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Open AccessFeature PaperArticle

On the Time Variable Rotation Measure in the Core Region of Markarian 421

1
Dipartimento di Fisica e Astronomia, Università di Bologna, via Gobetti 93/3, 40129 Bologna, Italy
2
INAF Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
3
Instituto de Astrofísica de Andalucía, IAA-CSIC, Apdo. 3004, 18080 Granada, Spain
4
Institute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 10617, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Emilio Elizalde
Galaxies 2017, 5(4), 57; https://doi.org/10.3390/galaxies5040057
Received: 6 September 2017 / Revised: 18 September 2017 / Accepted: 20 September 2017 / Published: 26 September 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
In this conference contribution, we discuss and interpret the time variable rotation measure (RM) detected in the core region of the TeV blazar Markarian 421 (Mrk 421). We monitored Mrk 421 during 2011 with one observing run per month at 15, 24, and 43 GHz with the American Very Long Baseline Array. We explore the possible connection between the RM and the accretion rate, and we investigate the Faraday screen properties and its location with respect to the jet emitting region. Among the various scenarios, the jet sheath is the most promising candidate for being the main source of Faraday rotation. We interpret the RM sign reversals observed during the one-year monitoring within the context of the magnetic tower models by invoking the presence of two nested helical magnetic fields in the relativistic jet with opposite helicities, originating through the Poynting–Robertson cosmic battery effect. The net observed RM values result from the relative contribution of both inner and outer helical fields. View Full-Text
Keywords: active galaxies: magnetic fields; galaxies: jets; BL Lacertae objects: individual: Mrk 421 active galaxies: magnetic fields; galaxies: jets; BL Lacertae objects: individual: Mrk 421
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MDPI and ACS Style

Lico, R.; Gómez, J.L.; Asada, K.; Fuentes, A. On the Time Variable Rotation Measure in the Core Region of Markarian 421. Galaxies 2017, 5, 57. https://doi.org/10.3390/galaxies5040057

AMA Style

Lico R, Gómez JL, Asada K, Fuentes A. On the Time Variable Rotation Measure in the Core Region of Markarian 421. Galaxies. 2017; 5(4):57. https://doi.org/10.3390/galaxies5040057

Chicago/Turabian Style

Lico, Rocco; Gómez, José L.; Asada, Keiichi; Fuentes, Antonio. 2017. "On the Time Variable Rotation Measure in the Core Region of Markarian 421" Galaxies 5, no. 4: 57. https://doi.org/10.3390/galaxies5040057

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