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Title:
The structure of the Cygnus A radio galaxy
Authors:
Pierce, M. J.; Stockton, A.
Affiliation:
AA(Hawaii, University, Honolulu), AB(Royal Observatory, Edinburgh, Scotland; Hawaii, University, Honolulu)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 204-213. (ApJ Homepage)
Publication Date:
06/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, GALACTIC STRUCTURE, RADIO GALAXIES, CONTINUOUS SPECTRA, EMISSION SPECTRA, GALACTIC NUCLEI, H ALPHA LINE, INTERSTELLAR EXTINCTION, INTERSTELLAR GAS
DOI:
10.1086/164240
Bibliographic Code:
1986ApJ...305..204P

Abstract

Interference-filtered CCD optical images were obtained of Cygnus A at a wavelength of 6100 A using a FWHM 100 A bandpass and at 6495 A with a FWHM of 170 A. The data yielded a radial surface brightness profile of the region, emission line and absorption spectra, velocity field, and ratios of H-alpha flux/continuum flux near H-beta. The analytic procedures applied to the data are described. Interactions among stars, dust, emitting gas and a featureless continuum were in evidence. The continuum and emission-line radiation exhibited different distributions, with the latter displaying clumped and filamentary features. The featureless continuum radiation arose from an extended region; the generating source was not resolved.

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