Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-10
Astronomy and Astrophysics
Astrophysics
5 pages including 3 ps figures, uses enclosed emulateapj.sty. ApJ Letters, in press
Scientific paper
We searched for cluster X-ray luminosity and radius evolution using our sample of 200 galaxy clusters detected in the 160 deg^2 survey with the ROSAT PSPC (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 of luminous clusters, Lx > 3x10^44 erg/s, in the 0.5-2 keV band. We detect a factor of 3-4 deficit of such luminous clusters at z>0.3 compared to the present. 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 the analysis of the log N - log S relation. The results in the two upper Lx bins are in agreement with the Einstein EMSS evolution result (Gioia et al. 1990a, Henry et al. 1992) while being obtained using a completely independent cluster sample. 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 no evolution. The ratio of average core radius for z~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 high-Omega universe.
Forman William
Hornstrup Allan
Jones Christine
McNamara Brian R.
Quintana Hernan
No associations
LandOfFree
Evolution of Cluster X-Ray Luminosities and Radii: Results from the 160 Square Degree ROSAT Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolution of Cluster X-Ray Luminosities and Radii: Results from the 160 Square Degree ROSAT Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of Cluster X-Ray Luminosities and Radii: Results from the 160 Square Degree ROSAT Survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-403281