The Atacama Cosmology Telescope: a census of bridges between galaxy clusters

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dc.creatorIsopi, G.
dc.creatorCapalbo, V.
dc.creatorHincks, A.D.
dc.creatorDi Mascolo, L.
dc.creatorBarbavara, E.
dc.creatorBattistelli, E.S.
dc.creatorBond, J.R.
dc.creatorCui, W.
dc.creatorCoulton, W.R.
dc.creatorDe Petris, M.
dc.creatorDevlin, M.
dc.creatorDolag, K.
dc.creatorDunkley, J.
dc.creatorFabjan, D.
dc.creatorFerragamo, A.
dc.creatorGill, A.S.
dc.creatorGuan, Y.
dc.creatorHalpern, M.
dc.creatorHilton, M.
dc.creatorHughes, J.P.
dc.creatorLokken, M.
dc.creatorvan Marrewijk, J.
dc.creatorMoodley, K.
dc.creatorMroczkowski, T.
dc.creatorOrlowski-Scherer, J.
dc.creatorRasia, E.
dc.creatorSantoni, S.
dc.creatorSifón, C.
dc.creatorWollack, E.J.
dc.creatorYepes, G.
dc.date2025-08-26T13:21:52Z
dc.date2025-08-26
dc.date2024-10-22
dc.date2025-08-26T13:21:51Z
dc.date.accessioned2026-08-03T01:52:19Z
dc.descriptionAccording to cosmic microwave background (CMB) measurements, baryonic matter constitutes about 5% 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 (〈M 500〉 ≈ 3 × 1014 M⊙) 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 observations. We identify four cluster pairs with an intercluster signal above the noise floor (S/N > 2), including two with a tentative > 2σ statistical significance for an intercluster bridge from the ACT data alone. In the second part of this work, starting from the same cluster sample, we directly stack on ∼100 cluster pairs and observe an excess SZ signal between the stacked clusters of y = (7.2+2.3 -2.5) × 10-7 with a significance of 3.3σ. It is the first tSZ measurement of hot gas between clusters in this range of masses at moderate redshift (〈z〉 ≈ 0.5). We compare this to the signal from simulated cluster pairs with similar redshifts and separations in the THE300 and MAGNETICUM Pathfinder cosmological simulations and find broad consistency. Additionally, we show that our measurement is consistent with scaling relations between filament parameters and mass of the embedded halos identified in simulations.
dc.formattext/xml
dc.formatapplication/pdf
dc.identifieradefd0
dc.identifieradefd0
dc.identifierjcap_089p_1024
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/388691
dc.identifier1475-7516
dc.identifier.urihttps://repo.dare.co.zw/handle/123456789/160772
dc.languageen
dc.publisherIOP Publishing
dc.subjectcosmic web
dc.subjectcosmological simulations
dc.subjectSunyaev-Zeldovich effect
dc.subjectgalaxy clusters
dc.titleThe Atacama Cosmology Telescope: a census of bridges between galaxy clusters
dc.typeArticle

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