Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-22
Mon.Not.Roy.Astron.Soc. 315 (2000) 669
Astronomy and Astrophysics
Astrophysics
11 pages, 7 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03512.x
We present a measurement of the cluster X-ray luminosity-temperature relation out to high redshift (z~0.8). Combined ROSAT PSPC spectra of 91 galaxy clusters detected in the Wide Angle ROSAT Pointed Survey (WARPS) are simultaneously fit in redshift and luminosity bins. The resulting temperature and luminosity measurements of these bins, which occupy a region of the high redshift L-T relation not previously sampled, are compared to existing measurements at low redshift in order to constrain the evolution of the L-T relation. We find a best fit to low redshift (z<0.2) cluster data, at T>1 keV, to be L proportional to T^(3.15\pm0.06). Our data are consistent with no evolution in the normalisation of the L-T relation up to z~0.8. Combining our results with ASCA measurements taken from the literature, we find eta=0.19\pm0.38 (for Omega_0=1, with 1 sigma errors) where L_Bol is proportional to (1 + z)^eta T^3.15, or eta=0.60\pm0.38 for Omega_0=0.3. This lack of evolution is considered in terms of the entropy-driven evolution of clusters. Further implications for cosmological constraints are also discussed.
Ebeling Harald
Fairley B. W.
Horner Donald
Jones Robert L.
Malkan Matthew
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