Ray-tracing log-normal simulation for weak gravitational lensing: application to the cross-correlation with galaxies
Abstract
We present an algorithm to self-consistently generate mock weak gravitational lensing convergence fields and galaxy distributions in redshift space. We generate three-dimensional cosmic density fields that follow a log-normal distribution, and ray-trace them to produce convergence maps. As we generate the galaxy distribution from the same density fields in a manner consistent with ray-tracing, the galaxy-convergence cross-power spectrum measured from the mock agrees with the theoretical expectation with high precision. We use this simulation to forecast the quality of galaxy-shear cross-correlation measurements from the Subaru Hyper Suprime-Cam (HSC) and Prime Focus Spectrograph (PFS) surveys. We find that the nominal HSC and PFS surveys would detect the cross power spectra with signal-to-noise ratios of 20 and 5 at the lowest (z = 0.7) and highest (z = 2.2) redshift bins, respectively.
- Publication:
-
Journal of Cosmology and Astroparticle Physics
- Pub Date:
- March 2021
- DOI:
- 10.1088/1475-7516/2021/03/095
- arXiv:
- arXiv:2008.13195
- Bibcode:
- 2021JCAP...03..095M
- Keywords:
-
- cosmological simulations;
- galaxy clustering;
- weak gravitational lensing;
- redshift surveys;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 22 pages, 10 figures, accepted to JCAP. The simulation code is available at https://wwwmpa.mpa-garching.mpg.de/~komatsu/codes.html