Galactic H II Regions. I. Observations of Their Continuum Radiation at the Frequency 5 GHz

The continuum radiation of thirteen galactic radio sources was mapped at a wavelength X = 6 cm. The NRAO 140-foot telescope was used for this survey; the half-power beam widths are 6.45 (E plane) and 6.3 (H plane), the beam efficiency is 0 81 and the aperture efficiency is 0 525 at this wavelength. Most of the investigated sources are resolved into two or more components The peak temperatures and the half-power widths of these components are computed by fitting Gaussian curves through the measured cross-sections The flux densities of the bright emission centers and the integrated flux density of the total radio source (after separation from the unresolved background radiation) are given. The positions of the emission centers are given with an accuracy between *1' and +3' The observation of the hydrogen 1O9n recombination line of these sources allows an unambiguous identification of H ii regions as well as an estimate of their distances and electron temperatures. The measured flux densities, together with these latter parameters, yield the total mass of ionized hydrogen, the average electron densities, and the maximum emission measures for the bright emission centers of the investigated H ii regions.