Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.7205v&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #72.05; Bulletin of the American Astronomical Society, Vol. 30, p.928
Astronomy and Astrophysics
Astronomy
Scientific paper
This dissertation presents the clustering properties of a sample of low-redshift Ly alpha and heavy-element QSO absorption line systems obtained with the Faint Object Spectrograph of the Hubble Space Telescope. The QSOs are concentrated in a relatively small area towards the North Galactic Pole, which allows the clustering properties to be examined on transverse scales from about 15 to 200h(-1) Mpc (q0=0.5, Lambda =0,H0=100hkm/s/Mpc). The Ly alpha systems are significantly clustered along the lines of sight on scales up to 10h(-1) Mpc, and the amplitude of this clustering appears to depend on the limiting equivalent width of the sample. The fraction of Ly alpha systems with W>0.24{ Angstroms} which may be clustered as strongly as QSO heavy-element systems is about 40%. At very low redshifts (z<0.18) the majority of Ly alpha systems arise at the same redshifts as strong peaks in the galaxy redshift distribution in the same volume of space. At higher redshifts (0.3
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