Two Dimensional Velocity Fields of Low Surface Brightness Galaxies

¹ Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
² RSAA Mount Stromlo Observatory, Cotter Road, Weston Creek ACT 2611, Australia
³ Observatoire de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 4, France

Abstract

We present high resolution two dimensional velocity fields from integral field spectroscopy along with derived rotation curves for nine low surface brightness galaxies. This is a positive step forward in terms of both data quality and number of objects studied. We fit NFW and pseudo-isothermal halo models to the observations. We find that the pseudo-isothermal halo better represents the data in most cases than the NFW halo, as the resulting concentrations are lower than would be expected for ΛCDM.