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Title:
Rings and wiggles in Hercules A
Authors:
Dreher, J. W.; Feigelson, E. D.
Affiliation:
AA(MIT, Cambridge, MA), AB(Pennsylvania State University, University Park, PA; MIT, Cambridge, MA)
Publication:
Nature (ISSN 0028-0836), vol. 308, March 1, 1984, p. 43-45. (Nature Homepage)
Publication Date:
03/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
EXTRAGALACTIC RADIO SOURCES, GALACTIC STRUCTURE, RADIO GALAXIES, ASTRONOMICAL MAPS, PLASMA JETS, RADIO TELESCOPES, VERY LARGE ARRAY (VLA)
DOI:
10.1038/308043a0
Bibliographic Code:
1984Natur.308...43D

Abstract

The first results from extensive observations of Her A, the fourth brightest extragalactic radio source in the sky at low frequencies, made with the Very Large Array of the National Radio Astronomy Observatory are reported. It is found that Her A possesses an unusual jet-dominated morphology instead of the Cygnus-A-like morphology expected for such a powerful radio source. Its two jets are quite different in appearance; one appears to be a continuous twisting jet, while the other suggests repeated ejection of individual plasmons by the central object. The questions raised by the presence of such different morphologies in the same source concerning the generation and evolution of extended extragalactic radio sources are discussed. Variations in the central engine provide the simplest interpretation for some of the features of this object; the role of environmental effects is less clear.
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