Abstract
Results from the <em>Suzaku</em> X-ray broad-band observations of clusters of galaxies are summarized. Aiming at understanding the physics of gas heating/particle acceleration and the cluster dynamical evolution, we search for non-thermal hard X-ray emission from merging clusters, particularly A2163 and the Bullet Cluster, based on the <em>Suzaku</em> and <em>XMM-Newton/Chandra</em> joint analyses. The observed hard X-ray emission is well represented by single- or multi-temperature thermal models, including super-hot (kT ~ 20 keV) gas. However, no significant non-thermal hard X-ray emission has been detected. Together with the presently available literature, the hard X-ray properties have been studied for about 10 clusters with <em>Suzaku</em>. The present status on <em>Suzaku</em> measurements of non-thermal X-ray emission and the cluster magnetic field are summarized and compared with those from the <em>RXTE, BeppoSAX</em>, and <em>Swift</em> satellites. The future prospects are briefly mentioned.
Highlights
According to the standard scenario of the structure formation in the Universe, clusters form via collisions and mergers of smaller groups and clusters
We search for non-thermal hard X-ray emission from merging clusters using Suzaku broad-band X-ray spectroscopy to reveal the origin of hard X-ray emission and obtain new insight into the gas physics and the cluster dynamical evolution
We focus on X-ray bright sources with radio synchrotron halos, A2163 at z = 0.203, and the Bullet Cluster at z = 0.296, since they are considered to have undergone a recent, violent merger
Summary
According to the standard scenario of the structure formation in the Universe, clusters form via collisions and mergers of smaller groups and clusters. A cluster merger has a kinetic energy of the order of 1065 erg. A cluster merger has a kinetic energy of the order of 1065 erg This is the most energetic event in the Universe since the Big Bang. If two such objects collide with each other, a huge amount of energy may be released and a certain fraction is expected to heat the gas and accelerate particles through shock waves, and induce bulk and turbulent gas motions. Synchrotron emission extending over a Mpc scale have been discovered from more than 30 clusters [12]. From the observational point of view, a direct link between the radio synchrotron halo and the non-thermal hard X-ray property is yet to be clarified
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call