scholarly journals Probing the Large Faraday Rotation Measure Environment of Compact Active Galactic Nuclei

Galaxies ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 40
Author(s):  
Alice Pasetto ◽  
Carlos Carrasco-González ◽  
Shane O’Sullivan ◽  
Aritra Basu ◽  
Gabriele Bruni ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei ◽  
Rotation Measure

Distribution of Faraday Rotation Measure in Jets from Active Galactic Nuclei. I. Predictions from our Sweeping Magnetic Twist Model

2004 ◽  
Vol 600 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Yutaka Uchida ◽  
Hiromitsu Kigure ◽  
Shigenobu Hirose ◽  
Masanori Nakamura ◽  
Robert Cameron
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei ◽  
Rotation Measure

scholarly journals Parsec scale Faraday-rotation structure across the jets of nine active galactic nuclei

2017 ◽  
Vol 472 (2) ◽  
pp. 1792-1801 ◽  
Author(s):  
D. C. Gabuzda ◽  
N. Roche ◽  
A. Kirwan ◽  
S. Knuettel ◽  
M. Nagle ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei

scholarly journals MOJAVE: MONITORING OF JETS IN ACTIVE GALACTIC NUCLEI WITH VLBA EXPERIMENTS. VIII. FARADAY ROTATION IN PARSEC-SCALE AGN JETS

2012 ◽  
Vol 144 (4) ◽  
pp. 105 ◽  
Author(s):  
Talvikki Hovatta ◽  
Matthew L. Lister ◽  
Margo F. Aller ◽  
Hugh D. Aller ◽  
Daniel C. Homan ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei

scholarly journals Connecting magnetic towers with Faraday rotation gradients in active galactic nuclei jets

2013 ◽  
Vol 431 (1) ◽  
pp. 695-709 ◽  
Author(s):  
M. Mahmud ◽  
C. P. Coughlan ◽  
E. Murphy ◽  
D. C. Gabuzda ◽  
D. R. Hallahan
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei ◽  
Active Galactic Nuclei Jets

scholarly journals HELICAL MAGNETIC FIELDS IN RELATIVISTIC JETS THROUGH FARADAY ROTATION AND JET STRATIFICATION STUDIES

2012 ◽  
Vol 08 ◽  
pp. 265-270
Author(s):  
JOSÉ L. GÓMEZ ◽  
CAROLINA CASADIO ◽  
MAR ROCA-SOGORB ◽  
IVÁN AGUDO ◽  
ALAN P. MARSCHER ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Faraday Rotation ◽  
Galactic Nuclei ◽  
Relativistic Jets ◽  
Long Baseline ◽  
Rotation Measure ◽  
Very Long Baseline Array ◽  
Helical Magnetic Field ◽  
3C 120 ◽  
Emission Stratification

Helical magnetic fields may play an important role in the formation, collimation, and acceleration of relativistic jets in active galactic nuclei. These may be searched for by looking for Faraday rotation measure (RM) gradients and emission stratification across the jet width. Multi-epoch polarimetric Very Long Baseline Array (VLBA) observations of the radio galaxy 3C 120 have revealed the existence of such a RM gradient across the jet, but the presence of a localized region of enhanced RM and uncorrelated changes in the polarization of the underlying jet emission and the Faraday rotation screen suggest that a significant fraction of the RM found in 3C 120 originates in foreground clouds. Thanks to the combination of 48 images spanning 14 years of 15 GHz VLBA observations of 3C 273 we have found a stratification in total intensity across the jet that flips sides with distance along the jet, supporting a model in which the jet of 3C 273 accelerates and is threaded by a helical magnetic field.

A FRAMEWORK FOR INTERPRETING OBSERVED PHENOMENA ASSOCIATED WITH RELATIVISTIC OUTFLOWS IN AGN

2008 ◽  
Vol 17 (09) ◽  
pp. 1521-1530 ◽  
Author(s):  
D. C. GABUZDA
Keyword(s):  
Active Galactic Nuclei ◽  
Circular Polarization ◽  
Faraday Rotation ◽  
Surrounding Medium ◽  
Galactic Nuclei ◽  
High Energy ◽  
Electromagnetic Current ◽  
Relativistic Jets ◽  
Relativistic Shocks ◽  
Abundant Evidence

A growing number of jets in active galactic nuclei (AGN) show clear signs of helical magnetic (B) fields: Faraday-rotation gradients across the VLBI jets, extended regions of jet with orthogonal B fields, transverse polarization and total-intensity structures characteristic of helical fields, interknot polarization implying underlying orthogonal B fields, and a predominance of orthogonal B fields in the VLBI cores. In addition, a link has now been found between the circular polarization detected in AGN cores and the presence of helical jet B fields within these cores. This now abundant evidence compels us to take very seriously the idea that many, possibly all, AGN jets have helical B fields. As a whole, the recent observational results considered here suggest that we must look at AGN jets as fundamentally electromagnetic, current-carrying structures if we wish to fully understand their nature. This provides an overall framework for interpreting various observed phenomena associated with the relativistic jets of AGN, including high-energy phenomena. Superposed on the structure of the underlying helical B field may be the effects of relativistic shocks and interaction with the surrounding medium in some cases; these may dominate observed phenomena locally, while it is the "intrinsic" helical B field of the jet itself that determines the global observed characteristics of the jet.

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