X-raying the galaxy pair Arp 41: no collision in NGC 1232 and three
  ultraluminous sources in NGC 1232A
  We studied the apparent galaxy pair NGC 1232 / NGC 1232A with Chandra,
looking for evidence of interactions and collisions. We report that there is no
cloud of diffuse emission in NGC 1232, contrary to previous claims in the
literature. Instead, we find that the small "companion" galaxy NGC 1232A
contains three ultraluminous X-ray sources (ULXs) with peak 0.3-10 keV
luminosities above 10^{40} erg/s (assuming a cosmological distance of 93 Mpc
for this galaxy). For its mass, morphology, metal abundance and bright ULX
population, NGC 1232A is analogous to the more nearby late-type spiral NGC
1313.
