scholarly journals A Study of the Decimetric Emission and Polarization of Centaurus A

1965 ◽  
Vol 18 (6) ◽  
pp. 590 ◽  
Author(s):  
BFC Cooper ◽  
RM Price ◽  
DJ Cole
Keyword(s):  
Wavelength Range ◽  
Faraday Rotation ◽  
Intrinsic Polarization ◽  
Centaurus A

The results of a study of Centaurus A in the wavelength range 6-74 cm are presented. From observations at 11, 21, and 31 cm the intrinsic polarization and Faraday rotation have been determined for much of the source.

scholarly journals Faraday Rotation Effects associated with the Radio Source Centaurus A

Nature ◽  
1962 ◽  
Vol 196 (4856) ◽  
pp. 761-761 ◽  
Author(s):  
B. F. C. COOPER ◽  
R. M. PRICE
Keyword(s):  
Radio Source ◽  
Faraday Rotation ◽  
Centaurus A

scholarly journals Emission Regions in Centaurus A

1982 ◽  
Vol 97 ◽  
pp. 115-116
Author(s):  
R. M. Price ◽  
J. A. Graham
Keyword(s):  
Radio Source ◽  
Faraday Rotation ◽  
Linear Polarization ◽  
Radio Galaxy ◽  
Radio Galaxies ◽  
Extragalactic Radio Source ◽  
Physical Mechanisms ◽  
Centaurus A

Centaurus A, at an estimated distance of five megaparsecs, is the closest radio galaxy. It presents the best opportunity to examine in detail the physical mechanisms and resulting structures that are to be found in radio galaxies. Centaurus was first studied in detail at radio wavelengths by Cooper, Price and Cole (1965), hence CPC. Many of the comments, interpretations, and conclusions recorded in that paper remain valid today and provide the broader framework in which the more detailed studies using today's more powerful instrumentation can be understood. Historically, it is also interesting to note that Centaurus A was the first extragalactic radio source in which linear polarization and Faraday rotation were discovered and extensively studied.

Faraday Rotation Effects associated with the Radio Source Centaurus A

Nature ◽  
1962 ◽  
Vol 195 (4846) ◽  
pp. 1084-1085 ◽  
Author(s):  
B. F. C. COOPER ◽  
R. M. PRICE
Keyword(s):  
Radio Source ◽  
Faraday Rotation ◽  
Centaurus A

scholarly journals FARADAY ROTATION STRUCTURE ON KILOPARSEC SCALES IN THE RADIO LOBES OF CENTAURUS A

2009 ◽  
Vol 707 (1) ◽  
pp. 114-125 ◽  
Author(s):  
I. J. Feain ◽  
R. D. Ekers ◽  
T. Murphy ◽  
B. M. Gaensler ◽  
J-P Macquart ◽  
...  
Keyword(s):  
Faraday Rotation ◽  
Centaurus A

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.

scholarly journals The Faraday rotation measure synthesis technique

2008 ◽  
Vol 4 (S259) ◽  
pp. 591-602 ◽  
Author(s):  
George Heald
Keyword(s):  
Faraday Rotation ◽  
Line Of Sight ◽  
Dispersion Function ◽  
The Novel ◽  
Radio Telescopes ◽  
Intrinsic Polarization ◽  
Discrete Frequency ◽  
Synthesis Technique ◽  
Rotation Measure ◽  
Frequency Sampling

AbstractWe discuss practical aspects of the novel Faraday Rotation Measure Synthesis technique, first described by Burn (1966), and recently extended and implemented by Brentjens & de Bruyn (2005). The method takes advantage of the excellent spectral coverage provided by modern radio telescopes to reconstruct the intrinsic polarization properties along a line of sight, using a Fourier relationship between the observed polarization products and a function describing the intrinsic polarization (the Faraday dispersion function). An important consequence of the Fourier relationship and discrete frequency sampling is the need, in some cases, to deconvolve the sampling response from the reconstructed Faraday dispersion function. Practical aspects of the deconvolution procedure are discussed. We illustrate the use of the technique by summarizing a recent investigation carried out with the WSRT. We conclude by briefly describing the applicability to future programs which will be carried out with the next generation of radio telescopes such as LOFAR.

scholarly journals The Extraordinary Linear Polarisation Structure of the Southern Centaurus A Lobe Revealed by ASKAP

Galaxies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 127 ◽  
Author(s):  
Craig Anderson ◽  
George Heald ◽  
Shane O’Sullivan ◽  
John Bunton ◽  
Ettore Carretti ◽  
...  
Keyword(s):  
Faraday Rotation ◽  
Angular Resolution ◽  
Square Kilometre Array ◽  
Angular Scale ◽  
Radio Lobe ◽  
Full Band ◽  
Linear Polarisation ◽  
Centaurus A

We present observations of linear polarisation in the southern radio lobe of Centaurus A, conducted during commissioning of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. We used 16 antennas to observe a 30 square degree region in a single 12-h pointing over a 240 MHz band centred on 913 MHz. Our observations achieve an angular resolution of 26 × 33 arcseconds (480 parsecs), a maximum recoverable angular scale of 30 arcminutes, and a full-band sensitivity of 85 μ Jy beam − 1 . The resulting maps of polarisation and Faraday rotation are amongst the most detailed ever made for radio lobes, with order 10 5 resolution elements covering the source. We describe several as-yet unreported observational features of the lobe, including its detailed peak Faraday depth structure, and intricate networks of depolarised filaments. These results demonstrate the exciting capabilities of ASKAP for widefield radio polarimetry.

scholarly journals Faraday Rotation Effects associated with the Radio Source Centaurus A

Nature ◽  
1962 ◽  
Vol 196 (4856) ◽  
pp. 760-760 ◽  
Author(s):  
D. W. SCIAMA
Keyword(s):  
Radio Source ◽  
Faraday Rotation ◽  
Centaurus A

NEAR IR FARADAY ROTATION ON YIG DOPED WITH TETRAVALENT AND PENTAVALENT ELEMENTS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-969-C8-970 ◽  
Author(s):  
F. D'Orazio ◽  
F. Giammaria ◽  
F. Lucari ◽  
G. Parone
Keyword(s):  
Faraday Rotation ◽  
Near Ir
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