The effect of clustering on the equivalent width distribution of QSO Lyman-alpha clouds

Details The effect of clustering on the equivalent width distribution of QSO Lyman-alpha clouds The effect of clustering on the equivalent width distribution of QSO Lyman-alpha clouds

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..207b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 15, 1991, p. 207-211. Research supported by B

Astronomy and Astrophysics

Astronomy

17

Lyman Alpha Radiation, Molecular Clouds, Quasars, Spectral Line Width, Absorption Spectra, Astronomical Models, Correlation, Line Spectra

Scientific paper

A significant discrepancy is reported between the observed equivalent width distribtion p(W) of Lyman-alpha absorption features in intermediate-resolution QSO spectra and that expected from high-resolution spectra. It is found that, if clouds are randomly distributed, line blending cannot account for this effect, and the difference is interpreted as due to enhanced line blending caused by cloud-cloud clustering. Using a clustering model for the Lyman-alpha clouds, it is shown how the apparent p(W) depends on clustering properties, and an estimate of the clustering model parameters is derived by comparing the simulated p(W) to that of the real data. The clustering model deduced in this way is derived independently of and is in excellent agreement with the observed two-point correlation function.

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