Other
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..456v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 456-463.
Other
19
Cosmic Dust, Cygnus Constellation, Elliptical Galaxies, Galactic Nuclei, Imaging Techniques, Radio Galaxies, Emission Spectra, High Resolution, Line Spectra, Luminosity
Scientific paper
New obtained high resolution optical images of the prototypical luminous radio galaxy Cygnus A (3C 405) indicate an inhomogeneous distribution of obscuring dust and, in combination with previous data, three types of radiation (stellar and blue featureless continuum as well as luminous line emission) in its central regions. The alleged double nucleus finds its origin in heavy obscuration coupled to excess line emission in the central regions of an otherwise normal giant elliptical galaxy. A strongly reddened nuclear component, coincident with the Cygnus A radio core, is found to emit faint but concentrated narrow line emission. All data appear consistent with identification of Cygnus A as a radio-loud quasar having its radio axis oriented at about 35 deg from the sky plane. The presumed dust torus obscuring the quasar continuum is inferred to be smaller than 800 parsec.
Barthel Peter D.
Vestergaard Marianne
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