WALLABY Early Science – II. The NGC 7232 galaxy group. (arXiv:1901.00241v1 [astro-ph.GA])

WALLABY Early Science – II. The NGC 7232 galaxy group. (arXiv:1901.00241v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lee_Waddell_K/0/1/0/all/0/1">K. Lee-Waddell</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koribalski_B/0/1/0/all/0/1">B.S. Koribalski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Westmeier_T/0/1/0/all/0/1">T. Westmeier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Elagali_A/0/1/0/all/0/1">A. Elagali</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+For_B/0/1/0/all/0/1">B.-Q. For</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kleiner_D/0/1/0/all/0/1">D. Kleiner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Madrid_J/0/1/0/all/0/1">J.P. Madrid</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Popping_A/0/1/0/all/0/1">A. Popping</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reynolds_T/0/1/0/all/0/1">T.N. Reynolds</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rhee_J/0/1/0/all/0/1">J. Rhee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Serra_P/0/1/0/all/0/1">P. Serra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shao_L/0/1/0/all/0/1">L. Shao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Staveley_Smith_L/0/1/0/all/0/1">L. Staveley-Smith</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_J/0/1/0/all/0/1">J. Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Whiting_M/0/1/0/all/0/1">M.T. Whiting</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wong_O/0/1/0/all/0/1">O.I. Wong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Allison_J/0/1/0/all/0/1">J.R. Allison</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bhandari_S/0/1/0/all/0/1">S. Bhandari</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Collier_J/0/1/0/all/0/1">J.D. Collier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Heald_G/0/1/0/all/0/1">G. Heald</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marvil_J/0/1/0/all/0/1">J. Marvil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ord_S/0/1/0/all/0/1">S.M. Ord</a>

We report on neutral hydrogen (HI) observations of the NGC 7232 group with
the Australian Square Kilometre Array Pathfinder (ASKAP). These observations
were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind
surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas
equipped with Phased Array Feeds, which were used to form 36 beams to map a
field of view of 30 square degrees. Analyzing a subregion of the central beams,
we detect 17 HI sources. Eleven of these detections are identified as galaxies
and have stellar counterparts, of which five are newly resolved HI galaxy
sources. The other six detections appear to be tidal debris in the form of HI
clouds that are associated with the central triplet, NGC 7232/3, comprising the
spiral galaxies NGC 7232, NGC7232B and NGC7233. One of these HI clouds has a
mass of M_HI ~ 3 x 10^8 M_sol and could be the progenitor of a long-lived tidal
dwarf galaxy. The remaining HI clouds are likely transient tidal knots that are
possibly part of a diffuse tidal bridge between NGC 7232/3 and another group
member, the lenticular galaxy IC 5181.

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