  We performed five pointing observations with Suzaku to search for hot gases
associated with the junctions of galaxy filaments where no significant diffuse
X-ray sources were detected so far. We discovered X-ray sources successfully in
all five regions and analyzed two bright sources in each field. Spectral
analysis indicates that three sources originate from X-ray diffuse halos
associated with optically bright galaxies or groups of galaxies with kT~0.6-0.8
keV. Other three sources are possibly group- and cluster-scale X-ray halos with
temperatures of ~1 keV and ~4 keV, respectively while the others are compact
object origins such as AGNs. All the three observed intracluster media within
the junctions of the galaxy filaments previously found are involved in ongoing
mergers. Thus, we demonstrate that deep X-ray observations at the filament
junctions identified by galaxy surveys are a powerful mean to explore growing
halos in a hierarchical structure undetected so far.
