Age, Evolution, and Dispersion of the Loose Groups of Blue Stars in the Northeast Radio Lobe of Centaurus A

2000 ◽  
Vol 538 (2) ◽  
pp. 594-607 ◽  
Author(s):  
Caleb I. Fassett ◽  
John A. Graham
Keyword(s):  
Radio Lobe ◽  
Centaurus A

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 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 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 THE JET HEATED X-RAY FILAMENT IN THE CENTAURUS A NORTHERN MIDDLE RADIO LOBE

2009 ◽  
Vol 698 (2) ◽  
pp. 2036-2047 ◽  
Author(s):  
R. P. Kraft ◽  
W. R. Forman ◽  
M. J. Hardcastle ◽  
M. Birkinshaw ◽  
J. H. Croston ◽  
...  
Keyword(s):  
X Ray ◽  
Radio Lobe ◽  
Centaurus A

scholarly journals Radio and X-Ray Structure of Centaurus A

1982 ◽  
Vol 97 ◽  
pp. 107-114
Author(s):  
Eric D. Feigelson
Keyword(s):  
Radio Galaxy ◽  
Hii Regions ◽  
X Rays ◽  
Active Nucleus ◽  
Very Large Array ◽  
X Ray ◽  
Radio Lobe ◽  
Inverse Compton ◽  
Centaurus A

Recent studies of the nearby radio galaxy Centaurus A with the Very Large Array and the Einstein X-Ray Observatory reveal complex radio and X-ray structures. A prominent one-sided jet comprised of resolved knots located 0.2–6 kpc from the nucleus is seen in both radio and X-rays. The X-ray emission is probably synchrotron, requiring in situ reacceleration up to Γ ≃ 107. Inverse Compton emission is not a likely explanation though a thermal model in which the nucleus ejects dense 105M0 clouds cannot be excluded. An elongated X-ray region is also found near the “middle” radio lobe and optical HII regions ∼ 30 kpc NE of the nucleus. Conditions around the active nucleus, the absence of X-rays from the inner radio lobes, and X-ray evidence for a hot interstellar medium are briefly discussed.

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 X‐Ray Emission from the Hot Interstellar Medium and Southwest Radio Lobe of the Nearby Radio Galaxy Centaurus A

2003 ◽  
Vol 592 (1) ◽  
pp. 129-146 ◽  
Author(s):  
R. P. Kraft ◽  
S. E. Vazquez ◽  
W. R. Forman ◽  
C. Jones ◽  
S. S. Murray ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Radio Galaxy ◽  
X Ray ◽  
Radio Lobe ◽  
Centaurus A

scholarly journals Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

2021 ◽  
Author(s):  
Michael Janssen ◽  
Heino Falcke ◽  
Matthias Kadler ◽  
Eduardo Ros ◽  
Maciek Wielgus ◽  
...  
Keyword(s):  
Black Holes ◽  
Event Horizon ◽  
Galactic Nuclei ◽  
Galactic Centre ◽  
Radio Jets ◽  
Long Baseline ◽  
Wide Range ◽  
Terahertz Frequencies ◽  
Source Structure ◽  
Centaurus A

AbstractVery-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimetre wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to 10–100 gravitational radii (rg ≡ GM/c2) scales in nearby sources1. Centaurus A is the closest radio-loud source to Earth2. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our Galactic Centre. A large southern declination of −43° has, however, prevented VLBI imaging of Centaurus A below a wavelength of 1 cm thus far. Here we show the millimetre VLBI image of the source, which we obtained with the Event Horizon Telescope at 228 GHz. Compared with previous observations3, we image the jet of Centaurus A at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. We reveal a highly collimated, asymmetrically edge-brightened jet as well as the fainter counterjet. We find that the source structure of Centaurus A resembles the jet in Messier 87 on ~500 rg scales remarkably well. Furthermore, we identify the location of Centaurus A’s SMBH with respect to its resolved jet core at a wavelength of 1.3 mm and conclude that the source’s event horizon shadow4 should be visible at terahertz frequencies. This location further supports the universal scale invariance of black holes over a wide range of masses5,6.

scholarly journals Filaments in the southern giant lobe of Centaurus A: constraints on nature and origin from modelling and GMRT observations

2014 ◽  
Vol 442 (4) ◽  
pp. 2867-2882 ◽  
Author(s):  
Sarka Wykes ◽  
Huib T. Intema ◽  
Martin J. Hardcastle ◽  
Abraham Achterberg ◽  
Thomas W. Jones ◽  
...  
Keyword(s):  
Centaurus A
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