High-sensitivity AGN polarimetry at sub-millimeter wavelengths
Journal article, 2017

The innermost regions of radio loud Active Galactic Nuclei (AGN) jets are heavily affected by synchrotron self-absorption, due to the strong magnetic fields and high particle densities in these extreme zones. The only way to overcome this absorption is to observe at sub-millimeter wavelengths, although polarimetric observations at such frequencies have so far been limited by sensitivity and calibration accuracy. However, new generation instruments such as the Atacama Large mm/sub-mm Array (ALMA) overcome these limitations and are starting to deliver revolutionary results in the observational studies of AGN polarimetry. Here we present an overview of our state-of-the-art interferometric mm/sub-mm polarization observations of AGN jets with ALMA (in particular, the gravitationally-lensed sources PKS 1830-211 and B0218+359), which allow us to probe the magneto-ionic conditions at the regions closest to the central black holes.


Graviational lenses

PKS 1830-211

Active galactic nuclei




Ivan Marti-Vidal

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Sebastien Muller

Chalmers, Earth and Space Sciences, Onsala Space Observatory


20754434 (eISSN)

Vol. 5 4 65

Subject Categories

Astronomy, Astrophysics and Cosmology



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