On galaxy cluster sizes and temperatures

摘要: We show that the distribution of sizes and temperatures clusters can be used to constrain cosmological models. The size–temperature (ST) predicted in a flat Gaussian cluster-abundance-normalized model agrees well with fairly tight ST relation observed. A larger power-spectrum amplitude σ8 would give rise scatter about as value Ω0 and/or long non-Gaussian high-density tails probability density function. For initial conditions, suggests constraint is expected get tighter at high redshifts. In process, we derive simple formula for halo formation–redshift also suggest discrepancy between naive zero-redshift observed may owing, least part, fact lower-mass form over wider range An Appendix derives an equation haloes.