학술논문
Superclustering with the Atacama Cosmology Telescope and Dark Energy Survey. I. Evidence for Thermal Energy Anisotropy Using Oriented Stacking
Document Type
Report
Author
M. Lokken; R. Hložek; A. van Engelen; M. Madhavacheril; E. Baxter; J. DeRose; C. Doux; S. Pandey; E. S. Rykoff; G. Stein; C. To; T. M. C. Abbott; S. Adhikari; M. Aguena; S. Allam; F. Andrade-Oliveira; J. Annis; N. Battaglia; G. M. Bernstein; E. Bertin; J. R. Bond; D. Brooks; E. Calabrese; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; R. Cawthon; A. Choi; M. Costanzi; M. Crocce; L. N. da Costa; M. E. da Silva Pereira; J. De Vicente; S. Desai; J. P. Dietrich; J. Dunkley; S. Ferraro; P. A. Gallardo; E. J. Wollack
Source
The Astrophysical Journal. 933(2)
Subject
Language
English
ISSN
1538-4357
0004-637X
0004-637X
Abstract
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 thermal Sunyaev–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). Cutout 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 of microwave and optical surveys.