Journal of The Korean Astronomical Society (천문학회지)

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X-RAY EMISSION FROM THE WARM-HOT INTERGALACTIC MEDIUM

  • KAASTRA JELLE S. (SRON, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands)
  • Published : 2004.12.01
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Abstract

In this paper I give an overview of the detection of emission from the warm-hot intergalactic medium (WHIM) in the outer parts of clusters of galaxies. The evidence for the presence of soft excess X-ray emission in 7 out of 21 clusters is summarized, and it is demonstrated that several of these clusters show the signatures of thermal emission in the outer parts. A strong signature is the presence of redshifted O VII emission at 0.57 keV. In the central parts, several clusters show also a soft excess, but m this case the observations cannot well discriminate between a thermal or non-thermal origin of the soft X-ray excess.

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References

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