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The clustering of Lα absorption lines in the QSO spectra

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For nine published high-resolution QSO spectra a correlation analysis of their Lα forest lines has been performed. The two-point correlation functions show some quasi-periodic structure of magnitude |ξ|≲0.3. Their characteristic separation along the line-of-sight amounts to Δs 0=3×10−3 or to Δs 0=5×10−3 for Ω=1 and 0.2, respectively. Especially the distribution of nearest neighbouring line positions in two close QSO pairs allows for the interpretation that the absorption clouds lie in sheet-like structures as predicted by the pancake theory. The correlation data contain some hints on metal absorbers within the forest of unidentified lines.

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Mücket, J.P., Müller, V. The clustering of Lα absorption lines in the QSO spectra. Astrophys Space Sci 139, 163–174 (1987). https://doi.org/10.1007/BF00643822

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  • Correlation Analysis
  • Correlation Function
  • Absorption Line
  • Correlation Data
  • Line Position