scholarly journals Transverse Faraday-rotation gradients across the jets of 15 active galactic nuclei

2015 ◽  
Vol 450 (3) ◽  
pp. 2441-2450 ◽  
Author(s):  
D. C. Gabuzda ◽  
S. Knuettel ◽  
B. Reardon
Keyword(s):  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Galactic Nuclei

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

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.

scholarly journals High-Frequency Polarization Variability from Active Galactic Nuclei

Galaxies ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 51
Author(s):  
Iván Martí-Vidal ◽  
Ciriaco Goddi
Keyword(s):  
Magnetic Fields ◽  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Thermal Emission ◽  
Critical Role ◽  
Galactic Nuclei ◽  
Magnetized Plasma ◽  
Polarization Angle ◽  
Intrinsic Polarization ◽  
Polarized Emission

The linear polarization of non-thermal emission encodes information about the structure of the magnetic fields, either from the region where the emission is produced (i.e., the intrinsic polarization angle) and/or from the screens of magnetized plasma that may be located on its way towards Earth (i.e., the effect of Faraday rotation). In addition, the variability timescale of the polarized emission, or its Faraday rotation, can be used to estimate the size of the region where the emission (or the Faraday rotation) originates. The observation of polarized emission from active galactic nuclei (AGN) and, in particular, its time evolution, also provides information about the critical role that magnetic fields may play in the process of jet launching and propagation. In this paper, we review some recent results about polarization variability from the cores of AGN jets, including observations at high spatial resolutions and/or at high radio frequencies.

ERRATUM: “MOJAVE: MONITORING OF JETS IN ACTIVE GALACTIC NUCLEI WITH VLBA EXPERIMENTS. VIII. FARADAY ROTATION IN PARSEC-SCALE AGN JETS” (2012, AJ, 144, 105)

2013 ◽  
Vol 145 (6) ◽  
pp. 172 ◽  
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 Two component relativistic acceleration and polarized radiation of the parsec-scale AGN jet

2010 ◽  
Vol 6 (S274) ◽  
pp. 258-262
Author(s):  
Oliver Porth
Keyword(s):  
High Resolution ◽  
Active Galactic Nuclei ◽  
Faraday Rotation ◽  
Radiation Transport ◽  
Current System ◽  
Galactic Nuclei ◽  
High Enthalpy ◽  
Two Component ◽  
Thermally Driven ◽  
Polarized Radiation

AbstractWe perform axisymmetric simulations of two-component jet acceleration using the special relativistic MHD code PLUTO (Mignone et al., 2007). The inner, thermally driven component constitutes a dilute relativistic plasma originating in a high enthalpy central corona. The second component is a Poynting-dominated wind driven by a global current system. Once a near-stationary state is reached, we solve the polarized Synchrotron radiation transport incorporating self-absorption and (internal) Faraday rotation. With this approach we obtain high-resolution radio maps and spectra that can help in the interpretation of observational data from nearby active galactic nuclei by predicting spine-sheath polarization structures and Faraday rotation gradients.

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
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