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The dynamics of the Orion Nebula

I: Neutral condensations in anHii region

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Abstract

A model is constructed of a spherically symmetric self-gravitating condensation of neutral hydrogen immersed in anHii region. The structure of the condensation is represented by the isothermal gas sphere at a temperature of 100°K. Typical parameters of such a condensation compatible with the estimated ultra-violet radiation field in the central regions of the Orion Nebula are, mass ≈1M ⊙; radius ≈1016 cm; mean density ≈10−15 gm cm−3. The condensations are not static configurations but evolve because of mass loss by ionization from their surfaces. Perhaps 5% become gravitationally unstable and collapse. The remainder act as sources of ionized gas which flows into the surrounding nebula.

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Authors and Affiliations

  1. Dept. of Astronomy, University of Manchester, England

    J. E. Dyson

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  1. J. E. Dyson
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Dyson, J.E. The dynamics of the Orion Nebula. Astrophys Space Sci 1, 388–405 (1968). https://doi.org/10.1007/BF00656009

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  • DOI: https://doi.org/10.1007/BF00656009

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