Discovery of an infrared nucleus in Cygnus A - an obscured quasar revealed?

Details Discovery of an infrared nucleus in Cygnus A - an obscured quasar revealed? Discovery of an infrared nucleus in Cygnus A - an obscured quasar revealed?

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..67d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 10, 1991, p. L67-L70. Research supported by Alfred P. Sl

Physics

Optics

68

Active Galactic Nuclei, Astronomical Photometry, Cygnus Constellation, Infrared Imagery, Quasars, Radio Galaxies, Cassegrain Optics, Luminous Intensity

Scientific paper

This paper reports on the discovery of a compact, unresolved infrared nucleus, coincident with the radio core, in the prototypical powerful radio galaxy Cygnus A (3C 405). The infrared colors and magnitudes of the nucleus can be explained as a highly reddened extension of the radio continuum. The implied restframe extinction is A(V) equal to about 50 + or - 30 magnitudes. The extinction-corrected luminosity of the object is in the quasar range. This discovery gives some support to the unification models for quasars and powerful radio galaxies.

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