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The distribution of neutral hydrogen in the orion region

Published online by Cambridge University Press:  14 August 2015

H. Van Woerden
H. Van Woerden*
Affiliation:
Kapteyn Astronomical Laboratory, Groningen, The Netherlands

Extract

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Neutral hydrogen is the main constituent of interstellar material. While solid particles and ionized hydrogen have long been studied, detailed investigations of the distribution of neutral hydrogen have only recently become possible. The first survey of neutral hydrogen in Orion was made by Menon [1, 2] with the Harvard 24–foot telescope and reported at Jodrell Bank in 1955. A more detailed study of the structure and dynamics of the interstellar medium in this region is now in progress with the 25–meter reflector at Dwingeloo. Its beamwidth is 0°.57 at 21 cm, corresponding to 5 parsecs at the distance of the Orion association. The bandwidth of the receiver was 20 kc/s, or 4 km/second, in this program. Observations with 10 kc/s bandwidth are being added.

Type
Part III: Galactic and Extragalactic Radio Sources
Information
Symposium - International Astronomical Union , Volume 9: Paris Symposium on Radio Astronomy , 1959 , pp. 370 - 373
Copyright
Copyright © Stanford University Press 1959 

References

1. Menon, T. K. Radio Astronomy (I.A.U. Symposium No. 4, 1955). Cambridge, England, 1957, p. 56.Google Scholar
2. Menon, T. K. Ap. J. 127, 28, 1958.Google Scholar
3. Lilley, A. E. Ap. J. 121, 559, 1955.Google Scholar
4. Bok, B. J., Lawrence, R. S., and Menon, T. K. P.A.S.P. 67, 108, 1955.Google Scholar
5. van de Hulst, H. C., Muller, C. A., and Oort, J. H. B.A.N. 12, 117, 1954 (see page 130).Google Scholar