Intrinsic Origin Of Extreme-Scale Rotation Of Quasar Polarization Vectors

Abstract

Extreme-scale alignment of quasar optical polarization vectors at cosmological scales ($z\le 2$) is also characterized by the rotation of mean position angle $\chi$ with $\Delta \chi \approx 30^{\circ }$ per 1 Gpc. For observing interval of $z$ the total rotation angle acquires the value $\sim 90^{\circ }$. We suggest the possible explanation of the half of this rotation as a consequence of physical transformation of initially vertical magnetic field ${\mathbf{B}}_{\Vert }$, directed along the normal $\mathbf{N}$ to the surface of accretion disk, into the horizontal (perpendicular to $\mathbf{N}$) one. We found asymptotical analytical expressions for axially averaged polarization degree $p$ and mean position angle $\chi$ for various types of magnetized accretion disks. We found also that during the evolution can be realized the case $B_{\perp }\approx B_{\Vert }$ where position angle $\chi$ rotates from $45^{\circ }$ to zero. This rotation may occur during fairly great cosmological time (corresponding to $\Delta z\sim 1-2$). The part of rotation $\sim \Delta \chi \approx 45^{\circ }$ can be explained by a mechanism of alignment of polarization vectors, say distribution of the part of quasars as a spiral in the cosmic space with slow variation of rotation axis of corresponding accretion disks. Both mechanisms are mutually related one with another.

7 pages

References in corpus (1)

• Photon-Axion-Like Particle Coupling Constant and Cosmological Observations

Cited by in corpus (1)

• Vacuum Electromagnetic Counterparts of Binary Black-Hole Mergers