Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..276b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 276-282.
Astronomy and Astrophysics
Astrophysics
5
Absorption Spectra, Line Spectra, Lyman Alpha Radiation, Quasars, Stellar Spectra, Autocorrelation, Poisson Density Functions, Weibull Density Functions
Scientific paper
The examination of 17 Ly-alpha absorption-line samples encompassing a large range of redshifts and total numbers is conducted to describe the probability distribution function of intervals of Ly-alpha lines. Also included in the survey are 100 simulated Ly-alpha samples with no original correlation and the previous absorption-line study of Q0420-388. It is found that Poisson statistics do not describe the probability distribution function well but that Weibull statistics model the effect of line-blending for all but one sample when k = 1.72 (+0.56, -0.35). Intrinsic clustering is suggested by the renewal process formed by a random distribution of the synthetic samples. Also examined is the cross-dependence between the lines of three neighboring QSOs, and the results suggest a method for determining the mean cloud radius of hypothetical Ly-alpha absorbers.
Bi Hong-Guang
Boerner Gerhard
Chu Yan-Yi
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