We have mapped the neutral gas content of the surroundings of three galaxies on the outskirts of the Local Group – Wolf–Lundmark–Melotte (WLM), NGC 1313 and Sextans A – at high velocity resolution and brightness sensitivity. We present high-quality H i spectra and parameters for the target galaxies, and find no unknown companion H i clouds nearer than ∼100 kpc to the targets, despite reaching a sensitivity of ∼106 M⊙ for narrow-linewidth objects.
Monthly Notices of the Royal Astronomical Society,
Vol. 351, no. 1 (Jun 2004), pp. 333-338