Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181p..81w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 81P-84P.
Astronomy and Astrophysics
Astronomy
9
Absorption Spectra, Emission Spectra, Line Spectra, Quasars, Red Shift, Light Speed, Metal Ions, Optical Emission Spectroscopy
Scientific paper
Spectroscopic observations of the optically selected quasar Q 0002-422 are examined which were obtained with the image dissector scanner at the Cassegrain spectrograph of the 3.9-m Anglo-Australian telescope. The Ly-alpha and C IV 1549-A lines yield a mean emission redshift of 2.77, and two prominent absorption-line systems are observed at the respective absorption redshifts of 0.8354 and 2.2996. The absorption systems and emission spectra of Q 0002-422 and Q 0453-423 are compared, and the absorption-line system at the smaller redshift in Q 0002-422 is shown to be at a velocity of 0.62c with respect to the emission-line system. The Fe II and Mg II equivalent widths in the same absorption-line system in Q 0002-422 are found to imply a velocity dispersion of the order of 200 km/s.
Carswell Robert F.
Smith Malcolm G.
Whelan A. J. J.
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