Speaker
Description
For years, pairs of clusters have been studied in a wide range of frequencies to try to detect filaments of matter between them using. X-ray emission, the Sunyaev-Zel'dovich (SZ) effect and radio emission have all been used. Such studies are closely connected to the ‘missing baryon’ problem, an open issue in modern cosmology: the quantity of baryonic matter observed in the local Universe is much smaller than that of the LCDM model. Hydrodynamical simulations of large scale structure show that at low redshifts, these missing baryons should be in the warm-hot intergalactic medium (WHIM), arranged in filaments connecting galaxy clusters, that all together form the cosmic web. The first significant detection of an individual filamentary structure between galaxy clusters with the SZ effect was in the Abell 399 and Abell 401 cluster pair. This triggered a search for filaments in other pairs of galaxy clusters, with a few candidates discovered in SZ maps from the Atacama Cosmology Telescope (ACT). X-ray and SZ observations have always been interlaced for discovering and characterizing galaxy clusters and filaments. We are obtaining XMM-Newton X-ray data and high resolution MUSTANG-2 SZ data for two galaxy cluster pairs in which ACT data show the possible presence of a bridge. We are analyzing these systems by jointly modelling the ACT and MUSTANG-2 SZ measurements together with the XMM-Newton X-ray maps in the energy band between 0.4 and 7.2 keV. This study will help us to better constrain the physical properties of these filaments and to deepen our understanding of the cosmic web.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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