HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
Abstract
We report the discovery, from the HI Parkes All-Sky Survey (HIPASS), of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~10^9 M_sun of HI, 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 with its stream-like 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 which 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.
Cite
@article{arxiv.astro-ph/0103099,
title = {HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group},
author = {S. D. Ryder and B. Koribalski and L. Staveley-Smith and V. Kilborn and D. Malin and G. Banks and D. Barnes and R. Bhatal and W. de Blok and P. Boyce and M. Disney and M. Drinkwater and R. Ekers and K. Freeman and B. Gibson and P. Henning and H. Jerjen and P. Knezek and M. Marquarding and R. Minchin and J. Mould and T. Oosterloo and R. Price and M. Putman and E. Sadler and I. Stewart and F. Stootman and R. Webster and A. Wright},
journal= {arXiv preprint arXiv:astro-ph/0103099},
year = {2009}
}
Comments
8 pages, 4 figures, uses "emulateapj5.sty". Accepted for publication in ApJ, Vol. 555, 1 July 2001. Figs 1 and 2 included as JPEG