Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.263..653k&link_type=abstract
Nature, vol. 263, Oct. 21, 1976, p. 653-656. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astronomy
46
Extragalactic Radio Sources, Faraday Effect, Intergalactic Media, Radio Astronomy, Cosmology, Galactic Rotation, Gas Density, Ionized Gases, Polarized Electromagnetic Radiation, Quasars, Radio Galaxies, Red Shift, Variance (Statistics)
Scientific paper
Causes of Faraday rotation in extragalactic radio sources have been reinvestigated in light of recent polarization data which extend to large redshifts. The results show convincingly that at nearly all galactic latitudes, the large rotation measures are generated outside the Milky Way. Furthermore, any contribution from the intergalactic medium must be small when compared with the Faraday rotation generated at or in the extragalactic sources themselves. Using rotation measures for 108 QSOs, of which 48 have redshifts greater than unity, the lowest and most reliable upper limits are placed on any contribution from an intergalactic magneto-ionic medium at early cosmological epochs. The data show promise that it should soon be possible to ascertain whether or not the density of intergalactic ionized gas follows the cosmological scale factor.
Kronberg Philipp P.
Simard-Normandin M.
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