3CR 208.1 - A radio-loud quasar at Z = 1.02 gravitationally amplified by a foreground Seyfert galaxy at Z = 0.159

Details 3CR 208.1 - A radio-loud quasar at Z = 1.02 gravitationally amplified by a foreground Seyfert galaxy at Z = 0.159 3CR 208.1 - A radio-loud quasar at Z = 1.02 gravitationally amplified by a foreground Seyfert galaxy at Z = 0.159

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350l...1l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. L1-L4.

Other

8

Gravitational Lenses, Quasars, Radio Galaxies, Seyfert Galaxies, Astronomical Photometry, Galactic Evolution, Red Shift, Spatial Resolution, Spectrophotometry

Scientific paper

Deep high spatial resolution imaging and spectroscopy of the high-redshift radio galaxy 3CR 208.1 are presented. The observations show that this galaxy is in fact made of two distinct components separated by 3.9 arcsec and that the two components are at different redshifts. One component is the optical counterpart of the radio source and seems to be a radio-loud QSO with a redshift z = 1.011, while the other is a foreground Seyfert II galaxy with z = 0.159. Gravitational amplification calculations show that the foreground Seyfert gravitationally magnifies the QSO in the optical wavelengths by more than 0.5 mag. Moreover, the radio lobe closest to the Seyfert is amplified by more than a factor of two, which after correction leads to a real radio flux well below the 3CR catalog flux limit. Therefore, 3CR 208.1 has been included in the 3R catalog only because its radio flux has been gravitationally amplified by the foreground Seyfert galaxy. It should be reclassified as a QSO.

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