Models of H II regions from recombination line observations

Astronomy and Astrophysics – Astrophysics

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Electron Density (Concentration), H Ii Regions, Ionized Gases, Local Thermodynamic Equilibrium, Microwave Spectra, Recombination Reactions, Gas Temperature, Lyman Spectra, Nebulae

Scientific paper

In order to study the ionized gas with low electron density, the H159-alpha and H200-beta radio recombination lines (nu = 1.62 GHz) at l = 30.5 deg and l = 31.0 deg in the galactic plane, observed with the NRAO 43-m radiotelescope, are analyzed. The profiles show the LTE alpha/beta intensity ratio for the more distant component of the profiles (VLSR = 100 km/s). To derive the electron density and temperature of the emitting gas a new interpretation of the radio recombination lines is made. We suppose that the emission originates in a superposition of ionized gas layers with different densities along the line of sight. The number of layers in the model is equal to the numbers of different order transitions observed. By solving an equations set, the contribution of different components can be calculated. The method is used to estimate the electron density and temperature of the gas. Eleven models of two non-LTE components are considered. The photon flux required to ionize the regions are calculated and the results are compared with previous observations obtained in the region at 3 cm. Our results suggest that the necessary photon flux to ionize the extended envelopes of the regions is at least one order of magnitude larger than that needed for ionizing the core of the regions.

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