The Stanford Cluster Search: Scope, method, and preliminary results

Citation
Ja. Willick et al., The Stanford Cluster Search: Scope, method, and preliminary results, PUB AST S P, 113(784), 2001, pp. 658-676
Citations number
69
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN journal
0004-6280 → ACNP
Volume
113
Issue
784
Year of publication
2001
Pages
658 - 676
Database
ISI
SICI code
0004-6280(200106)113:784<658:TSCSSM>2.0.ZU;2-Q
Abstract
We describe the scientific motivation behind, and the methodology of, the S tanford Cluster Search (StaCS), a program to compile a catalog of optically selected galaxy clusters at intermediate and high (0.3 less than or simila r to z less than or similar to 1) redshifts. The clusters are identified us ing a matched filter algorithm applied to deep CCD images covering similar to 60 deg(2) of sky. These images are obtained from several data archives, principally that of the Berkeley Supernova Cosmology Project of Perlmutter et al. Potential clusters are confirmed with spectroscopic observations at the 9.2 m Hobby-Eberly Telescope. Follow-up observations at optical, submil limeter, and X-ray wavelengths are planned in order to estimate cluster mas ses. Our long-term scientific goal is to measure the cluster number density as a function of mass and redshift, n(M, z), which is sensitive to the cos mological density parameter Omega (m) and the amplitude of density fluctuat ions sigma (8). The combined data set will contain clusters ranging over an order of magnitude in mass and allow constraints on these parameters accur ate to similar to 10%. We present our first spectroscopically confirmed clu ster candidates and describe how to access them electronically.