Year: 2021
Type: article
Abstract: ABSTRACT We demonstrate the utility and constraining power of a new statistic for investigating galaxy bias: the galaxy-lensing phase difference. The statistic consists in taking the differences of the phases of the harmonic wave modes between the weak lensing convergence field and the galaxy count field. We use dark matter simulations populated with galaxies up to redshift z = 1 to test the performance of this estimator. We find that phase differences are sensitive to the absolute value of the second-order bias (c2 = b2/b1) and demonstrate why this is the case. For a $1500$ deg2 galaxy survey we recover c2 with an error of approximately 0.1 for a wide range of c2 values; current constraints from redshift surveys have errors of 0.1–0.6 depending on redshift. This new statistic is therefore expected to provide constraints for c2 which are complementary and competitive with constraining power by the conventional estimators from the power spectrum and bispectrum. For the Dark Energy Survey (DES), we predict leading measurements of second-order bias.
Authors: Marc Manera, David Bacon
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Department for Business, Energy and Industrial Strategy, UK Government, Durham University, Universitat Autònoma de Barcelona, Horizon 2020 Framework Programme, Science and Technology Facilities Council, European Regional Development Fund, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
Awards: G1140343831, Durham DiRAC-2 petascale facility, DiRAC-2.5 - the pathway to DiRAC Phase 3, G2502495750, G2724489712, G3007212846, G3403823835, Cosmology, Gravitation and Astrophysics at Portsmouth, DiRAC-2.5 DC - Operations 2017-2020, G6537386148, G6873874887, DiRAC: Memory Intensive 2.5y, G8986044568, DiRAC: Memory Intensive 2.5x
OpenAlex ID: W3083533142