A complete 3D numerical study of the effects of pseudoscalar–photon mixing on quasar polarizations

Agarwal, Nishant; Aluri, Pavan K.; Jain, Pankaj; Khanna, Udit; Tiwari, Prabhakar

doi:10.1140/epjc/s10052-012-1928-y

Cited by 24 publications

(20 citation statements)

References 91 publications

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“…For example, it might acquire correlations over larger distance due to mixing with pseudoscalar particles in background magnetic field. 37,38 This phenomenon does not significantly affect radio polarizations. 39 Hence despite the observed difference in the scale of alignment, it is possible that intergalactic magnetic field might explain both observations.…”

Section: Physical Explanationmentioning

confidence: 90%

Polarization Alignment in Jvas/Class Flat Spectrum Radio Surveys

Tiwari

Jain

2013

Int. J. Mod. Phys. D

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We present a detailed statistical analysis of the alignment of polarizations of radio sources at high redshift. This study is motivated by the puzzling signal of alignment of polarizations from distant quasars at optical frequencies. We use a coordinate invariant measure of dispersion to test for alignment of polarizations of widely separated sources. The data from JVAS/CLASS 8.4 GHz surveys are used for our study. We find that the data set with polarization flux greater than 1 mJy shows a significant signal of alignment at distance scales of order 150 Mpc. The significance of alignment decreases as we go to larger distances. In contrast the data set with polarization flux less than 1 mJy does not show significant alignment at short distances. However this set, as well as the full data sample, shows a very significant signal at large distances of order 500-850 Mpc. Due to the presence of relatively large error in the low polarization sample, this signal needs to be tested further with more refined data. We also study the signal by imposing a cut on the error in polarization. We find that the significance of alignment increases with decrease in fractional error. We are unable to attribute our results to known sources of bias. We discuss a possible physical explanation of our results. Int. J. Mod. Phys. D 2013.22. Downloaded from www.worldscientific.com by CAMBRIDGE UNIVERSITY on 02/07/15. For personal use only. 1350089-3 Int. J. Mod. Phys. D 2013.22. Downloaded from www.worldscientific.com by CAMBRIDGE UNIVERSITY on 02/07/15. For personal use only.

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Section: Physical Explanationmentioning

confidence: 90%

Polarization Alignment in Jvas/Class Flat Spectrum Radio Surveys

Tiwari

Jain

2013

Int. J. Mod. Phys. D

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“…We numerically generate intergalactic magnetic field in 3D space using the procedure described in Agarwal et al (2012) for different values of the spectral index n B . We consider discretized space consisting of a large number of cells or domains of equal size.…”

Section: Correlations In Inter-galactic Magnetic Fieldmentioning

confidence: 99%

Extracting the spectral index of the intergalactic magnetic field from radio polarizations

Tiwari

Jain

2016

Mon. Not. R. Astron. Soc.

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We explain the large scale correlations in radio polarization in terms of the correlations of galaxy cluster/supercluster magnetic field. Assuming that the polarization correlations closely follow the spatial correlations of the background magnetic field we recover the magnetic field spectral index as −2.74 ± 0.04. This remarkably agrees with cluster magnetic field spectral index obtained in cosmological magneto-hydrodynamic simulations. We discuss possible physical scenarios in which the observed polarization alignment is plausible.

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“…Possible effects modifying the polarization of light along the line of sight, in particular mixing with axion-like particles, have been investigated in detail (e.g., Das et al 2005;Agarwal et al 2012). However, because of the absence of comparable circular polarization, these mechanisms have been essentially ruled out (Hutsemékers et al 2010;Payez et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…, hereafter Papers I, II, III) have reported alignments of quasar optical linear polarizations extending over Gpc-scale regions of the sky at redshift z ∼ 1 (see also Jain et al 2004, Shurtleff 2013, Pelgrims and Cudell 2014. Possible effects modifying the polarization of light along the line of sight, in particular mixing with axion-like particles, have been investigated in details (e.g., Das et al 2005, Agarwal et al 2012. However, due to the absence of comparable circular polarization, these mechanisms have been essentially ruled out (Hutsemékers et al 2010, Payez et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Alignment of quasar polarizations with large-scale structures

Hutsemékers

Braibant

Pelgrims

et al. 2014

A&A

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We have measured the optical linear polarization of quasars belonging to Gpc scale quasar groups at redshift z ∼ 1.3. Out of 93 quasars observed, 19 are significantly polarized. We found that quasar polarization vectors are either parallel or perpendicular to the directions of the large-scale structures to which they belong. Statistical tests indicate that the probability that this effect can be attributed to randomly oriented polarization vectors is on the order of 1%. We also found that quasars with polarization perpendicular to the host structure preferentially have large emission line widths while objects with polarization parallel to the host structure preferentially have small emission line widths. Considering that quasar polarization is usually either parallel or perpendicular to the accretion disk axis depending on the inclination with respect to the line of sight, and that broader emission lines originate from quasars seen at higher inclinations, we conclude that quasar spin axes are likely parallel to their host large-scale structures.

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A complete 3D numerical study of the effects of pseudoscalar–photon mixing on quasar polarizations

Cited by 24 publications

References 91 publications

Polarization Alignment in Jvas/Class Flat Spectrum Radio Surveys

Polarization Alignment in Jvas/Class Flat Spectrum Radio Surveys

Extracting the spectral index of the intergalactic magnetic field from radio polarizations

Alignment of quasar polarizations with large-scale structures

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