scholarly journals Planck-scale constraints on anisotropic Lorentz and CPT invariance violations from optical polarization measurements

2017 ◽  
Vol 95 (8) ◽  
Author(s):  
Fabian Kislat ◽  
Henric Krawczynski
Keyword(s):  
Planck Scale ◽  
Optical Polarization ◽  
Cpt Invariance ◽  
Polarization Measurements

scholarly journals New optical polarization measurements of quasi-stellar objects. The data

2005 ◽  
Vol 433 (2) ◽  
pp. 757-764 ◽  
Author(s):  
D. Sluse ◽  
D. Hutsemékers ◽  
H. Lamy ◽  
R. Cabanac ◽  
H. Quintana
Keyword(s):  
Optical Polarization ◽  
Stellar Objects ◽  
Polarization Measurements ◽  
Quasi Stellar Objects

Optical Polarization Measurements of Pulsar NP 0532

Nature ◽  
1969 ◽  
Vol 223 (5206) ◽  
pp. 576-578 ◽  
Author(s):  
W. J. COCKE ◽  
M. J. DISNEY ◽  
T. GEHRELS
Keyword(s):  
Optical Polarization ◽  
Polarization Measurements

scholarly journals Cosmological-scale coherent orientations of quasar optical polarization vectors in the Planck era

2019 ◽  
Vol 622 ◽  
pp. A145 ◽  
Author(s):  
V. Pelgrims
Keyword(s):  
Polarization Vector ◽  
Quality Criteria ◽  
Contamination Level ◽  
Optical Polarization ◽  
Polarization Data ◽  
High Quality ◽  
Polarization Signal ◽  
Cosmological Scale ◽  
Polarization Measurements ◽  
Sigma Level

Gigaparsec scale alignments of the quasar optical polarization vectors have been proven to be robust against a scenario of contamination by the Galactic interstellar medium (ISM). This claim has been established by means of optical polarization measurements of the starlight surrounding the lines of sight of the 355 quasars for which reliable optical polarization measurements are available. In this paper, we take advantage of the full-sky and high quality polarization data released by the Planck satellite to provide an independent, complementary, and up-to-date estimation of the contamination level of the quasar optical polarization data by the Galactic dust. Our analysis reveals signatures of Galactic dust contamination at the two sigma level for about 30 percent of the quasar optical polarization data sample. The remaining 70 percent of the lines of sight do not show Galactic dust contamination above the two sigma level, suggesting low to negligible contamination of the quasar optical polarization signal. We further found arguments suggesting that Galactic thermal dust cannot fully account for the reported quasar optical polarization alignments. Based on the measurements of the ratio of the polarized intensity of the dust in the submillimeter to the degree of linear polarization of the quasar in the optical, we provide a new and independent quality criteria to apply to the quasar optical polarization sample. We argue that, unless correction is applied, such a criterion should be imposed on the data for future investigations in the framework of the cosmological-scale correlations of quasar optical polarization vector orientations that still could compete with the isotropic principle of the cosmological paradigm.

scholarly journals Optical and VLBI Polarization Measurements of AGN

1994 ◽  
Vol 159 ◽  
pp. 469-469
Author(s):  
D. C. Gabuzda ◽  
M. L. Sitko
Keyword(s):  
Radio Emission ◽  
Optical Polarization ◽  
Direct Link ◽  
Polarization Data ◽  
Polarization Measurements ◽  
Bl Lac ◽  
Polarized Emission ◽  
The Relationship

One of the most promising approaches to unravelling the relationship between the optical and radio emission in AGN is to obtain nearly simultaneous optical and VLBI polarization data. We have obtained such data for five AGN (0735+178, OJ287, 1219+285, 3C 279, and BL Lac). These data suggest that there is a direct link between the optical and radio polarized emission, and that frequently the optical polarization of AGN is associated with the emergence of new VLBI components.

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