CLUSTERING PROPERTIES OF THE LYα CLOUDS

1995/05/29 by S. Cristiani, S. D'Odorico, S. D’Odorico +11
Computer Science · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Polynomial and algebraic computation #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9505131

4 pages uuencoded compressed postscript, to appear in the proceedings of the XXXth MORIOND meeting: "Clustering in the Universe"

arxiv created 1995/05/29 · openalex publication_date 1995/05/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The spectra of the QSOs PKS2126-158 (z_em=3.27) and Q0055-269 (z_em=3.66) have been observed at high resolution (2.2 - 2.7 × 10⁴). Significant clustering, with ξ≃ 1 at Δv=100 km s^-1, is detected in both cases for lines with log N_HI ≥ 13.8. A similar result is obtained analysing the data available in the literature for Q0014+81. An anticlustering signal is also detected on scales Δv ∼ 600 km s^-1. Two voids of size ∼ 2000 km s^-1 are found in the spectrum of Q0055-269 with a probability of 2× 10^-4.

Related

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• Coincidences of high density peaks in UVES spectra of QSO pairs
• Ly alpha Cloud Size Evolution and Shape from QSO Groups
• STIS Spectroscopy of PKS 0405-123