Clustering and Voids in the LymanAlpha Forest
Abstract
In a statistical study of quasar absorption lines, we find no evidence for large voids in the Lyα forest, contrary to some recent suggestions. The 28 Mpc gap found by Crotts in the spectrum of Q0420388 is not statistically significant, and we can, from a sample of 18 quasar spectra, reject at the 2σ level the hypothesis that comoving voids of 30 Mpc fill as much as 15% of the universe. We do, however, find a significant (at the 99% level) excess of small line intervals of velocity width {DELTA}v ~200600 km s^1^. This provides evidence either for the gravitationally induced correlations proposed in some models or for the fragmented shells proposed in others.
 Publication:

The Astrophysical Journal
 Pub Date:
 April 1988
 DOI:
 10.1086/185135
 Bibcode:
 1988ApJ...327L..35O
 Keywords:

 Absorption Spectra;
 Galactic Clusters;
 Hubble Constant;
 Line Spectra;
 Lyman Alpha Radiation;
 Quasars;
 Computational Astrophysics;
 Poisson Density Functions;
 Red Shift;
 Statistical Analysis;
 Astrophysics;
 GALAXIES: CLUSTERING;
 QUASARS