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- HIPASS detection of an intergalactic gas cloud in the NGC 2442 group
- Ryder, Stuart D.; Koribalski, Baerbel S.; Staveley-Smith, Lister; Kilborn, Virginia A.; Malin, David F.; Banks, Gareth D.; Barnes, David G.; Bhathal, Raghir; De Blok, Erwin; Boyce, Peter J.; Disney, Michael J.; Drinkwater, Michael J.; Ekers, Ron D.; Freeman, Ken C.; Gibson, Brad K.; Henning, Patricia A.; Jerjen, Helmut; Knezek, Patricia M.; Marquarding, Malte; Minchin, Robert F.; Mould, Jeremy R.; Oosterloo, Tom; Price, R. M.; Putman, Mary E.; Sadler, Elaine M.; Stewart, Ian M.; Stootman, Frank; Webster, Rachel L.; Wright, Alan E.
- 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 Msolar 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.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. School of Biophysical Science and Electrical Engineering. Centre for Astrophysics and Supercomputing
- Astrophysical journal, Vol. 555, no. 1 (2001), pp. 232-239
- Publication year
- University of Chicago Press
- Publisher URL
- Copyright © 2001 The American Astronomical Society. Reproduced in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed