|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Damped Lyman-alpha and Lyman Limit Absorbers in the Cold Dark Matter Model | | Neal Katz
; David H. Weinberg
; Lars Hernquist
; Jordi Miralda-Escude
; | | Date: |
21 Sep 1995 | | Journal: | Astrophys.J. 457 (1996) L57 | | Subject: | astro-ph | | Affiliation: | U. Washington), David H. Weinberg (Ohio State), Lars Hernquist (U.C. Santa Cruz), and Jordi Miralda-Escude (IAS | | Abstract: | We study the formation of damped lya and Lyman limit absorbers in a hierarchical clustering scenario using a gas dynamical simulation of an $Omega = 1$, cold dark matter universe. In the simulation, these high column density systems are associated with forming galaxies. Damped lya absorption, $N_{HI} simgt 10^{20.2}cm^{-2}$, arises along lines of sight that pass near the centers of relatively massive, dense protogalaxies. Lyman limit absorption, $10^{17}cm^{-2} simlt N_{HI} simlt 10^{20.2}cm^{-2}$, 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 lya systems is quite close to the observed abundance. Damped absorbers are typically $sim 10$ 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. | | Source: | arXiv, astro-ph/9509106 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER