Mapping extreme-scale alignments of quasar polarization vectors

Free access article

Issue		A&A Volume 441, Number 3, October III 2005


Page(s)		915 - 930
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20053337

A&A 441, 915-930 (2005)
DOI: 10.1051/0004-6361:20053337

Mapping extreme-scale alignments of quasar polarization vectors

D. Hutsemékers¹, R. Cabanac², H. Lamy³ and D. Sluse¹

¹ Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, B5c, 4000 Liège, Belgium
e-mail: hutsemekers@astro.ulg.ac.be
² Canada France Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, Hawaii 96743, USA
³ BIRA-IASB, Avenue Circulaire 3, 1180 Bruxelles, Belgium

(Received 29 April 2005 / Accepted 27 June 2005)

Abstract
Based on a new sample of 355 quasars with significant optical polarization and using complementary statistical methods, we confirm that quasar polarization vectors are not randomly oriented over the sky with a probability often in excess of 99.9%. The polarization vectors appear coherently oriented or aligned over huge (~1 Gpc) regions of the sky located at both low ( $z \sim 0.5$ ) and high ( $z \sim 1.5$ ) redshifts and characterized by different preferred directions of the quasar polarization. In fact, there seems to exist a regular alternance along the line of sight of regions of randomly and aligned polarization vectors with a typical comoving length scale of 1.5 Gpc. Furthermore, the mean polarization angle $\bar{\theta}$ appears to rotate with redshift at the rate of ~30 $\degr$ per Gpc. The symmetry of the the $\bar{\theta} -z$ relation is mirror-like, the mean polarization angle rotating clockwise with increasing redshift in North Galactic hemisphere and counter-clockwise in the South Galactic one. These characteristics make the alignment effect difficult to explain in terms of local mechanisms, namely a contamination by interstellar polarization in our Galaxy. While interpretations like a global rotation of the Universe can potentially explain the effect, the properties we observe qualitatively correspond to the dichroism and birefringence predicted by photon-pseudoscalar oscillation within a magnetic field. Interestingly, the alignment effect seems to be prominent along an axis not far from preferred directions tentatively identified in the Cosmic Microwave Background maps. Although many questions and more particularly the interpretation of the effect remain open, alignments of quasar polarization vectors appear as a promising new way to probe the Universe and its dark components at extremely large scales.

Key words: quasars: general -- polarization -- large-scale structure of Universe -- dark matter -- cosmology: observations

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