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New Infrared Sources Associated with H II Regions

Published online by Cambridge University Press:  14 August 2015

C. G. Wynn-Williams ,
E. E. Becklin  and
G. Neugebauer
C. G. Wynn-Williams
Affiliation:
California Institute of Technology, Pasadena, Calif., U.S.A.
E. E. Becklin
Affiliation:
California Institute of Technology, Pasadena, Calif., U.S.A. and Hale Observatories, California Institute of Technology, and Carnegie Institution of Washington, D.C., U.S.A.
G. Neugebauer
Affiliation:
California Institute of Technology, Pasadena, Calif., U.S.A. and Hale Observatories, California Institute of Technology, and Carnegie Institution of Washington, D.C., U.S.A.

Abstract

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Photometry and mapping in the wavelength range 1.65–20 μ of the H II regions W3 and NGC 7538 have led to the discovery of a dozen new infrared emission sources. The sources have flux densities ranging up to 10–23 Wm–2 Hz–1 at 20 μ and diameters from < 3 to 40″. Some are associated with, and have similar brightness distributions to compact H II condensations observed at radio wavelengths; they have, however, 20-μ flux densities much greater than, and 2-μ flux densities much less than are predicted from the radio free-free spectra. It is concluded that in many cases there exist close spatial relationships between the hot dust and the ionized gas, and between infrared and OH/H2O emission sources.

Type
Part VIII Dust and H II Regions
Information
Symposium - International Astronomical Union , Volume 52: Interstellar Dust and Related Topics , 1973 , pp. 459 - 463
Copyright
Copyright © Reidel 1973 

References

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