Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-11-11
Astronomy and Astrophysics
Astrophysics
uuencoded compressed PS file, including 2 figures. Contribution to the 11th Potsdam Cosmology Workshop, Potsdam, 18 -- 24 Sept
Scientific paper
We investigate, using high resolution N-body simulations, the density profiles and the morphologies of galaxy clusters in three models of structure formation. We show that these properties are closely related to the occurrence of a significant merging event to a cluster in the recent past. The three models are: (1) the standard CDM model (SCDM) with $\Omega_0 = 1$, $\Lambda_0=0$ and $h=0.5$; (2) a low-density flat model (LCDM) with $\Omega_0=0.3$, $\Lambda_0=0.7$ and $h=0.75$; (3) a CDM dominated open model (OCDM) with $\Omega_0=0.1$, $\Lambda_0=0$. We find that the clusters in the OCDM model have the steepest density profiles, their density contours are the roundest and show the smallest center shifts, among the three models. The clusters in the SCDM model have contours that are most elongated and show the largest center shifts, indicating the existence of frequent mergers in the recent past. The clusters in the LCDM model have density profiles and center shifts (in their density contours) similar to those in the SCDM model, although the density contours tend to be rounder. Our results show that, although the density profiles and morphologies of clusters depend on models of structure formation, the LCDM model, which is currently considered as a successful alternative to the SCDM model, can do as well in producing a substantial fraction of clusters with substructures. This is in contrast to the conception that this model may have serious problem in this aspect.
Boerner Gerhard
Fang L.-Z.
Jing Yi-Peng
Mo Hou-Jun
No associations
LandOfFree
Substructures of Clusters and Cosmological Models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Substructures of Clusters and Cosmological Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Substructures of Clusters and Cosmological Models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-18960