Observations of compact radio nuclei in Cygnus A, Centaurus A, and other extended radio sources

1975 ◽  
Vol 197 ◽  
pp. L113 ◽  
Author(s):  
K. I. Kellermann ◽  
B. G. Clark ◽  
A. E. Niell ◽  
D. B. Shaffer
Keyword(s):  
Radio Sources ◽  
Cygnus A ◽  
Extended Radio ◽  
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 Emission Lines: Sign of a New Energy Source?

1982 ◽  
Vol 97 ◽  
pp. 69-70
Author(s):  
David S. De Young
Keyword(s):  
Energy Source ◽  
Interstellar Medium ◽  
Emission Line ◽  
Emission Lines ◽  
Class I ◽  
Radio Sources ◽  
Extended Radio ◽  
New Energy ◽  
Centaurus A

In addition to the occurrence of emission line regions coexistent with extended radio sources which have been discussed at this Symposium, this phenomenon has been observed earlier in 3C277.3 (Miley et al. 1981) and in Centaurus A (Graham and Price 1981). This gas has been detected only in the Fanaroff and Riley “Class I” radio sources. Data concerning this class of object suggest that outflow from the nucleus is proceeding at transonic or subsonic speeds and this correlation has led to the suggestion (De Young 1981) that the origin of the emission line gas arises from entrainment of the interstellar medium into the ejected material.

scholarly journals Filaments Evolution in Extended Radio Sources

1990 ◽  
Vol 140 ◽  
pp. 457-458
Author(s):  
G. Bodo ◽  
A. Ferrari ◽  
S. Massaglia ◽  
E. Trussoni
Keyword(s):  
Magnetic Field ◽  
Time Scale ◽  
Field Direction ◽  
Cooling Time ◽  
Mhd Waves ◽  
Radio Sources ◽  
Magnetic Field Direction ◽  
Cygnus A ◽  
Extended Radio ◽  
The Magnetic Field

It has been recently shown (Bodo et al 1989) that filamentary structures observed in some extended radio sources (e.g. Cygnus A and M 87) can be related with thermal instabilities arising in the gas with a synchrotron radiating relativistic component. In particular is has been shown that, with the typical parameters of radio sources, two kind of unstable modes can develop on time scale comparable with the synchrotron cooling time: condensation stationary modes and travelling slow MHD waves. Both these kind of perturbations should lead to the formation of structures basically parallel to the magnetic field direction, as observed, however their general evolution, in particular if they will lead to the formation of dark or bright structures, cannot be extrapolated from the linear perturbative analysis.

scholarly journals The Radio Brightness Distributions over Four Discrete Sources of Cosmic Noise

1953 ◽  
Vol 6 (4) ◽  
pp. 452 ◽  
Author(s):  
BY Mllls
Keyword(s):  
Azimuth Angle ◽  
Radio Sources ◽  
Radio Brightness ◽  
Cygnus A ◽  
Wide Range ◽  
Cosmic Noise ◽  
Centaurus A

Brightness distributions have been obtained across the four radio sources, Cygnus?A, Taurus?A, Virgo?A, and Centaurus-A, using a two-aerial interferometer of a special type in which the aerial spacing and the azimuth angle of the axis may be varied over a wide range. Radio isophotes have been constructed for three of the sources from these results, making some simple assumptions as to their form. The isophotes bear some relation to optical features of the nebulae with which the sources have been identified and their radio and optical sizes are similar. The remaining source, Cygnus?A, is unfavourably situated for observations from Sydney, and the results are less complete.

The Gaseous Environments of Powerful Extended Radio Sources

1997 ◽  
Vol 480 (1) ◽  
pp. 96-114 ◽  
Author(s):  
Greg F. Wellman ◽  
Ruth A. Daly ◽  
Lin Wan
Keyword(s):  
Radio Sources ◽  
Extended Radio

Tables of physical and morphological properties of nearby extended radio galaxies

2021 ◽  
pp. 75-89
Author(s):  
R. R. Andreasyan ◽  
H. V. Abrahamyan
Keyword(s):  
Radio Galaxies ◽  
Elliptical Galaxies ◽  
Morphological Data ◽  
Morphological Properties ◽  
Radio Sources ◽  
Extragalactic Radio Sources ◽  
Extended Radio

It is brought the physical and morphological data of 267 nearby radio galaxies identified with elliptical galaxies brighter than 18th magnitude (sample 1) and for 280 extragalactic radio sources with known position angles between the integrated intrinsic radio polarization and radio axes (sample 2).

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