The Cluster LX-sigma Relation Has Implications for Scale-Free Cosmologies

Abstract

I show that the cluster LX-sigma relation should be sensitive to cosmologies with a scale-free power spectrum of initial density fluctuations, P(k) ~ k^n. I derive the dependence, and argue that a conservative interpretation of current observations implies n < -2.0 and n < -1.1 at the one-sided 90% and 99% confidence levels, respectively. This result, which agrees with constraints on n from the x-ray cluster temperature function, should be roughly independent of the value of Omega or Lambda.

4 pages, including 1 figure. To appear in the Astrophysical Journal Letters

References in corpus (8)

• Properties of the Intracluster Medium in an Ensemble of Nearby Galaxy Clusters
• The Lx-T Relation and Temperature Function for Nearby Clusters Revisited
• The Imprint of Galaxy Formation on X-ray Clusters
• The Evolution of X-ray Clusters in Low Density Universes
• The Properties of Poor Groups of Galaxies: II. X-ray and Optical Comparisons
• The Average Mass Profile of Galaxy Clusters
• The impact of cooling flows on the Tx-Lbol relation for the most luminous clusters
• The Dynamics of Poor Systems of Galaxies

Cited by in corpus (2)

• Correlation Between the Halo Concentration (c) and the Virial Mass (Mvir) Determined from X-ray Clusters
• Observational tests of the delta_c-M_vir relation in hierarchical clustering models