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- W2096929477 abstract "We examine the clustering properties of low-redshift Lyα and heavy-element QSO absorption line systems seen in the spectra of 13 QSOs at the Galactic poles. This is the densest sample of ~1° separated QSOs observed spectroscopically with the Hubble Space Telescope to date. At the median redshift of the Lyα sample (z ≈ 0.7), the QSO lines of sight are separated on transverse scales from about 15 to 200 h-1 Mpc (q0=0.5, H=100 h km s-1 Mpc-1), allowing the three-dimensional clustering of the absorbers to be examined on those scales. The Galactic poles are also regions where relatively deep and wide-field galaxy redshift surveys have taken place, so the distributions of galaxies and Lyα systems can be compared within the same volume of space. There are 545 total absorption lines detected in the complete sample from 13 QSOs. We identify 307 Lyα systems, of which 18 contain heavy-element lines. We confirm the relatively slow redshift number density evolution for Lyα systems at z≲1. There are also five likely C IV doublets in our sample, for which the Lyα line is not accessible. The main results are summarized as follows:" @default.
- W2096929477 created "2016-06-24" @default.
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- W2096929477 date "1999-06-01" @default.
- W2096929477 modified "2023-09-27" @default.
- W2096929477 title "Clustering Properties of Low‐Redshift QSO Absorption Systems Toward the Galactic Poles" @default.
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