The Origin of Lyα Absorption Systems at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \… | Zendy

HsiaoWen Chen | Zendy; Kenneth M. Lanzetta | Zendy; A. Fernández-Soto | Zendy

Open Access

The Origin of Lyα Absorption Systems at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \…

Author(s) -

HsiaoWen Chen,

Kenneth M. Lanzetta,

A. Fernández-Soto

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308669

Subject(s) - redshift , galaxy , physics , astrophysics , measure (data warehouse) , absorption (acoustics) , redshift survey , optics , database , computer science

The Hubble Deep Field images have provided us with a unique chance to relatestatistical properties of high-redshift galaxies to statistical properties of\lya absorption systems. Combining an {\em empirical} measure of the galaxysurface density versus redshift with an {\em empirical} measure of the gaseousextent of galaxies, we predict the number density of \lya absorption systemsthat originate in extended gaseous envelopes of galaxies versus redshift. Weshow that at least 50% and as much as 100% of observed \lya absorption systemsof $W\apg0.32$ \AA can be explained by extended gaseous envelops of galaxies.Therefore, we conclude that known galaxies of known gaseous extent must producea significant fraction and perhaps all of \lya absorption systems over a largeredshift range.Comment: 12 pages, 3 figures, accepted for publication in the Astrophysical Journal, April 10, 2000 issu

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