Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205..135v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 135-140.
Astronomy and Astrophysics
Astrophysics
2
Cosmic Dust, Galactic Nuclei, Radio Galaxies, Visible Spectrum, High Resolution, Quasars, Stellar Radiation
Scientific paper
Newly 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 galaxy should not be classified as a colliding pair of galaxies, or as a dust-lane galaxy. 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, corresponding 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 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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