Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232
  galaxy group   We report the discovery of large amounts of previously undetected cold
neutral atomic hydrogen (\HI) around the core triplet galaxies in the nearby
NGC~7232 galaxy group with MeerKAT. With a physical resolution of $\sim$1 kpc,
we detect a complex web of low surface brightness \HI\ emission down to a
4$\sigma$ column density level of $\sim$1 $\times$ 10$^{19}$ cm$^{-2}$ (over 44
\kms ). The newly discovered H\,{\sc i} streams extend over $\sim$20 arcmin
corresponding to 140~kpc in projection. This is $\sim$3 times the \HI\ extent
of the galaxy triplet (52 kpc). The \HI\ debris has an \HI\ mass of $\sim$6.6
$\times 10^9$~M$_{\odot}$, more than 50\% of the total \HI\ mass of the
triplet. Within the galaxy triplet, NGC~7233 and NGC~7232 have lost a
significant amount of \HI\ while NGC~7232B appears to have an excess of \HI.
The \HI\ deficiency in NGC~7232 and NGC~7233 indicates that galaxy-galaxy
interaction in the group concentrates on this galaxy pair while the other disc
galaxies have visited them over time. In comparison to the AMIGA sample of
isolated galaxies we find that with regards to its total \HI\ mass the
NGC~7232/3 galaxy triplet is not \HI\ deficient. Despite the many interactions
associated to the triplet galaxies, no \HI\ seems to have been lost from the
group (yet).

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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: cs