Clustering and voids in the Lyman-alpha forest

Details Clustering and voids in the Lyman-alpha forest Clustering and voids in the Lyman-alpha forest

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327l..35o&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 327, April 15, 1988, p. L35-L39.

Statistics

Computation

52

Absorption Spectra, Galactic Clusters, Hubble Constant, Line Spectra, Lyman Alpha Radiation, Quasars, Computational Astrophysics, Poisson Density Functions, Red Shift, Statistical Analysis

Scientific paper

In a statistical study of quasar absorption lines, no evidence is found for large voids in the Ly-alpha forest, contrary to some recent suggestions. The 28 Mpc gap found by Crotts (1987) in the spectrum of Q0420-388 is not statistically significant, and it is possible, from a sample of 18 quasar spectra, to reject at the 2 sigma level the hypothesis that comoving voids of 30 Mpc fill as much as 15 percent of the universe. However, a significant (at the 99 percent level) excess of small line intervals of velocity width 200-600 km/s is found. This provides evidence either for the gravitationally induced correlations proposed in some models or for the fragmented shells proposed in others.

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