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22nd of January 2019
ASKAP images of the NGC 7232 galaxy group (Part 2)
by Karen Lee-Waddell
Lee-Waddell et al. (2019) have used the Australian Square Kilometre Array Pathfinder (ASKAP) to detect HI in the NGC 7232 galaxy group. The observations were taken on behalf of WALLABY (the Widefield ASKAP L-band Legacy All-sky Blind surveY) using 12 ASKAP antennas during various commissioning and Early Science phases of the array. The left panel shows ASKAP total HI intensity contours superimposed on a DSS2 coloured optical image of the NGC 7232/3 triplet. The combination of HI and optical imaging provides a more complete picture of dynamics occurring within the system. Three HI peaks coincide with the stellar components of the major galaxies in the triplet. Two additional HI clouds, C5 and C6, are clearly visible in the intervening region connecting the northern spiral, NGC 7232B, to the other two galaxies NGC 7232 and NGC 7233. It is likely that C6 is a progenitor of a long-lived tidal dwarf galaxy. The right panel shows the ASKAP HI velocity map of the NGC 7232/3 triplet showing coherent structure that is connecting the galaxies as they interact with one another.

Reference: K. Lee-Waddell, B.S. Koribalski, T. Westmeier, A. Elagali, B.-Q. For, D. Kleiner, J.P. Madrid, A. Popping, T. N. Reynolds, J. Rhee, P. Serra, L. Shao, L. Staveley-Smith, J. Wang, M.T. Whiting, O.I. Wong, J.R. Allison, S. Bhandari, J.D. Collier, G. Heald, J. Marvil, S.M. Ord, 2019, MNRAS, in press (arXiv:1901.00241)

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