A method of identifying absorption systems in quasar spectra. I - Principles and procedure

Details A method of identifying absorption systems in quasar spectra. I - Principles and procedure A method of identifying absorption systems in quasar spectra. I - Principles and procedure

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983acaps...3..122c&link_type=abstract

(Acta Astrophysica Sinica, vol. 3, no. 2, 1983, p. 122-133) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, Sept. 1

Astronomy and Astrophysics

Astrophysics

Absorption Spectra, Quasars, Hydrogen Clouds, Line Spectra, Red Shift, Signal To Noise Ratios, Statistical Analysis

Scientific paper

A systematic method is developed for considering the problem of the identification of absorption redshift systems in the spectra of high-redshift QSOs. In this method, the identification criteria are set up and the whole redshift ranges are divided into intervals, each of which having the same composition of the 'visible' set of reference lines. The spectrum is then searched at a specific steplength and the number of systems supported by 1, 2, 3 or more identified lines are counted. The probabilities of random identifications are calculated for each visible set, and the statistical test is applied in order to isolate the systems which are in the rejection region of the null hypothesis. Next, systems with high values of the signal-to-noise ratio are selected from among the resulting systems in the last step. Finally, astrophysical considerations are applied to the surviving systems.

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