HI in HII-Galaxies and Their Companions
HII galaxies are dwarf galaxies which are currently actively forming stars. We speculated that an interaction with an optically faint, but gas-rich object might be responsible for their enhanced star formation. This prompted us to search for companions with the VLA in the 21-cm line of HI. This has several advantages over optical searches (Campos-Aguilar et al. 1991, AJ, 106, 1784; Telles & Terlevich 1995, MNRAS, 275, 1), e.g., the direct availability of redshifts.