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Galaxies 2017, 5(4), 97; https://doi.org/10.3390/galaxies5040097

Magnetic Field Studies in BL Lacertae through Faraday Rotation and a Novel Astrometric Technique

1
Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain
2
International Centre for Radio Astronomy Research, M468, The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia
3
CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington Western Australia 6151, Australia
4
Observatorio Astronómico Nacional (IGN), Alfonso XII, 3 y 5, E-28014 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 25 September 2017 / Revised: 5 December 2017 / Accepted: 5 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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Abstract

It is thought that dynamically important helical magnetic fields twisted by the differential rotation of the black hole’s accretion disk or ergosphere play an important role in the launching, acceleration, and collimation of active galactic nuclei (AGN) jets. We present multi-frequency astrometric and polarimetric Very Long Baseline Array (VLBA) images at 15, 22, and 43 GHz, as well as Faraday rotation analyses of the jet in BL Lacertae as part of a sample of AGN jets aimed to probe the magnetic field structure at the innermost scales to test jet formation models. The novel astrometric technique applied allows us to obtain the absolute position at mm wavelengths without any external calibrator. View Full-Text
Keywords: galaxies: active; galaxies: individual (BL Lacertae); astrometry; galaxies: jets; polarization galaxies: active; galaxies: individual (BL Lacertae); astrometry; galaxies: jets; polarization
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Molina, S.N.; Gómez, J.L.; Dodson, R.; Rioja, M.J. Magnetic Field Studies in BL Lacertae through Faraday Rotation and a Novel Astrometric Technique. Galaxies 2017, 5, 97.

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