English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We searched for cluster X-ray luminosity and radius evolution using oursample of 200 galaxy clusters detected in the 160 deg^2 survey with the ROSATPSPC (Vikhlinin et al. 1998, astro-ph/9803099). With such a large area survey,it is possible, for the first time with ROSAT, to test the evolution ofluminous clusters, Lx > 3x10^44 erg/s, in the 0.5-2 keV band. We detect afactor of 3-4 deficit of such luminous clusters at z>0.3 compared to thepresent. The evolution is much weaker or absent at modestly lower luminosities,1-3x10^44 erg/s. At still lower luminosities, we find no evolution from theanalysis of the log N - log S relation. The results in the two upper Lx binsare in agreement with the Einstein EMSS evolution result (Gioia et al. 1990a,Henry et al. 1992) while being obtained using a completely independent clustersample. The low-Lx results are in agreement with other ROSAT surveys (e.g.Rosati et al. 1998, Jones et al. 1998).  We also compare the distribution of core radii of nearby and distant (z>0.4)luminous (with equivalent temperatures 4-7 keV) clusters, and detect noevolution. The ratio of average core radius for z~0.5 and z<0.1 clusters is0.9+/-0.1, and the core radius distributions are remarkably similar. A decreaseof cluster sizes incompatible with our data is predicted by self-similarevolution models for high-Omega universe.Comment: 5 pages including 3 ps figures, uses enclosed emulateapj.sty. ApJ  Letters, in pres

Evolution of Cluster X-Ray Luminosities and Radii: Results from the 160 Square Degree [ITAL]ROSAT[/ITAL] Survey