A comparison of the Orion nebula's physical conditions measured in the radio and optical domains

Details A comparison of the Orion nebula's physical conditions measured in the radio and optical domains A comparison of the Orion nebula's physical conditions measured in the radio and optical domains

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..385c&link_type=abstract

Astronomy and Astrophysics, vol. 56, no. 3, Apr. 1977, p. 385-400. Research supported by the Science Research Council

Astronomy and Astrophysics

Astrophysics

29

Abundance, Interstellar Matter, Light Emission, Nebulae, Radiative Recombination, Radio Spectra, Astronomical Maps, H Alpha Line, H Beta Line, Helium, Line Shape, Spectral Resolution

Scientific paper

The core of M42 has been studied in the H-alpha and He I optical lines as well as in the H66-alpha and He 66-alpha radio lines. The results of this study show a large degree of internal consistency probably because the angular and spectral resolutions were nearly identical for the optical and radio experiments. In particular, effective-temperature values derived from the radio recombination lines under the LTE assumption agree remarkably well with the values derived from a width comparison of H-alpha and He I line profiles. On the basis of this and other recent studies, it is suggested that the bulk emission in the H50-alpha to H170-alpha recombination lines can be explained by a simple model of optically thin nebular gas largely homogeneous in temperature (9000-10,000 K) and density and hardly removed from LTE. This model contrasts with more complex models thar require radial variations in temperature and density and large departures from LTE.

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