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High-Sensitivity AGN Polarimetry at Sub-Millimeter Wavelengths

Onsala Space Observatory, Department of Space Earth and Environment, Chalmers University of Technology, 41258 Gothenburg, Sweden
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Academic Editors: Emmanouil Angelakis, Markus Boettcher and Jose L. Gómez
Galaxies 2017, 5(4), 65; https://doi.org/10.3390/galaxies5040065
Received: 31 August 2017 / Revised: 17 September 2017 / Accepted: 25 September 2017 / Published: 15 October 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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. View Full-Text
Keywords: Active galactic nuclei; Graviational lenses; Polarization; Interferometry; PKS 1830-211; B0218+359 Active galactic nuclei; Graviational lenses; Polarization; Interferometry; PKS 1830-211; B0218+359
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Martí-Vidal, I.; Muller, S. High-Sensitivity AGN Polarimetry at Sub-Millimeter Wavelengths. Galaxies 2017, 5, 65.

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