Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..347j&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 347-352.
Astronomy and Astrophysics
Astrophysics
4
Absorption Spectra, Line Spectra, Quasars, Random Noise, Red Shift, Spectrum Analysis, Random Processes, Statistical Analysis, Tables (Data)
Scientific paper
A method is presented for estimating the number of accidental redshift systems in quasar absorption-line spectra. The method is based on the use of simulated sets of standard spectral lines in which correlations among the actual line wavelengths of specific ions are neglected. This method is applied to the observed spectra of Ton 1530, PHL 938, and PHL 957. Higher estimates of the number of accidental systems are derived than those obtained by some previous investigators. The original method devised by Bahcall (1968) gives a reasonable lower limit to the number of accidental systems, while the present method gives a reasonable upper limit to the number of such systems.
Joss Paul C.
Ruffa Gregory J.
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