The Atacama Cosmology Telescope: A census of bridges between galaxy clusters
G. Isopi, V. Capalbo, A. D. Hincks, L. Di Mascolo, E. Barbavara, E. S. Battistelli, J. R. Bond, W. Cui, W. R. Coulton, M. De Petris, M. Devlin, K. Dolag, J. Dunkley, D. Fabjan, A. Ferragamo, A. S. Gill, Y. Guan, M. Halpern, M. Hilton, J. P. Hughes, M. Lokken, J. van Marrewijk

TL;DR
This study uses the Atacama Cosmology Telescope to detect and analyze hot gas in filaments connecting galaxy clusters via the thermal Sunyaev-Zeldovich effect, providing new insights into the cosmic web and missing baryons.
Contribution
First direct measurement of hot inter-cluster gas in galaxy filaments at moderate redshift using tSZ effect, with candidate identification and stacking analysis.
Findings
Detected inter-cluster tSZ signal with >3σ significance.
Identified candidate cluster pairs with potential intercluster bridges.
Results broadly consistent with cosmological simulations and filament scaling relations.
Abstract
According to CMB measurements, baryonic matter constitutes about of the mass-energy density of the universe. A significant population of these baryons, for a long time referred to as `missing', resides in a low density, warm-hot intergalactic medium (WHIM) outside galaxy clusters, tracing the ``cosmic web'', a network of large scale dark matter filaments. Various studies have detected this inter-cluster gas, both by stacking and by observing individual filaments in compact, massive systems. In this paper, we study short filaments (< 10 Mpc) connecting massive clusters () detected by the Atacama Cosmology Telescope (ACT) using the scattering of CMB light off the ionised gas, a phenomenon known as the thermal Sunyaev-Zeldovich (tSZ) effect. The first part of this work is a search for suitable candidates for high resolution follow-up tSZ…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Scientific Research and Discoveries
