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THE ORIGIN OF Lyα ABSORPTION SYSTEMS AT z > 1: IMPLICATIONS FROM THE HUBBLE DEEP FIELD

机译:在z> 1:时Lyα吸收系统的起源来自深层磁场的影响

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摘要

The Hubble Deep Field images have provided us with a unique chance to relate statistical properties of high-redshift galaxies to statistical properties of Lyα absorption systems. Combining an empirical measure of the galaxy surface density versus redshift with an empirical measure of the gaseous extent of galaxies, we predict the number density of Lyα absorption systems that originate in extended gaseous envelopes of galaxies versus redshift. We show that at least 50/100 and as much as 100/100 of observed Lyα absorption systems of W ≈> 0.32 A can be explained by extended gaseous envelopes of galaxies. There- fore, we conclude that known galaxies of known gaseous extent must produce a significant fraction and perhaps all of Lyα absorption systems over a large redshift range.
机译:哈勃深场影像为我们提供了独特的机会,可以将高红移星系的统计特性与Lyα吸收系统的统计特性相关联。结合对银河表面密度与红移的经验测度与对银河系气态程度的经验测度相结合,我们预测了起源于银河系与红移扩展气态包膜的Lyα吸收系统的数量密度。我们表明,至少有50/100到100/100的W≈> 0.32 A的Lyα吸收系统可以用星系的气态包膜扩展来解释。因此,我们得出的结论是,已知气态的已知星系必须在很大的红移范围内产生很大一部分,甚至可能产生所有的Lyα吸收系统。

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