Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264...87b&link_type=abstract
Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 87-91.
Astronomy and Astrophysics
Astrophysics
33
Absorption Spectra, Centimeter Waves, Hydrogen Atoms, Quasars, Gravitational Lenses, Line Spectra
Scientific paper
An absorption line at 988.7 MHz toward the quasar 3C 196 has been detected. The absorption line is identified as the 21 cm line of neutral atomic hydrogen observed at a redshift of Z equals 0.4366. The optical QSO is a very weak radio source of less than 1 MJy. To account for the approximate 0.5 Jy observed in the absorption line, it is postulated that the diameter of the absorbing region is at least as large as 750 pc and perhaps even larger than 30 kpc. An optical wisp of about 3 arcsec x 1 arcsec extends from the first QSO at a position angle of about 120 degrees in a direction perpendicular to the separation of the radio lobes. The H I absorption is evidence for absorption in a galactic halo if the wisp is the disk of an intervening galaxy
Brown Raymon L.
Mitchell Kenneth J.
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