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首页> 外文期刊>The Astrophysical journal >DAMPED LYMAN-ALPHA AND LYMAN-LIMIT ABSORBERS IN THE COLD DARK MATTER MODEL
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DAMPED LYMAN-ALPHA AND LYMAN-LIMIT ABSORBERS IN THE COLD DARK MATTER MODEL

机译：冷暗物质模型中的阻尼Lyman-Alpha和Lyman极限吸收剂

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摘要

We study the formation of damped Lyα and Lyman-limit absorbers in a hierarchical clustering scenario using a gasdynamieal simulation of an Ω = 1 cold dark matter universe. In the simulation, these high column density systems are associated with forming galaxies. Damped Lyα absorption, N_(H I) approx> 10~(20.2) cm~(-2), arises along lines of sight that pass near the centers of relatively massive, dense protogalaxies. Lyman-limit absorption, 10~(17) cm~(-2) approx< N_(H I) approx< 10~(20.2) cm~(-2), develops on lines of sight that pass through the outer parts of such objects or near the centers of smaller protogalaxies. The number of Lyman-limit systems is less than observed, while the number of damped Lyα systems is quite close to the observed abundance. Damped absorbers are typically ～10 kpc in radius, but the population has a large total cross section because the systems are much more numerous than present-day L_* galaxies. Our results demonstrate that high column density systems like those observed arise naturally in a hierarchical theory of galaxy formation and that it is now possible to study these absorbers directly from numerical simulations.
机译：我们使用Ω= 1冷暗物质宇宙的气动力模拟研究了分层聚类情况下阻尼Lya和Lyman极限吸收剂的形成。在模拟中，这些高列密度系统与形成星系有关。衰减的Lyα吸收，N_（H I）大约> 10〜（20.2）cm〜（-2），沿着视线出现，该视线通过相对较大且密集的原星系的中心附近。莱曼极限吸收在穿过此类物体外部的视线上形成，约10〜（17）cm〜（-2）约

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