The Jubilee ISW Project I: simulated ISW and weak lensing maps and initial power spectra results

TL;DR

This paper presents simulated maps and initial power spectra results for the ISW effect in a large cosmological simulation, providing insights into the redshift dependence and cross-correlation with LRGs.

Contribution

It introduces a large-volume simulation modeling the ISW effect with mock LRG catalogues and analyzes the redshift and angular dependence of the ISW-LRG cross-correlation.

Findings

ISW effect grows stronger at late times.

Optimal redshift for ISW detection varies with angular scale.

Maps of lensing and ISW effects are consistent with theoretical expectations.

Abstract

We present initial results from the Jubilee ISW project, which models the expected \LambdaCDM Integrated Sachs-Wolfe (ISW) effect in the Jubilee simulation. The simulation volume is (6 Gpc/h)^3, allowing power on very large-scales to be incorporated into the calculation. Haloes are resolved down to a mass of 1.5x10^12 M_sun/h, which allows us to derive a catalogue of mock Luminous Red Galaxies (LRGs) for cross-correlation analysis with the ISW signal. We find the ISW effect observed on a projected sky to grow stronger at late times with the evolution of the ISW power spectrum matching expectations from linear theory. Maps of the gravitational lensing effect, including the convergence and deflection fields, are calculated using the same potential as for the ISW. We calculate the redshift dependence of the ISW-LRG cross-correlation signal for a full sky survey with no noise considerations. For l < 30, the signal is strongest for lower redshift bins (z ~ 0.2 to 0.5), whereas for l > 30 the signal is best observed with surveys covering z ~ 0.6-1.0.