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Observations of Planetary Nebulae at Radio Wavelengths

Published online by Cambridge University Press:  14 August 2015

Yervant Terzian
Yervant Terzian*
Affiliation:
Arecibo Ionospheric Observatory*, Cornell University, Ithaca, N.Y., U.S.A.

Extract

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Planetary nebulae are weak radio sources. The radio emission of planetary nebulae is primarily due to free-free transitions in the ionized hydrogen cloud. Very large radio telescopes and sensitive receivers are needed to detect the weak radio emission of planetary nebulae. During the last 3 years about 80 planetary nebulae have been detected at some one radio frequency, and more than 60% of these have been detected at more than one frequency. Most of the measurements have been made to measure the flux densities of the nebulae and determine their radio spectra. A few interferometric observations have also been made to determine the radio widths of planetary nebulae. In some cases the radio observations have been used to determine the electron temperatures and emission measures of planetary nebulae, and also to derive the interstellar extinction at Hβ.

Type
Session II – Observations
Information
Symposium - International Astronomical Union , Volume 34: Planetary Nebulae , 1968 , pp. 87 - 103
Copyright
Copyright © Reidel 1968 

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