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- W2213776812 abstract "view Abstract Citations (158) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Redshift Evolution of the Ly alpha Forest Kim, Tae-Sun ; Hu, Esther M. ; Cowie, Lennox L. ; Songaila, Antoinette Abstract We have analyzed the properties of low column density Lyalpha forest clouds (12.8 <= log N_HI <= 16.0) toward 5 QSOs at different redshifts, using high signal-to-noise data from the HIRES spectrograph on the KeckI 10m telescope. The results are used to study the evolution of these clouds in the interval 2.1 < z < 3.5. We find: 1) The differential density distribution of forest clouds, f(N_HI), fits an empirical power law with a typical slope of -1.35 -> -1.55 for clouds with N_HI <= 10(14.3) cm(-2) and changes extremely slowly with redshift over this N_HI range. 2) The deviation of f(N_HI) from this power-law distribution at higher column densities depends on redshift: for higher redshifts, the departure from a power-law distribution occurs at higher N_HI, which means that higher column density clouds rapidly disappear with decreasing redshift. This may be consistent with an invariant shape for the different column density distributions, but with a shift to a lower column density normalization for systems at different redshifts driven by the overall expansion of the universe. 3) The line widths of the forest clouds increase as redshift decreases. 4) The correlation strength of the forest clouds seems to increase as redshift decreases. We discuss these results in terms of the evolution of the IGM comparing the results to models and analytic descriptions of the evolution of structure in the gas. Publication: The Astronomical Journal Pub Date: July 1997 DOI: 10.1086/118446 arXiv: arXiv:astro-ph/9704184 Bibcode: 1997AJ....114....1K Keywords: Astrophysics E-Print: 40 pages, LaTeX (aaspp4.sty), includes 4 tables + 18 encapsulated PostScript figures. To appear in The Astronomical Journal, July 1997 full text sources arXiv | ADS | data products SIMBAD (13) NED (6)" @default.
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- W2213776812 title "The Redshift Evolution of the LY alpha Forest" @default.
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