Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt.........3z&link_type=abstract
Ph.D. Thesis Toronto Univ. (Ontario). Dept. of Astronomy.
Astronomy and Astrophysics
Astronomy
4
Polarized Electromagnetic Radiation, Radio Astronomy, Radio Galaxies, Faraday Effect, Galactic Radio Waves, Magnetohydrodynamics, Plasmas (Physics)
Scientific paper
Polarimetric radio observations were obtained, with both single-dish (MPIfR 100-m) and synthesis array (NRAO-VLA) telescopes. The MPIfR 100-m telescope was used to observe approximately 150 radio galaxies at 6.3 cm. The two main results of the integrated polarization analysis are: (1) for radio galaxies of low redshift, the high-powered sources tend to possess a lower degree of polarization than the low-powered sources; and (2) for radio galaxies at high redshifts, the degree of polarization is larger than that observed in low redshift sources of the same luminosity. Possible interpretations of these trends are presented. The NRAO-VLA was used to map 3C46, 3C55, 3C153, 3C219, 3C227, 3C234, 3C270, 3C272.1, 3C275.1, 3C324, and 3C402 at several L-band frequencies in order to generate high-resolution radio magnetic (RM) images. Additional data at C-band is presented for 3C46, 3C219, 3C234, and 3C272.1. The RM dispersions were small except in the case of 3C153 and 3C324. Both 3C270 and 3C272.1 show RM bands whose orientation correlates with the shape of the optical galaxy. A least-squares fit of model RM images to the observed RM images yielded magneto-ionic densities of ca 0.003 and approximately 0.009 microGauss per cu cm for the northern component of 3C402 and the eastern head of 3C234, respectively. Analysis of the 11 sources revealed that random orientations in the magnetic field structure were the dominant component of the Faraday rotation. Large-scale depolarization is attributed to either external rotation by a clumpy thermal plasma surrounding the source, or internal rotation with very small pathlengths.
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