Reference : Large-Scale Alignments of Quasar Polarization Vectors: Evidence at Cosmological Scales f...
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/80893
Large-Scale Alignments of Quasar Polarization Vectors: Evidence at Cosmological Scales for Very Light Pseudoscalar Particles Mixing with Photons ?
English
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
Payez, Alexandre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules]
Cabanac, R [> > > >]
Lamy, Hervé [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)]
Sluse, D [> > > >]
Borguet, Benoît mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Cudell, Jean-René mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des astroparticules]
1-Nov-2011
Astronomical Polarimetry 2008: Science from Small to Large Telescopes. ASPC 449
Bastien, Pierre
ASP Conference Series, Astronomical Society of the Pacific, 2012., Vol. 449, p.441
441-445
No
International
Astronomical Polarimetry 2008: Science from Small to Large Telescopes
6-11 July 2008
Quebec
Canada
[en] Astrophysics ; High Energy Physics - Phenomenology
[en] Based on a sample of 355 quasars with significant optical polarization, we found that quasar polarization vectors are not randomly oriented over the sky as naturally expected. The probability that the observed distribution of polarization angles is due to chance is lower than 0.1%. The polarization vectors of the light from quasars are aligned although the sources span huge regions of the sky (˜ 1 Gpc). Groups of quasars located along similar lines of sight but at different redshifts (typically z ≍ 0.5 and z ≍ 1.5) are characterized by different preferred directions of polarization. These characteristics make the observed alignment effect difficult to explain in terms of a local contamination by interstellar polarization in our Galaxy. Interpreted in terms of a cosmological-size effect, we show that the dichroism and birefringence predicted by a mixing between photons and very light pseudoscalar particles within a magnetic field can qualitatively reproduce the observations. We find that circular polarization measurements could help constrain this mechanism.
Researchers
http://hdl.handle.net/2268/80893
http://adsabs.harvard.edu/abs/2011ASPC..449..441H
http://arxiv.org/abs/0809.3088

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