• DOI:10.1086/321453
• Corpus ID: 14455875

HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group

@article{Ryder2001HIPASSDO,
  title={HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group},
  author={Stuart D. Ryder and B{\"a}rbel S. Koribalski and Lister Staveley-Smith and Virginia A. Kilborn and David F. Malin and G. D. Banks and David G. Barnes and R. Bhatal and W.J.G. de Blok and Peter J. Boyce and Michael John Disney and Michael J. Drinkwater and Ron D. Ekers and Kenneth C. Freeman and Brad K. Gibson and Patricia A. Henning and Helmut Jerjen and Patricia Knezek and Malte Marquarding and Robert. F. Minchin and Jeremy R. Mould and Thomas A. Oosterloo and Robert M. Price and Mary E. Putman and Elaine M. Sadler and Ian B. Stewart and Frank H. Stootman and Rachel L. Webster and Alan Edward Wright},
  journal={The Astrophysical Journal},
  year={2001},
  volume={555},
  pages={232 - 239}
}

• S. Ryder, B. Koribalski, +26 authors A. Wright
• Published 6 March 2001
• Physics
• The Astrophysical Journal

We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 M☉ of H I, or nearly one-third as much atomic gas as NGC 2442 itself. No optical counterpart to any part of HIPASS J0731-69 has yet been identified, consistent with the gas being diffuse and its streamlike kinematics. If the gas in HIPASS J0731-69 was once part of NGC 2442, then it was most likely a fairly recent tidal encounter with a moderately massive companion that tore it loose, although the possibility of ram-pressure stripping cannot be ruled out. This discovery highlights the potential of the HIPASS data for yielding new clues to the nature of some of the best-known galaxies in the local universe.