Journal article
H i Observations of the Local Group Dwarf WLM
The Astronomical journal, Vol.128(3), pp.1219-1227
09/2004
DOI: 10.1086/423292
Abstract
We 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⊙.
Details
- Title: Subtitle
- H i Observations of the Local Group Dwarf WLM
- Creators
- Dale C. Jackson - University of MinnesotaEvan D. Skillman - University of MinnesotaJohn M. Cannon - University of MinnesotaStéphanie Côté - Herzberg Institute of Astrophysics
- Resource Type
- Journal article
- Publication Details
- The Astronomical journal, Vol.128(3), pp.1219-1227
- DOI
- 10.1086/423292
- ISSN
- 0004-6256
- eISSN
- 1538-3881
- Language
- English
- Date published
- 09/2004
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627205402771