Other
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198...91c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Jan. 1982, p. 91-110. Research supported by the Science Research C
Other
111
Absorption Spectra, Astronomical Spectroscopy, Line Spectra, Quasars, Emission Spectra, Lyman Alpha Radiation, Nebulae, Red Shift, Spectral Line Width
Scientific paper
Wavelengths and equivalent widths for 3200-5200 A-range absorption lines are presented for the QSOs Q0122-380 and Q1101-264, and a number of absorption systems are suggested. Evidence is given of velocity structure in some of these systems, and attention is drawn to continuum fitting biasses and errors and their effect on the measured equivalent widths of the absorption lines. It is found upon comparison of the Lyman-alpha absorption line densities in these and other QSOs that, while the absorption line density in a single QSO appears to increase with decreasing observed wavelength or absorption redshift, there is a small increase in mean line density with QSO emission or mean absorption redshift from QSO to QSO. This difference may be accounted for by systematic effects, and the density function is found to be consistent with that expected from a uniform space distribution of comoving absorbers in the case of the small data sample used.
Boksenberg Alec
Carswell Robert F.
Smith Malcolm G.
Tytler David
Whelan A. J. J.
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