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 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 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

A Centaurus A : Spectra of the Optical Filament

1975 ◽  
Vol 2 (6) ◽  
pp. 366-367 ◽  
Author(s):  
B.A. Peterson ◽  
R.J. Dickens ◽  
R.D. Cannon
Keyword(s):  
Radio Source ◽  
Elliptical Galaxy ◽  
Brightness Distribution ◽  
Radio Brightness ◽  
Dust Lane ◽  
X Ray ◽  
The Galaxy ◽  
Centaurus A

The radio source, Cen A, is large and complex with many peaks in the brightness distribution over an area about 4 x 10 degrees. The peculiar elliptical galaxy NGC 5128 lies between the two strong inner radio brightness peaks and is centred on a weaker central radio source. This radio source is in the centre of the dust lane which divides the galaxy and may be related to the infrared, X-ray and γ-ray sources.

scholarly journals Non-thermal emission in radio galaxy lobes – II. Centaurus A, Centaurus B, and NGC 6251

2019 ◽  
Vol 490 (2) ◽  
pp. 1489-1497 ◽  
Author(s):  
Massimo Persic ◽  
Yoel Rephaeli
Keyword(s):  
Thermal Emission ◽  
Background Radiation ◽  
Spectral Energy Distribution ◽  
Recent Analysis ◽  
Spectral Energy ◽  
Energetic Proton ◽  
X Ray ◽  
Radiation Fields ◽  
Γ Ray ◽  
Centaurus A

ABSTRACT Radio and γ-ray measurements of large lobes of several radio galaxies provide adequate basis for determining whether emission in these widely separated spectral regions is largely by energetic electrons. This is very much of interest as there is of yet no unequivocal evidence for a significant energetic proton component to account for γ-ray emission by neutral pion decay. A quantitative assessment of the pion yield spectral distribution necessitates full accounting of the local and background radiation fields in the lobes; indeed, doing so in our recent analysis of the spectral energy distribution of the Fornax A lobes considerably weakened previous conclusions on the hadronic origin of the emission measured by the Fermi satellite. We present the results of similar analyses of the measured radio, X-ray, and γ-ray emission from the lobes of Centaurus A, Centaurus B, and NGC 6251. The results indicate that the measured γ-ray emission from these lobes can be accounted for by Compton scattering of the radio-emitting electrons off the superposed radiation fields in the lobes; consequently, we set upper bounds on the energetic proton contents of the lobes.

X-Ray Observations of NGC 5128 (centaurus a) from UHURU

1973 ◽  
Vol 180 ◽  
pp. 715 ◽  
Author(s):  
W. Tucker ◽  
E. Kellogg ◽  
H. Gursky ◽  
R. Giacconi ◽  
H. Tananbaun
Keyword(s):  
X Ray ◽  
Centaurus A

The X-ray structure of Centaurus A

1981 ◽  
Vol 251 ◽  
pp. 31 ◽  
Author(s):  
E. D. Feigelson ◽  
E. J. Schreier ◽  
J. P. Delvaille ◽  
R. Giacconi ◽  
J. E. Grindlay ◽  
...  
Keyword(s):  
X Ray ◽  
Centaurus A

Measuring Graphitic Carbon and Crystalline Minerals in Coals and Bottom Ashes

1987 ◽  
Vol 31 ◽  
pp. 343-349 ◽  
Author(s):  
David L. Wertz ◽  
Leo W. Collins ◽  
Franz Froelicher
Keyword(s):  
Energy Source ◽  
Fly Ash ◽  
Chemical Species ◽  
Primary Energy ◽  
Toxic Chemical ◽  
Atom Pair ◽  
Crystalline Phases ◽  
X Ray ◽  
X Ray Scattering ◽  
Lignite Fly Ash

AbstractThe use of coal, as either a primary energy source or as a source of feedstock chemicals, has been complicated by the noxious and toxic chemical species formed in its gaseous effluents and also by the huge quantities of ash vhich result from its processing. Both the noxious gases and the ash have been the subjects of Federal legislations.X-ray powder patterns (XRPP), composed of atom-pair and self x~ray scattering and the diffraction produced by crystalline phases, have long been used to investigate coals and particularly their combustion ashes (1-3). Over twenty different crystalline phases have recently been reported to exist in certain lignite fly ash (3). Analysis of the crystalline phases has typically been emphasized in previous papers involving coals and ashes, but the amorphous scattering has been given little treatment.

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