Clustering of the Lyman Alpha Clouds in the Line of Sight to the Z=3.66 QSO 0055-269

1995/01/25 by S. Cristiani, S. D’Odorico, S. D'Odorico +8
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9501092

4 pages uuencoded compressed postscript, to appear in the proceedings of the ESO Workshop on "QSO Absorption Lines", Garching 21-24 November 1994

arxiv created 1995/01/25 · openalex publication_date 1995/01/25 · arxiv updated 2009/12/01 · openalex created_date 2020/09/08 · openalex updated_date 2026/07/28

Abstract

The spectrum of the Q0055-269 (z=3.66) has been observed at the resolution of 14 km s^-1 in the wavelength interval 4750--6300 Å. The statistical distribution of the Doppler parameter for the Ly_α lines is peaked at b≃ 23 km s^-1. The column density distribution is described by a power-law with a break at log N_HI ≃ 14.5. Significant clustering, with ξ≃ 1 at Δv=100 km s^-1, is detected for lines with log N_HI ≥ 13.8. Two voids of size ∼ 2000 km s^-1 are found in the spectrum with a probability of 2× 10^-4.

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