Superclustering with the Atacama Cosmology Telescope and Dark Energy Survey: I. evidence for thermal energy Anisotropy using oriented stacking
Superclustering with the Atacama Cosmology Telescope and Dark Energy Survey: I. evidence for thermal energy Anisotropy using oriented stacking
The cosmic web contains filamentary structure on a wide range of scales. On the largest scales, superclustering aligns multiple galaxy clusters along intercluster bridges, visible through their thermalSunyaev-Zel'dovich signal in the cosmic microwave background. We demonstrate a new, flexible method to analyze the hot gas signal from multiscale extended structures. We use a Compton y-map from the Atacama Cosmology Telescope (ACT) stacked on redMaPPer cluster positions from the optical Dark Energy Survey (DES). Cut out images from the y-map are oriented with large-scale structure information from DES galaxy data such that the superclustering signal is aligned before being overlaid. We find evidence of an extended quadrupole moment of the stacked y signal at the 3.5σ level, demonstrating that the large-scale thermal energy surrounding galaxy clusters is anisotropically distributed. We compare our ACT × DES results with the Buzzard simulations, finding broad agreement. Using simulations, we highlight the promise of this novel technique for constraining the evolution of anisotropic, non-Gaussian structure using future combinations ofmicrowave and optical surveys.
1654, 1657, 330, 343, 584, 811, 902, Cosmic web, Cosmology, Galaxy clusters, Intergalactic filaments, Large-scale structure of the universe, Sunyaev-Zeldovich effect, Superclusters
Lokken, M.
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Hložek, R.
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Engelen, A. van
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Madhavacheril, M.
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Baxter, E.
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DeRose, J.
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Doux, C.
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Pandey, S.
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Stein, G.
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Abbott, T. M. C.
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Brooks, D.
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Lokken, M.
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Hložek, R.
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Rykoff, E. S.
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