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Astron. Astrophys. 353, 498-506 (2000)

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6. Summary and conclusions

We have presented and discussed Beppo SAX observations of two high redshift clusters of galaxies: MS 2053.7-0449 at [FORMULA] and RXJ 0152.7-1357 at [FORMULA].

The first object has been selected from the EMSS sample. No constraints on the metallicity can be derived from the present data; by fixing the abundance to 0.3 solar we measure a gas temperature with very high uncertainty ([FORMULA] keV).

The second cluster has been selected from the RDCS sample and is one of the most X-ray luminous system known at [FORMULA]. It is characterized by a complex morphology (both in the optical and soft X-ray) with at least two cores, a gas temperature of [FORMULA] keV and a metallicity of [FORMULA] (68% confidence interval). A prominent iron [FORMULA] line is clearly visible in the MECS spectrum.

In light of this new cluster temperature measurement at [FORMULA], we have discussed the high redshift ([FORMULA]) [FORMULA] relationship and we have found that the limited data available so far can easily be accommodated with a non-evolving (or mildly evolving) [FORMULA] relation. This result, when combined with the little observed evolution in the X-ray cluster abundance, gives support to cosmological models with a low density parameter (e.g. Borgani et al., 1999).

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© European Southern Observatory (ESO) 2000

Online publication: December 17, 1999