An optical study of the Z = 0.437 21-cm absorber in front of 3C196

Details An optical study of the Z = 0.437 21-cm absorber in front of 3C196 An optical study of the Z = 0.437 21-cm absorber in front of 3C196

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..291b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 291-298.

Astronomy and Astrophysics

Astrophysics

14

Absorption Spectra, Centimeter Waves, Microwave Attenuation, Quasars, Radio Spectra, Astronomical Spectroscopy, Charge Coupled Devices, Gravitational Lenses, Interstellar Extinction, Red Shift

Scientific paper

Optical data for 3C196, a quasar with a prominent 21-cm absorption feature at a redshift of z = 0.437 in its radio spectrum, are analyzed in order to determine the properties of two nonstellar objects appearing at less than 2 arcsec from the QSO. It is argued that the brightest object (G1) is the galaxy responsible for both the optical and radio features at z = 0.437, while the other object (G2) is thought to be a galaxy underlying the QSO or a companion galaxy. Several other phenomena relevant to the properties of the QSO, such as Faraday rotation, relatively red color, and significant variability, are also discussed.

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