Comment on the Measurement of Cosmological Birefringence

Details Comment on the Measurement of Cosmological Birefringence Comment on the Measurement of Cosmological Birefringence

1997-04-29

arxiv.org/abs/astro-ph/9704285v2

Astronomy and Astrophysics

Astrophysics

Comment on astro-ph/9704196. 3 pages, RevTeX, 1 ps figure included. 1st page is comment submitted to PRL, revised in light of

Scientific paper

Nodland and Ralston (astro-ph/9704196) claim evidence for a wavelength-independent cosmic birefringence. Although it has been shown (astro-ph/9704247, astro-ph/9704263) that the data analysed did not support this conclusion, the possibility of such an effect remains interesting. Here I present a much more accurate test using high-resolution radio images of distant radio galaxies and quasars. A preliminary application sets an upper limit about thirty times lower than the original claim.

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