HI Observations of the Local Group Dwarf WLM

Details HI Observations of the Local Group Dwarf WLM HI Observations of the Local Group Dwarf WLM

2004-07-06

arxiv.org/abs/astro-ph/0407116v1

Astronomy and Astrophysics

Astrophysics

23 pages, 8 jpg figures, Scheduled to appear in AJ, September, 2004. Full version at http://www.astro.umn.edu/~djackson/

Scientific paper

10.1086/423292

We present Australia Telescope Compact Array mosaic HI imaging of the Local Group dwarf irregular galaxy WLM. We find an integrated flux of 149 Jy km/s and a total HI mass of 3.2 x 10^7 solar masses. The major axis of the HI is aligned with the stellar component of the galaxy. The overall HI 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 HI peak is in close proximity to the brightest HII 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 x 10^8 solar masses. We also performed a wide field search, 38 arcminutes in radius, for HI companions or evidence of recent interactions (e.g., tidal tails), and found no detections to an HI mass limit of M_HI > 8.4 x 10^5 solar masses.

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