The universal Einstein radius distribution from 10 000 SDSS clusters

Galaxy Clusters Identified from the Sdss Dr6 and Their Properties

Clusters of galaxies in most previous catalogs have redshifts z ≤ 0.3. Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we identify 39,716 clusters in the redshift range 0.05 < z < 0.6 with more than eight luminous (Mr ≤ −21) member galaxies. Cluster redshifts are estimated accurately with an uncertainty less than 0.022. The contamination ...

Clusters of Galaxies in the SDSS

I review here past and present research on clusters and groups of galaxies within the Sloan Digital Sky Survey (SDSS). I begin with a short review of the SDSS and efforts to find clusters of galaxies using both the photometric and spectroscopic SDSS data. In particular, I discuss the C4 algorithm which is designed to search for clusters and groups within a 7–dimensional data–space, i.e., simult...

Open Source Software: A Survey from 10, 000 Feet

Open source software (oss), the origins of which can be traced back to the 1950s, is software distributed with a license that allows access to its source code, free redistribution, the creation of derived works, and unrestricted use. oss applications cover most areas of consumer and business software and their study touches many disciplines, including computer science, information systems, econ...

Evolution of Intracellular Ca2+ Waves from about 10, 000 RyR Clusters: Towards Solving a Computationally Daunting Task

Toward Understanding Environmental Effects in SDSS Clusters

We find clusters and superclusters of galaxies using the Data Release 1 of the Sloan Digital Sky Survey. We calculate a low-resolution density field with a smoothing length of 10 h Mpc to characterise the density of the cluster environment. We determine the luminosity function of clusters, and investigate properties of clusters in various environments. We find that clusters in a high-density en...