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33. Hydrogen emission nebulae as radio sources

Published online by Cambridge University Press:  14 August 2015

F. T. Haddock
F. T. Haddock*
Affiliation:
Naval Research Laboratory, Washington, D.C., U.S.A.*

Extract

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This talk is based largely upon the centimetre-wave observations of hydrogen emission nebulae made with the Naval Research Laboratory 50-ft. paraboloidal reflector at 3·15 cm. [1], at 9·4 cm. [2], and at 21 cm. [3]. After the detection of the first individual bright galactic nebulae at 9·4 cm. a systematic search was made to detect other hydrogen emission nebulae, principally with the aid of the catalogue of emission nebulae obtained by Sharpless [4] from 48-inch Schmidt plates at Mount Wilson and Palomar Observatories. An interesting correlation between radio detectability and nebular classification by optical size and brightness was found, in spite of the fact that optical extinction was not taken into account. The Sharpless catalogue lists 140 classified emission nebulae, of which sixty-five of the brightest were scanned with the radio antenna beam. Of these, twelve nebulae were detected and measured. They can be grouped as follows.

Type
Part II: Point Sources: Individual Study and Physical Theory
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 192 - 196
Copyright
Copyright © Cambridge University Press 1957 

References

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