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25th of October 2019
ASKAP HI imaging of the nearby galaxy IC 5201
by Kleiner et al.
Kleiner et al. present the results of ASKAP observations of the nearby blue, barred spiral galaxy IC 5201. A four-beam mosaicked HI image cube was created from 175 hours of observations made with the Early Science 12-antenna sub-array, achieving a noise level of 1.7 mJy/beam per channel. Nine extragalactic HI detections are made, which includes 5 new HI detections, and the first velocity measurements for 2 galaxies. The detections are IC 5201, 3 dwarf satellite galaxies, 2 galaxies and a tidal feature belonging to the NGC 7232/3 triplet, and 2 potential infalling galaxies to the triplet. The observations were made as part of the a Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) survey.

The image above shows a still from an interactive 3D representation of the HI disk of IC 5201. The figure from the paper can be controlled when opened in Adobe Acrobat. The x, y, and z (red, green and blue) axes correspond to right ascension, declination, and velocity, and there are three (light blue, dark blue and green) surfaces that represent three different HI densities. These three surfaces highlight the warped HI disk, the HI densities that correlate with the stellar disk as well as the HI densities coinciding with the knots of star formation. More details are given in the paper, published in Monthly Notices of the Royal Astronomical Society.

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