H1666-ALPHA Line Emission in Southern HII Regions

The extensive H166α line, several points in each region, and 1.4 GHz continuum observations from nineteen HII regions were carried out with the 30-m antenna of the Instituto Argentino de Radioastronomía. Physical parameters of the low-density ionized gas associated to the sources, were obtained from these observations. From these results, and those of the northern and southern H166α surveys (Hart and Pedlar, 1976b; Lockman, 1976; Cersosimoet al., 1989), we can assume that the physical conditions of the low-density ionized gas, seen both in direction to and away from discrete sources, are similar.