Circular Polarization in AGN
J.-P. Macquart
TL;DR
This paper reviews recent observational constraints on circular polarization in active galactic nuclei (AGN), emphasizing the importance of high-resolution imaging techniques like VLBI and scintillation imaging to understand their source structures.
Contribution
It highlights the variability of circular polarization in AGN and discusses how advanced imaging methods can provide new insights into their compact emission regions.
Findings
Circular polarization varies on short timescales in many AGN.
High-resolution VLBI and scintillation imaging are promising tools for studying AGN polarization.
Source structure on milliarcsecond and microarcsecond scales is key to understanding polarization origins.
Abstract
We discuss the constraints that recent observations place on circular polarization in AGN. In many sources the circular polarization is variable on short timescales, indicating that it originates in compact regions of the sources. The best prospects for gleaning further information about circular polarization are high resolution VLBI and scintillation `imaging' which probe source structure on milliarcsecond and microarcsecond scales respectively.
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Taxonomy
TopicsIonosphere and magnetosphere dynamics · Particle accelerators and beam dynamics · Particle Accelerators and Free-Electron Lasers