Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-22
Mon.Not.Roy.Astron.Soc. 311 (2000) 657
Astronomy and Astrophysics
Astrophysics
15 pages, LaTeX, 6 Postscript figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.02966.x
The spatial distribution of Ly-alpha forest absorption systems towards ten QSOs has been analysed to search for large-scale structure over the redshift range 2.2 < z < 3.4. The QSOs form a closely spaced group on the sky and are concentrated within a 1 deg^2 field. We have employed a technique based on the first and second moments of the transmission probability density function which is capable of identifying and assessing the significance of regions of over- or underdense Ly-alpha absorption. We find evidence for large-scale structure in the distribution of Ly-alpha forest absorption at the > 99 per cent confidence level. In individual spectra we find overdense Ly-alpha absorption on scales of up to 1200 km s^-1. There is also strong evidence for correlated absorption across line of sight pairs separated by < 3 h^-1 proper Mpc (q_0 = 0.5). For larger separations the cross-correlation signal becomes progressively less significant.
Carswell Robert F.
Fernandez-Soto Alberto
Liske Jochen
Webb John K.
Williger Gerard. M.
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