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• W1756456450 abstract "We present a study of the spatial coherence of the intergalactic medium toward two pairs of high-redshift quasars with moderate angular separations observed with Keck ESI, Q1422+2309A/Q1424+2255 (zem ≈ 3.63, Δθ = 39'') and Q1439-0034A/B (zem ≈ 4.25, Δθ = 33''). The cross-correlation of transmitted flux in the Lyα forest shows a 5-7 σ peak at zero velocity lag for both pairs. This strongly suggests that at least some of the absorbing structures span the 230-300 h proper kpc transverse separation between sight lines. We also statistically examine the similarity between paired spectra as a function of transmitted flux, a measure that may be useful for comparison with numerical simulations. In investigating the dependence of the correlation functions on spectral characteristics, we find that photon noise has little effect for a signal-to-noise ratio of ≳ 10 per resolution element. However, the agreement between the autocorrelation along the line sight and the cross-correlation between sight lines, a potential test of cosmological geometry, depends significantly on instrumental resolution. Finally, we present an inventory of metal lines. These include a pair of strong C IV systems at z ≈ 3.4, appearing only toward Q1439B, and an Mg II + Fe II system present toward Q1439A/B at z ≈ 1.68." @default.
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• W1756456450 date "2004-09-20" @default.
• W1756456450 modified "2023-09-27" @default.
• W1756456450 title "Large‐Scale Correlations in the Lyα Forest atz= 3–4" @default.
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• W1756456450 doi "https://doi.org/10.1086/422870" @default.
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