Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-17T21:14:08.319Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Habing, H. J., Israel, F. P., and de Jong, T.: 1972, Astron. Astrophys. 17, 329.Google Scholar
Hardebeck, E.: 1971, Astrophys. J. 170, 281.Google Scholar
Hills, R., Janssen, M. A., Thornton, D. D., and Welch, W. J.: 1972, Astrophys. J. Letters 175, L59.CrossRefGoogle Scholar
Martin, A. H. M.: 1972, private communication. Google Scholar
Wynn-Williams, C. G.: 1971, Monthly Notices Roy. Astron. Soc. 151, 397.Google Scholar
Wynn-Williams, C. G., Becklin, E. E., and Neugebauer, G.: 1972, Monthly Notices Roy. Astron. Soc. 160, 1.Google Scholar
Wynn-Williams, C. G., Becklin, E. E., and Neugebauer, G.: 1974, Astrophys. J. (in press).Google Scholar