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17th of August 2021
WALLABY observations of the Eridanus supergroup
by B-Q For et al.
For et al. present observations of the Eridanus supergroup obtained with the Australian Square Kilometre Array Pathfinder (ASKAP) as part of the pre-pilot survey for the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY). The total number of detected neutrral hydrogen (HI) sources is 55, of which 12 are background galaxies not associated with the Eridanus supergroup. The image above shows results for NGC 1398. The synthesised beam of 30 arcsec x 30 arcsec is plotted at the left bottom corner of each sub-plot as a reference. The left image is the integrated HI column density map overlaid onto the DR8 DESI Legacy Imaging Survey g-band stacked images. The colour scale of blue, orange, red, purple, and olive green represent the contour levels of 1, 2, 5, 10, 20×10^20 cm−2, respectively. The middle image is the 1st moment velocity field map. The right plot is the spectra derived by the SOFIA software package, where the grey area represents the upper and lower limit of uncertainties. NGC 1398 has a ring like HI that resembles a similar feature as seen in NGC 1533, which may have formed as a result of an unequal-mass merging event between gas-rich low surface brightness galaxies and host galaxy’s disk. NGC 1398 is located at the edge of the observed field and furthest from the Eridanus group centre.

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