|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Formation of Dark Matter Halos | | J. R. Primack
; J. S. Bullock
; A. A. Klypin
; A. V. Kravtsov
; | | Date: |
12 Dec 1998 | | Subject: | astro-ph | | Affiliation: | UCSC), A. A. Klypin and A. V. Kravtsov (NMSU | | Abstract: | This article concerns the formation and structure of dark matter halos, including (1) their radial density profiles, (2) their abundance, and (3) their merger rates. The last topic may be relevant to the nature of the small, bright, high-redshift galaxies discovered by the Lyman break technique. (1) Study of a statistical sample of galaxy-mass dark halos in high-resolution Adaptive Refinement Tree simulations shows that they have a central density profile p(r) propto 1/r^g with g approx 0.2, in agreement with data on dark-matter-dominated disk galaxies. We present recent, higher resolution results on this. (2) Another important new result is that the Press-Schechter approximation predicts about twice as many galaxy-mass halos at z=0 as are present in large dissipationless N-body simulations; more generally, PS overpredicts the abundance of M ~< 0.1M_* halos at all redshifts. (3) Finally, we discuss the assembly of these halos, in particular the merger rate of (sub-)halos at high redshift and the distribution of the starbursts that these mergers are likely to trigger. If most of the Lyman-break galaxies are such starbursts, this perhaps resolves the apparent paradox that these galaxies appear to cluster like massive halos (~10^{12} M_odot), while their relatively low linewidths and their spectral energy distributions suggest that they have relatively low mass (few X 10^{10} M_odot) and young ages (few X 10^8 yr). It also predicts much more star formation at high redshift in CDM-type hierarchical models for structure formation than if only quiescent star formation is included. | | Source: | arXiv, astro-ph/9812241 | | 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