SIMBAD references

1999ApJS..122..355V - Astrophys. J., Suppl. Ser., 122, 355-414 (1999/June-0)

Clustering properties of low-redshift QSO absorption systems toward the galactic poles.

VANDEN BERK D.E., LAUROESCH J.T., STOUGHTON C., SZALAY A.S., KOO D.C., CROTTS A.P.S., BLADES J.C., MELOTT A.L., BOYLE B.J., BROADHURST T.J. and YORK D.G.

Abstract (from CDS):

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: These results are consistent with a picture of the Lyα forest at low redshift in which some fraction of the Lyα lines arise in close proximity to galaxies and structures traced by galaxies, but in which a substantial fraction of the systems are also more uniformly distributed and are largely unrelated to the distribution of luminous galaxies. The results also appear to be in broad agreement with numerical simulations of the intergalactic medium, which suggest that the denser regions traced by luminous galaxies are also traced by the stronger Lyα systems, but that Lyα systems also arise in the more general underlying distribution of matter in the universe.

Abstract Copyright:

Journal keyword(s): Galaxies: Intergalactic Medium - Cosmology: Large-Scale Structure of Universe - Galaxies: Quasars: Absorption Lines - Ultraviolet: Galaxies

VizieR on-line data: <Available at CDS (J/ApJS/122/355): tables 4 – 16>

Simbad objects: 16

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