Synthesis of the Polarization Properties of Cygnus A at 8300 and 9600 Megahertz

Citation

Yip, Ka Bing Winson (1972) Synthesis of the Polarization Properties of Cygnus A at 8300 and 9600 Megahertz. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/GVT6-PD26. https://resolver.caltech.edu/CaltechETD:etd-08252008-075815

Abstract

Methods of polarized interferometry have been used in conjunction with the earth rotation aperture synthesis technique to study the polarized intensity distributions of Cygnus A at 8300 MHz and 9600 MHz. The total intensity distribution at 8300 MHz has also been obtained. Although the resolutions obtained in these observations are about 20", it is still quite insufficient to reveal the structures in the components for a detailed comparison with the theoretical model proposed by Mills and Sturrock. The general featere of the ram pressure confinement mechanism, however, is consistent with this observation. The polarized distributions yield a rather fast variation of large rotation measures across the east component. There is also a reversal of the longitudinal magnetic field in the direction of the west component. Correlations with the distribution of small hydrogen clouds deduced from HI absorption measurements have been discussed. There seems to be little depolarization across this source except in the bridge, and this is believed to be occurring outside of the emitting region. However, no detailed models can be worked out without further information about the conditions of the intervening medium.

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