We present Widefield ASKAP L-band Legacy All-sky Blind Survey ( WALLABY ) early science results from the Australian Square Kilometre Array Pathfinder ( ASKAP ) observations of the NGC 7162 galaxy group .
We use archival HIPASS and Australia Telescope Compact Array ( ATCA ) observations of this group to validate the new ASKAP data and the data reduction pipeline ASKAP soft .
We detect six galaxies in the neutral hydrogen ( H i ) 21-cm line , expanding the NGC 7162 group membership from four to seven galaxies .
Two of the new detections are also the first H i detections of the dwarf galaxies , AM 2159-434 and GALEXASC J220338.65-431128.7 , for which we have measured velocities of cz = 2558 and cz = 2727 km s ^ { -1 } , respectively .
We confirm that there is extended H i emission around NGC 7162 possibly due to past interactions in the group as indicated by the 40 ^ { \circ } offset between the kinematic and morphological major axes for NGC 7162A , and its H i richness .
Taking advantage of the increased resolution ( factor of \sim 1.5 ) of the ASKAP data over archival ATCA observations , we fit a tilted ring model and use envelope tracing to determine the galaxies ’ rotation curves .
Using these we estimate the dynamical masses and find , as expected , high dark matter fractions of f _ { \mathrm { DM } } \sim 0.81 - 0.95 for all group members .
The ASKAP data are publicly available .