1997/10/27 by Arlin Crotts, Crotts, Arlin
Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #FOS: Physical sciences #Ionosphere and magnetosphere dynamics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9710295
4 pages LaTeX, 1 postscript figure, 3 style files, uses psfig.sty. To appear in Proceedings of 13th IAP Colloquium: Structure and Evolution of the IGM from QSO Absorption Line Systems, eds. P. Petitjean, S. Charlot
arxiv created 1997/10/27 · openalex publication_date 1997/10/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present results from Keck HIRES, KPNO 4m/RC Spec and HST FOS spectra of a low-redshift, close QSO pair and a close, higher-redshift QSO triplet in order to explore the size evolution, shape and clustering of Ly alpha absorbers. The results we highlight here indicate that there is no strong evidence for evolution of Ly α cloud size with redshift, that strong (W > 0.4A) Ly alpha forest absorbers are probably not filaments, but probably more sheet- like. For C IV absorbers a large component of clustering on 200 km/s < Delta v < 600 km/s scales along single sightlines is due to internal velocities of single absorbers, not clustering between absorbers.