1709.02543
The first detection of the imprint of filaments on CMB lensing
He, Alam, Ferraro, Chen, Ho
Galaxy redshift surveys, such as 2dF, SDSS, 6df, GAMA and VIPERS, have shown that the spatial distribution of matter formed a hierarchical structure consisting of clusters, filaments, sheets and voids. This hierarchical structure is known as the cosmic web. The majority of galaxy survey analyses measure the 2pt correlation, but ignoring the information beyond a small number of summary statistics. Since the matter density field becomes highly non-Gaussian as structures evolve, expect other statistical descriptions of the field to provide with additional information. One way to study the non-Gaussianity is to study filaments, which evolve non-linearly from the initial density fluctuation. Several previous works have studied the gravitational lensing of filaments to detect filaments and learn their mass profile. In this study, provide the first detection of CMB lensed by filaments and measure how filaments trace the matter distribution on large scales. More specifically, assume that, on large scales, filaments trace matter with a constant filament bias, defined as the ratio between the filament overdensity and the mass overdensity. Propose a phenomenological model for the cross power spectrum between filaments and the CMB lensing convergence field. By fitting the model to the data, measure filament bias.
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