Exploring Hot Gas at Junctions of Galaxy Filaments with Suzaku
Résumé
Galaxies are forced to form filamentary structure reflecting the underlying cosmic web of the dark matter. In particular, at junctions of galaxy filaments, one can naturally expect that intense structure formation has high chances to occur. We identified the galaxy filaments by making use of our original method (Sousbie (2011) & Sousbie et al. (2011)) in conjunction with SDSS spectroscopic galaxies. We performed X-ray pointing observations for six fields locating in the junctions of the galaxy filaments where no specific diffuse X-ray emissions had previously been detected so far. We discovered significant X-ray signals in their images and spectra of the all regions compared to a background region. Spectral analysis revealed that six sources originate from diffuse emissions associated with optically bright galaxies, group-scale, or cluster-scale X-ray halos with temperautres of 1-4 keV, while the others are compact object origin. Interestingly, the observed three intracluster media possess peculiar signatures such as complex or elongated morphologies in X-ray and/or optical and hot spot, suggesting that all of the systems are experiencing an ongoing merger (Kawahara et al. (2011) & Mitsuishi et al. (2014)). In this conference, results of follow-up radio observations to search for merger-induced diffuse radio emissions will be reported.