|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'502'364
Articles rated: 2609
23 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A Group-Group Merger at a Redshift of z = 0.84? | | L.M. Lubin
; M. Postman
; J.B. Oke
; | | Date: |
7 May 1998 | | Subject: | astro-ph | | Affiliation: | Caltech), M. Postman (STScI), J.B. Oke (DAO | | Abstract: | We present a dynamical study of the CL0023+0423 system at a redshift of z = 0.84. This system consists of two components separated in velocity space by 2900 km/s and on the plane of the sky by 0.23 h^{-1} Mpc. A kinematic analysis indicates that the two components are a poor cluster with a velocity dispersion of 415 km/s and a less massive group with a velocity dispersion of 158 km/s (Postman, Lubin & Oke 1998). An analytic two-body calculation and N-body simulations indicate that the system is most likely not bound but simply a chance projection on the sky; however, within the observational uncertainties, there do exist bound solutions where the two galaxy groups are currently moving toward each other and will eventually merge. A statistical analysis of 1000 N-body simulations indicates that there is an 20% chance that the two groups will merge. If the CL0023+0423 system does merge, it will appear as a cluster on the sky, as well as in velocity space, within 1-2 Gyrs. The cluster will evolve dynamically for more than 3 Gyrs, appearing during this time more similar to an open, irregular cluster. The final merged system has a velocity dispersion which is consistent with a local Abell richness class 1 cluster. The morphological analysis of the galaxy populations of CL0023+0423 suggests that both groups are largely dominated by spiral galaxies with early-type fractions of 33% or less (Lubin et al. 1998). These modest early-type fractions may have implications for both cluster formation and group evolution. A comparison with nearby and intermediate-redshift groups and clusters of galaxies suggest that some fraction of early-type galaxies are formed at redshifts of z < 1. | | Source: | arXiv, astro-ph/9805099 | | Other source: | [GID 597039] astro-ph/9805099 | | 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