| 3rd of June 2015 |
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| The Bluedisks project: a study of unusually HI-rich galaxies |
| by Jing Wang (CASS) |
| The Bluedisk project (Wang et al. 2012, 2013) with the Westerbork Synthesis
Radio Telescope (WSRT) has mapped the HI in a sample of 23 low-redshift
galaxies with unusually high HI mass fractions, along with a similar-sized
sample of control galaxies. The aim is to investigate the link between cold
gas accretion and galactic disk formation in the Local Universe. The advantage
of the sample is that all the target galaxies lie beyond a luminosity distance
of 100 Mpc, and we fully sample the HI environment within a projected distance
of ~1 Mpc (with the ~1 deg primary beam) and systematic velocity of more than
±500 km/s around the target galaxies. A good database to perform pilot
experiments for the large volume that will be detected by WALLABY! The image above shows multi-color optical images of four Bluedisks galaxies from the Sloan Digital Sky Survey (SDSS) overlaid with HI column density contours. |