|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Bars and Cold Dark Matter Halos | | P. Colin
; O. Valenzuela & A. Klypin
; | | Date: |
27 Jun 2005 | | Subject: | astro-ph | | Affiliation: | CRyA, UNAM), O. Valenzuela (Univ. of Washington) & A. Klypin (NMSU | | Abstract: | The central part of a dark matter halo react to the presence and evolution of a bar. Not only the halo absorbs angular momentum from the disk but it can also be compressed and see its shape modified. We study these issues in a series of cosmologically motivated, highly resolved, N-body simulations of barred galaxies run under different initial conditions. In all models, we find that the inner halo central density increases. We model this density increase using the standard adiabatic approximation and find that halo mass profiles are well reproduced in models in which the bars evolve secularly into a (pseudo) bulge. For other models, the approximation overestimates the density. We find by the end of the simulated evolution and for those models for which the bar survives 5 Gyr, a near prolate ellipsoidal dark matter figure aligned to the disk bar. In models with a disk strong bar, the alignment between the disk and the `halo bar’ is reached after ~ 2 Gyr. The torque the halo bar exerts over the disk bar can serve as a mechanism to regulate the angular momentum transfer from the disk to the halo. We measure the minor-to-major axial ratios of these halo bars and find they are around 0.7. | | Source: | arXiv, astro-ph/0506627 | | 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