Coordination number statistics of cluster formation

Cluster Arc Statistics

We study the strong gravitational lensing properties of galaxy clusters obtained from N-body simulations with standard ΛCDM cosmology. We have used the 32 most massive clusters from a simulation at various redshifts and ray-traced through the clusters to investigate the giant arcs statistics. We have found that ∼ 40 − 50% of the clusters that produce giant arcs give multiple arcs, which agrees ...

Cobalt-centred boron molecular drums with the highest coordination number in the CoB16â‹TM cluster

Cobalt-centred boron molecular drums with the highest coordination number in the CoB16− cluster

The electron deficiency and strong bonding capacity of boron have led to a vast variety of molecular structures in chemistry and materials science. Here we report the observation of highly symmetric cobalt-centered boron drum-like structures of CoB16(-), characterized by photoelectron spectroscopy and ab initio calculations. The photoelectron spectra display a relatively simple spectral pattern...

Statistics of Sunyaev-Zel’dovich Cluster Surveys

We describe a detailed analytic model for predicting statistical quantities (such as number counts, redshift distributions and sizes) of clusters detected in blank-field, thermal Sunyaev-Zel’dovich effect experiments. We include in this model the possibility of non-Gaussian density perturbations in the early Universe and also describe a simple model for the effects of preheating on cluster Suny...

Statistics of binaries in the Pleiades cluster

We present a statistical analysis of binaries in galactic clusters, based on photometric properties. Synthetic clusters are used to solve the deconvolution problem. If the colourmagnitude relation for single stars is given and if triple stars are treated as binaries, the distribution of systems in a colourmagnitude diagram (CMD) can be used to determine cluster properties. They include the maxi...