The Origin of \lya Absorption Systems at $z>1$---Implications from the Hubble Deep Field

Details The Origin of \lya Absorption Systems at $z>1$---Implications from the Hubble Deep Field The Origin of \lya Absorption Systems at $z>1$---Implications from the Hubble Deep Field

1999-12-07

arxiv.org/abs/astro-ph/9912122v1

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures, accepted for publication in the Astrophysical Journal, April 10, 2000 issue

Scientific paper

10.1086/308669

The Hubble Deep Field images have provided us with a unique chance to relate statistical properties of high-redshift galaxies to statistical properties of \lya absorption systems. Combining an {\em empirical} measure of the galaxy surface density versus redshift with an {\em empirical} measure of the gaseous extent of galaxies, we predict the number density of \lya absorption systems that originate in extended gaseous envelopes of galaxies versus redshift. We show that at least 50% and as much as 100% of observed \lya absorption systems of $W\apg0.32$ \AA can be explained by extended gaseous envelops of galaxies. Therefore, we conclude that known galaxies of known gaseous extent must produce a significant fraction and perhaps all of \lya absorption systems over a large redshift range.

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