Hipass detection of an intergalactic gas cloud in the NGC 2442 group

S.D. Ryder, B. Koribalski, Lister Staveley-Smith, V.A. Kilborn, D.F. Malin, G.D. Banks, D.G. Barnes, R. Bhatal, W.J.G. De Blok, P.J. Boyce, M.J. Disney, M.J. Drinkwater, R.D. Ekers, K.C. Freeman, B.K. Gibson, P.A. Henning, H. Jerjen, P.M. Knezek, M. Marquarding, R.F. MinchinJ.R. Mould, T. Oosterloo, R.M. Price, M.E. Putman, E.M. Sadler, I. Stewart, F. Stootman, R.L. Webster, A.E. Wright

    Research output: Contribution to journalArticle

    45 Citations (Scopus)

    Abstract

    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 similar to 10(9) 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.
    Original languageEnglish
    Pages (from-to)232-239
    JournalThe Astrophysical Journal
    Volume555
    Issue number1
    DOIs
    Publication statusPublished - 2001

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