Abstract:
We present observations and models of the kinematics and the distribution of the
neutral hydrogen (Hi) in the isolated dwarf irregular galaxy, Wolf-Lundmark-Melotte
(WLM). We observed WLM with the Green Bank Telescope (GBT) and as part of
the MeerKAT Early Science Programme, where 16 dishes were available. The Hi disc
of WLM extends out to a major axis diameter of 300 (8.5 kpc), and a minor axis
diameter of 200 (5.6 kpc) as measured by the GBT. We use the MeerKAT data to
model WLM using the TiRiFiC software suite, allowing us to t di erent tilted-ring
models and select the one that best matches the observation. Our nal best- tting
model is a
at disc with a vertical thickness, a constant inclination and dispersion,
and a radially-varying surface brightness with harmonic distortions. To simulate bar-
like motions, we include second-order harmonic distortions in velocity in the tangential
and the vertical directions. We present a model with only circular motions included
and a model with non-circular motions. The latter describes the data better. Overall,
the models reproduce the global distribution and the kinematics of the gas, except for
some faint emission at the 2 level. We model the mass distribution of WLM with a
pseudo-isothermal (ISO) and a Navarro-Frenk-White (NFW) dark matter halo models.
The NFW and the ISO models t the derived rotation curves within the formal errors,
but with the ISO model giving better reduced chi-square values. The mass distribution
in WLM is dominated by dark matter at all radii.
