Über den Autor
Jelle Kaastra studied astrophysics at Utrecht University. He obtained his Ph.D. in astronomy in 1985 with a thesis on Solar flares. After that he joined the Netherlands Institute for Space Research SRON, first in Leiden, and from 1994 in Utrecht, where he currently is employed as a senior scientist. He is an expert on high-resolution X-ray spectroscopy and currently works on a variety of topics in this field, including clusters of galaxies.
Clusters of Galaxies: Beyond the Thermal View.- Clusters of Galaxies: Setting the Stage.- FUV and X-Ray Absorption in the Warm-Hot Intergalactic Medium.- Soft X-Ray and Extreme Ultraviolet Excess Emission from Clusters of Galaxies.- Nonthermal Phenomena in Clusters of Galaxies.- Observations of Extended Radio Emission in Clusters.- Cosmological Shock Waves.- Equilibration Processes in the Warm-Hot Intergalactic Medium.- Thermal Radiation Processes.- Nonthermal Radiation Mechanisms.
The existence of soft excess emission originating from clusters of galaxies, de ned as em- sion detected below 1 keV in excess over the usual thermal emission from hot intracluster gas (hereafter the ICM) has been claimed since 1996. Soft excesses are particularly - portant to detect because they may (at least partly) be due to thermal emission from the Warm-Hot Intergalactic Medium, where as much as half of the baryons of the Universe could be. They are therefore of fundamental cosmological importance. Soft excess emission has been observed (and has also given rise to controversy) in a number of clusters, mainly raising the following questions: (1) Do clusters really show a soft excess? (2) If so, from what spatial region(s) of the cluster does the soft excess or- inate? (3) Is this excess emission thermal, originating from warm-hot intergalactic gas (at 6 temperatures of?10 K), or non-thermal, in which case several emission mechanisms have been proposed. Interestingly, some of the non-thermal mechanisms suggested to account for soft excess emission can also explain the hard X-ray emission detected in some clusters, for example by RXTE and BeppoSAX (also see Petrosian et al. 2008-Chap. 10, this issue; Rephaeli et al. 2008-Chap. 5, this issue).
Focuses on the warm-hot intergalactic medium and non-thermal aspects of clusters
Contains a tutorial review about these topics
Takes an approach from observational, theoretical, and numerical modeling points of view