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Article Contents

ABSTRACT

1.INTRODUCTION

2.INSTRUMENTAL ISSUES

2.1.The Extreme Ultraviolet Explorer (EUVE) satellite

2.2.ROSAT PSPC

2.3.XMM-Newton EPIC

2.4.Chandra

2.5.Suzaku XIS

3.SOFT X-RAY EXCESS EMISSION BASED ON EUVE AND ROSAT PSPC DATA

3.1.The first objects with a soft X-ray excess discovered: Virgo (redshift z = 0.0038) and Coma (z = 0.0231)

3.2.Other clusters observed with EUVE and ROSAT

4.SOFT X-RAY EMISSION BASED ON XMM-NEWTON EPIC DATA

4.1.Continuum detections

4.2.Line emission detection

5.SOFT X-RAY EMISSION BASED ON SUZAKU OBSERVATIONS

5.1.Search for the soft excess in and around clusters

5.2.Abell 2218 (z = 0.1756)

5.3.Abell 2052

5.4.Other clusters

6.SOFT X-RAY EMISSION BASED ON CHANDRA OBSERVATIONS

7.DISCUSSION

7.1.Thermal models

7.2.Non-thermal models

7.3.Some problems and open questions

8.NOTE ADDED IN PROOF

9.CONCLUSIONS

REFERENCES