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.
map_norma_small
False-colour image of high-velocity clouds
All-sky map of HVCs
A false-colour all-sky map combining the column density and radial velocity of high-velocity neutral hydrogen gas detected by the HI4PI survey. Brightness corresponds to column density and hue to radial velocity.
Anti-centre complex
A comparison of the high-velocity neutral hydrogen gas detected by the Leiden/Argentine/Bonn (LAB) survey and the new HI4PI survey for the same region of the sky, showing the great improvement in resolution and spatial sampling of the new map.