Left: Radio image of neutral hydrogen in and around NGC 4532 / DDO 137 using ASKAP. Right: an optical image of the galaxy pair from the Legacy Surveys. Credit: ICRAR and D.Lang (Perimeter Institute).
NGC_4897_composite
NGC4632
Combined optical and radio image of polar ring galaxy candidate NGC 4632. Image Credit: J. English (U.Manitoba), with support of N. Deg (Queen’s U.) and the WALLABY team; CSIRO/ASKAP radio telescope, NAOJ/Subaru Telescope.
FRB_host_galaxy
Optical image of the host galaxy of FRB 20211127I. The red ellipse marks the location of the FRB while the white contours show the neutral hydrogen gas detected by WALLABY.
WALLABY_science_Hydra_cluster_2
HI countours from WALLABY (blue) overlaid on a Pan-STARRS image (grey-scale) of ESO 501−G075 near the edge of the Hydra cluster (Reynolds et al., 2021, MNRAS, 505, 1891). The galaxy displays an HI tail directed away from the cluster centre. Credit: Tristan Reynolds.
WALLABY_science_Hydra_cluster
WALLABY-detected galaxies in the Hydra cluster (Wang et al., 2021, ApJ, 915, 70). The HI column density images are shown in different slices of velocity offset from the cluster center (∆vrad) around the X-ray halo of Hydra (grey-scale). The column density images are enlarged by a factor of 5 for clarity. Credit: Jing Wang.
WALLABY_dark_galaxies_2
HI column density contours (left) and HI spectrum (right) of a dark HI cloud overlaid on a deep optical image from the DECam Legacy Survey (Wong et al., 2021, MNRAS, 507, 2905). The bright optical galaxy is a background object unrelated to the foreground HI cloud. Credit: Ivy Wong.
WALLABY_dark_galaxies_1
HI column density contours (left) and HI spectrum (right) of a dark HI cloud overlaid on a deep optical image from the DECam Legacy Survey (Wong et al., 2021, MNRAS, 507, 2905). The bright optical source near the cloud is an intervening foreground star. Credit: Ivy Wong.
