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We performed five pointing observations with Suzaku to search for hot gasesassociated with the junctions of galaxy filaments where no significant diffuseX-ray sources were detected so far. We discovered X-ray sources successfully inall five regions and analyzed two bright sources in each field. Spectralanalysis indicates that three sources originate from X-ray diffuse halosassociated with optically bright galaxies or groups of galaxies with kT~0.6-0.8keV. Other three sources are possibly group- and cluster-scale X-ray halos withtemperatures of ~1 keV and ~4 keV, respectively while the others are compactobject origins such as AGNs. All the three observed intracluster media withinthe junctions of the galaxy filaments previously found are involved in ongoingmergers. Thus, we demonstrate that deep X-ray observations at the filamentjunctions identified by galaxy surveys are a powerful mean to explore growinghalos in a hierarchical structure undetected so far.

Exploring Hot Gas at Junctions of Galaxy Filaments with Suzaku