxies