@article{oai:ir.soken.ac.jp:00004255,
 author = {池内, 了 and IKEUCHI, Satoru and HIRAYAMA, Yuzo},
 issue = {3},
 journal = {Progress of Theoretical Physics, Progress of Theoretical Physics},
 month = {},
 note = {Possible detections of X-ray from the intercluster space or a supercluster are reported. Supposing this X-ray is thermal in origin, we study the collapse of primordial gas and the formation of hot gas at the intercluster space between two clusters of galaxies. 

As for the initial distribution of primordial gas, two models are considered corresponding to two alternative standpoints, that is, the supercluster is an accidental aggregate of clusters or a physical one. The first model is that two clusters are independent and the primordial gas remained after cluster formation distributes in a cluster size and accretes to individual clusters. In this case, the hot intercluster gas is formed by the collision of expanding gas flow from each cluster and X-ray emission from the intercluster space is expected. The other model is that the primordial gas distributes over the scale of a supercluster. The hot gas region after collapse is almost restricted within each cluster, and the X-ray luminosity increases with gas accumulation continuing over the cosmic time. 

Considering these results, we discuss the possible superclustering in relation to the (future) observations of X-ray morphology.},
 pages = {881--894},
 title = {Infall of Matter and X-ray Emission from Superclusters},
 volume = {61},
 year = {1979}
}