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VLBI observations of the nucleus of the radio galaxy Cygnus AThe central component of the radio galaxy Cygnus A has been observed in several (very long baseline interferometry) experiments between 1975 and 1979, and the results have been combined to derive a model for the brightness distribution. Some 65% of the nuclear emission appears to come from a compact core. The remaining flux density comes from a more extended region (or regions) up to 4 or 5 mas away lying along a position angle near 100 deg, which is close to that of the extended lobes. Evidence that compact central components reflect the collimation and transport of energy to the outer lobes of radio galaxies is discussed, and several interpretations of the observed asymmetries are considered.
Document ID
19810048597
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kellermann, K. I.
(National Radio Astronomy Observatory, Green Bank, W. Va.; Max-Planck-Institut fuer Radioastronomie Bonn, Germany)
Downes, A. J. B.
(Mullard Radio Astronomy Observatory Cambridge, United Kingdom)
Pauling-Toth, I. I. K.
(National Radio Astronomy Observatory Green Bank, WV, United States)
Preuss, E.
(National Radio Astronomy Observatory Green Bank, WV, United States)
Witzel, A.
(Max-Planck-Institut fuer Radioastronomie Bonn, Germany)
Shaffer, D. B.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1981
Publication Information
Publication: Astronomy and Astrophysics
Volume: 97
Issue: 1, Ap
Subject Category
Astrophysics
Accession Number
81A33001
Distribution Limits
Public
Copyright
Other

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