| 18th of May 2021 |
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| WALLABY observations of the Hydra I cluster |
| by Reynolds et al. |
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Reynolds et al. present results from neutral atomic hydrogen (HI)
observations of the Hydra I cluster taken as part of the Widefield
ASKAP L-band Legacy All-sky Blind Survey (WALLABY). The Hydra I
cluster contains 581 optically detected galaxies, of which
51 galaxies are detected in HI emission.
Reynolds et al. consider in detail one of these, ESO
501−G075, that lies near the edge of the cluster and displays an HI
tail directed away from the cluster centre. They conclude that, ESO
501−G075 is likely recently infalling into the cluster and in the
early stages of experiencing ram pressure.
The image shows a arey-scale Pan-STARRS of ESO 501−G075 with overlaid ASKAP HI column density contours. The filled orange circle in the lower left corner shows the ASKAP synthesised beam size. The red dashed rectangle indicates the box used to extract the position-velocity diagram and column density profile examined elsewhere in the paper. The line in the lower right corner indicates a physical scale of 10 kpc for a distance to ESO 501−G075 of 61 Mpc (about 200 million light years). |