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Title:
Discovery of an infrared nucleus in Cygnus A - an obscured quasar revealed?
Authors:
Djorgovski, S.; Weir, N.; Matthews, K.; Graham, J. R.
Affiliation:
AA(Palomar Observatory, Pasadena, CA), AB(Palomar Observatory, Pasadena, CA), AC(Palomar Observatory, Pasadena, CA), AD(Palomar Observatory, Pasadena, CA)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 10, 1991, p. L67-L70. Research supported by Alfred P. Sloan Foundation. (ApJ Homepage)
Publication Date:
05/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACTIVE GALACTIC NUCLEI, ASTRONOMICAL PHOTOMETRY, CYGNUS CONSTELLATION, INFRARED IMAGERY, QUASARS, RADIO GALAXIES, CASSEGRAIN OPTICS, LUMINOUS INTENSITY
DOI:
10.1086/186025
Bibliographic Code:
1991ApJ...372L..67D

Abstract

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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