Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5810e&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #58.10; Bulletin of the American Astronomical Society, Vol. 31, p.917
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The abundance of distant clusters is a sensitive probe of cosmology. We explore theoretical expectations for distant counts using clusters extracted from deep, light-cone datasets of the Hubble Volume simulations. Two cold, dark matter (CDM) dominated models with flat metric geometries are employed: a tau CDM model dominated by matter (Omega_m = 1) and a LCDM model dominated by vacuum energy (Omega_ Lambda =0.7, Omega_m = 0.3). Each simulation uses one billion particles in cubes of side lengths 2000/h (tau CDM) and 3000/h (LCDM) Mpc. Examining synthetic sky surveys covering pi steradians which extend to redshift z =~ 1.3, we identify ~ 10(5) clusters more massive than {10(14) h(-1) M_sun}. Clear differences in the redshift evolution of the population are apparent between the two cosmologies. Guided by gas dynamic simulations of cluster formation, we make predictions for the expected behavior in X-ray and Sunyaev-Zel'dovich counts. The impact on current and future surveys of distant clusters is discussed.
Evrard August E.
Virgo Collaboration
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