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.

Einstein observations of the X-ray structure of Centaurus A - Evidence for the radio-lobe energy source

1979 ◽  
Vol 234 ◽  
pp. L39 ◽  
Author(s):  
E. J. Schreier ◽  
E. Feigelson ◽  
J. Delvaille ◽  
R. Giacconi ◽  
J. Grindlay ◽  
...  
Keyword(s):  
Energy Source ◽  
X Ray ◽  
Radio Lobe ◽  
Centaurus A

scholarly journals Science with the Murchison Widefield Array

2013 ◽  
Vol 30 ◽  
Author(s):  
Judd D. Bowman ◽  
Iver Cairns ◽  
David L. Kaplan ◽  
Tara Murphy ◽  
Divya Oberoi ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Early Universe ◽  
Western Australia ◽  
Space Weather ◽  
Time Domain ◽  
Angular Resolution ◽  
Low Frequency ◽  
Performance Properties ◽  
Square Kilometre Array ◽  
Murchison Widefield Array

AbstractSignificant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefield Array is the first telescope in the southern hemisphere designed specifically to explore the low-frequency astronomical sky between 80 and 300 MHz with arcminute angular resolution and high survey efficiency. The telescope will enable new advances along four key science themes, including searching for redshifted 21-cm emission from the EoR in the early Universe; Galactic and extragalactic all-sky southern hemisphere surveys; time-domain astrophysics; and solar, heliospheric, and ionospheric science and space weather. The Murchison Widefield Array is located in Western Australia at the site of the planned Square Kilometre Array (SKA) low-band telescope and is the only low-frequency SKA precursor facility. In this paper, we review the performance properties of the Murchison Widefield Array and describe its primary scientific objectives.

scholarly journals Observations of Three Radio Galaxies with The Einstein X-Ray Observatory

1980 ◽  
Vol 5 ◽  
pp. 695-697
Author(s):  
E. D. Feigelson ◽  
E. J. Schreier
Keyword(s):  
Radio Galaxies ◽  
X Ray ◽  
Cygnus A ◽  
Early Results ◽  
Radio Lobe ◽  
Extended Radio ◽  
Double Radio Source ◽  
Parent Galaxy ◽  
Detailed Presentation ◽  
Centaurus A

We would like to present early results from the EINSTEIN X-ray Observatory on three radio galaxies: Centaurus A, NGC 315 = DW0055+30, and Cygnus A = 3C405. We hope to demonstrate that imaging X-ray astronomy can provide important insights into the physics and environment of radio galaxies and their extended radio components.NGC 5128, the parent galaxy of the double-double radio source Centaurus A, is the nearest radio galaxy, providing the best testing ground for high resolution X-ray studies. The X-ray morphology has proved to be rich and varied. We detect four distinct components to the X-ray emission: (1) the strong, compact nucleus detected by earlier satellites; (2) extended emission around the nucleus; (3) emission from the inner radio lobes; and (4) a unique X-ray jet between the nucleus and the NE radio lobe. A detailed presentation of these observations can be found in Schreier et al. (1979).

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 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 Deconvolving the Nucleus of Centaurus A Using Chandra PSF Library

2001 ◽  
Vol 205 ◽  
pp. 66-69
Author(s):  
Margarita Karovska ◽  
T. Aldcroft ◽  
M.S. Elvis ◽  
I.N. Evans ◽  
G. Fabbiano ◽  
...  
Keyword(s):  
Black Hole ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Central Source ◽  
X Ray ◽  
Preliminary Results ◽  
Multi Scale ◽  
Supermassive Black Hole ◽  
Scale Structures ◽  
Centaurus A

We describe preliminary results from our study of multi-scale structures in Centaurus A (NGC 5128) obtained using the Chandra X-ray Observatory HRC-I observations. The high-angular resolution Chandra images reveal X-ray multi-scale structures in this object with unprecedented detail and clarity. The region surrounding the Cen A nucleus, believed to be associated with a supermassive black hole, shows structures on arcsecond scales clearly resolved from the central source.

scholarly journals High-energy particle acceleration at the radio-lobe shock of Centaurus A

2009 ◽  
Vol 395 (4) ◽  
pp. 1999-2012 ◽  
Author(s):  
J. H. Croston ◽  
R. P. Kraft ◽  
M. J. Hardcastle ◽  
M. Birkinshaw ◽  
D. M. Worrall ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Radio Lobe ◽  
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
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