Evolution of cluster X-ray luminosities and radii: Results from the 160 square degree rosat survey

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dc.contributor.authorVikhlinin, A
dc.contributor.authorMcNamara, BR
dc.contributor.authorForman, W
dc.contributor.authorJones, C
dc.contributor.authorQuintana, H
dc.contributor.authorHornstrup, A
dc.date.accessioned2025-01-21T01:32:42Z
dc.date.available2025-01-21T01:32:42Z
dc.date.issued1998
dc.description.abstractWe searched for cluster X-ray luminosity and radius evolution using our sample of 203 galaxy clusters detected in the 160 deg(2) survey with the ROSAT PSPC (Vikhlinin et al.). With such a large area survey, it is possible, for the first time with ROSAT, to test the evolution of luminous clusters, L-X > 3 x 10(44) ergs s(-1) in the 0.5-2 keV band. We detect a factor of 3-4 deficit of such luminous clusters at z > 0.3 compared with the present. The evolution is much weaker or absent at modestly lower luminosities, (1-3) x 10(44) ergs s(-1). At still lower luminosities, we find no evolution from the analysis of the log N-log S relation. The results in the two upper L, bins are in agreement with the Einstein Extended Medium-Sensitivity Survey evolution result (Gioia et al.; Henry ct al.), which was obtained using a completely independent cluster sample. The low-L-X results are in agreement with other ROSAT surveys (e.g., Rosati et al.; Jones et al.). We also compare the distribution of core radii of nearby and distant (z > 0.4) luminous (with equivalent temperatures of 4-7 keV) clusters and detect no evolution. The ratio of average core radius for z similar to 0.5 and z < 0.1 clusters is 0.9 +/- 0.1, and the core radius distributions are remarkably similar. A decrease of cluster sizes incompatible with our data is predicted by self-similar evolution models for a high-Omega universe.
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97308
dc.identifier.wosidWOS:000073499200006
dc.issue.numero1
dc.language.isoen
dc.pagina.finalL25
dc.pagina.inicioL21
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies, clusters, general
dc.subjectsurveys
dc.subjectX-rays, galaxies
dc.titleEvolution of cluster X-ray luminosities and radii: Results from the 160 square degree rosat survey
dc.typeartículo
dc.volumen498
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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