Large-scale far-infrared mapping of the S 235 molecular cloud

In the present 70 and 130 micron maps of the entire S 235 molecular cloud, the dust temperature is higher than the gas kinetic temperature at every position. This is a necessary condition for the gas to be heated through collisions with hot dust grains, and although known embedded sources can mainta...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1984-02, Vol.131 (2), p.221-228
Main Authors: NORDH, H. L, VAN DUINEN, R. J, FRIDLUND, C. V. M, SARGENT, A. I, AALDERS, J. W. G, BEINTEMA, D
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Interstellar medium (ism) and nebulae in milky way
Molecular clouds, h2 clouds, dense clouds, and dark clouds
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary:In the present 70 and 130 micron maps of the entire S 235 molecular cloud, the dust temperature is higher than the gas kinetic temperature at every position. This is a necessary condition for the gas to be heated through collisions with hot dust grains, and although known embedded sources can maintain most of the required heating, the surface distribution of the dust temperature indicates that additional heat sources which are heavily obscured may exist. Only graphite is likely to be heated to the observed temperatures by known embedded stars. By combining far-IR and molecular data, it is proposed that the cloud density structure is inhomogeneous, with high density clumps immersed in a medium with lower density.
ISSN:0004-6361
1432-0746