Evidence for a quasar in the radio galaxy Cygnus A from observation of broad-line emission

Details Evidence for a quasar in the radio galaxy Cygnus A from observation of broad-line emission Evidence for a quasar in the radio galaxy Cygnus A from observation of broad-line emission

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994natur.371..313a&link_type=abstract

Nature, Volume 371, Issue 6495, pp. 313-314 (1994).

Physics

54

Scientific paper

ACTIVE galaxies are thought to be powered by the accretion of surrounding dust and gas onto central black holes. The unified model1-3 of active galaxies predicts that narrow-line radio galaxies (NLRGs), which are very luminous at radio wavelengths and have narrow optical emission lines, would appear as quasars—which have broad emission lines—if viewed from a different direction. The nearby NLRG Cygnus A is the most luminous radio source in the local Universe, with a luminosity that lies within the range of that of quasars4, but the polarization of optical light from this source seems at odds with the quasar model. Here we present evidence, in the form of broad ultraviolet line emission from singly ionized magnesium, that Cygnus A does indeed host a quasar.

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