Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ipesprept.....c&link_type=abstract
M.S. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).
Other
Astronomical Models, Electron Scattering, H Ii Regions, Orion Nebula, Radiative Transfer, Recombination Reactions, Electron Energy, Line Spectra, Radio Frequencies, Radio Telescopes, Thermodynamic Equilibrium
Scientific paper
The objective of this work is the determination of the physical condition of H2 regions through the modeling of hydrogen recombination line profiles in radio frequencies. The radiative transfer equation includes the effects of nonlocal thermodynamic equilibrium in the population of the energy levels and the influence of inelastic electron collisions in the line width (pressure broadening). The accuracy of the numerical integration is verified for the case of isothermal homogeneous spherical nebulae, for which an analytical solution of the radiative transfer equation is possible. Recombination lines from inhomogeneous H2 region models were compared with published models of other authors. The agreement between them was very good. These models were applied to the H66 alpha line in the Orion Nebula, observed with the Itapetinga radio telescope. The results of these models indicate that although the amount of stimulated emission was small, it had a powerful influence in the line profile, due to the fact that the medium is transparent at this frequency. Therefore, the electron temperature deduced with the assumption of local thermodynamic equilibrium can be very different from the real one.
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