| | |
| | |
Stat |
Members: 3661 Articles: 2'599'751 Articles rated: 2609
11 November 2024 |
|
| | | |
|
Article overview
| |
|
A Morphology--Cosmology Connection for X--Ray Clusters | August Evrard
; Joseph Mohr
; Daniel Fabricant & Margaret Geller
; | Date: |
1 Oct 1993 | Journal: | Astrophys.J. 419 (1993) L9 | Subject: | astro-ph | Abstract: | We employ N--body/$3D$ gas dynamic simulations of the formation of galaxy clusters to determine whether cluster X--ray morphologies can be used as cosmological constraints. Confirming the analytic expectations of Richstone, Loeb, Turner, we demonstrate that cluster evolution is sensitive to the cosmological model in which the clusters form. We further show that evolutionary differences are echoed in the gross morphological features of the cluster X--ray emission. We examine current--epoch X--ray images of models originating from the same initial density fields evolved in three different cosmologies: (i) an unbiased, low density universe with $Omega_o se 0.2$; (ii) an unbiased universe dominated by vacuum energy with $Omega_o se 0.2$ and $lambda_o se 0.8$ and (iii) a biased Einstein--deSitter model ($Omega se 1$, $sigma_8=0.59$). Using measures of X--ray morphology such as the axial ratio and centroid shifting, we demonstrate that clusters evolved in the two low $Omega_o$ models are much more regular, spherically symmetric, and centrally condensed than clusters evolved in the Einstein--deSitter model. This morphology--cosmology connection, along with the availability of a large body of cluster X--ray observations, makes cluster X--ray morphology both a powerful and a practical cosmological discriminant. | Source: | arXiv, astro-ph/9310002 | 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.
|
| |
|
|
|