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Measurements of neutral hydrogen in galactic star clusters

Published online by Cambridge University Press:  14 August 2015

R. D. Davies  and
H. M. Tovmassian
R. D. Davies
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank
H. M. Tovmassian
Affiliation:
Byurakan Astrophysical Observatory

Extract

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A search was made for neutral hydrogen in the following galactic star clusters — the Pleiades, NGC 1502, the Trapezium-Orion cluster, NGC 2244, and NGC 6910 (Davies and Tovmassian 1963). Observations were made with a six-channel receiver having a 5 kc/s bandwidth; it was used with the 250-foot radio telescope which has a beamwidth of 12′ by 18′. The first stage of the receiver was a parametric amplifier with an excess temperature of 200°K. Simultaneous measurements with a 5 Mc/s bandwidth showed the existence of ionized hydrogen associated with the clusters.

Type
Section 1: The Galaxy
Information
Symposium - International Astronomical Union , Volume 20: The Galaxy and the Magellanic Clouds , 1964 , pp. 38 - 40
Copyright
Copyright © Australian Academy of Science 1964