Dale C. Jackson et al. 2004 The Astronomical Journal 128 1219 doi:10.1086/423292
H I Observations of the Local Group Dwarf WLM
FREE ISSUEDale C. Jackson1, Evan D. Skillman1, John M. Cannon1,3 and Stéphanie Côté2
Show affiliationsWe present Australia Telescope Compact Array mosaic H I imaging of the Local Group dwarf irregular galaxy WLM. We find an integrated flux of 149 Jy km s-1 and a total H I mass of (3.2 ± 0.3) × 107 M
. The major axis of the H I is aligned with the stellar component of the galaxy. The overall H I distribution is relatively smooth at our resolution and has a double-peaked central core. One of these peaks is aligned with a region found to have extinction that is internal to WLM, and we take this as possible evidence of a large molecular gas complex in the southern half of the galaxy. The other H I peak is in close proximity to the brightest H II regions. WLM's overall velocity field is consistent with rigid-body rotation. A rotation curve is derived, and we find a total dynamical mass of (3.00 ± 0.80) × 108 M. We also performed a wide-field search, 38' in radius, for H I companions or evidence of recent interactions (e.g., tidal tails) and found no detections to an H I mass limit of MH I > 8.4 × 105 M.
- Keywords
galaxies: dwarf; galaxies: individual (WLM); galaxies: irregular; Local Group
- Dates
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Issue 3 (2004 September)
Received 2004 April 12, accepted for publication 2004 June 10
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H I Observations of the Local Group Dwarf WLM
Dale C. Jackson et al. 2004 The Astronomical Journal 128 1219
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