An electron temperature distribution derived from optical and radio measurements of HII regions |
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Authors: | Victor Mansfield |
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Institution: | (1) Center for Radio Physics and Space Research, Cornell University, Ithaca, N.Y., U.S.A. |
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Abstract: | Radio measurements of the electron temperature ofHii regions are obtained from the ratio of the brightness temperature of a hydrogen recombination line to that of the adjacent continuum, while optical measurements are obtained from the ratio of Oiii] forbidden-line intensities. The radio and optical measurements made under the assumption of an isothermalHii region,T
R andT
opt respectively, are combined to derive a temperature distribution for an entire nebula. A sphericalHii region in local thermodynamic equilibrium with constant density which is optically thin in both the line and the continuum is used as a model. Assuming linear temperature gradients withT
R=6000K andT
opt=10000K, it is found thatT=12000K (1–0.74r/R), wherer is the distance from the center andR is the radius of the nebula. |
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Keywords: | |
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