Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: 
Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations

Wei, Chengliang; Li, Guoliang; Kang, Xi; Luo, Yu; Xia, Qianli; Wang, Peng; Yang, Xiaohu; Wang, Huiyuan; Jing, Yipeng; Mo, Houjun; Lin, Weipeng; Wang, Yang; Li, Shijie; Lu, Yi; Zhang, Youcai; Lim, S. H.; Tweed, Dylan; Cui, Weiguang

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations

MPS-Authors

Wei, Chengliang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li, Guoliang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kang, Xi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Luo, Yu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Xia, Qianli
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang, Peng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yang, Xiaohu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang, Huiyuan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jing, Yipeng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mo, Houjun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lin, Weipeng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang, Yang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li, Shijie
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lu, Yi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang, Youcai
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lim, S. H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tweed, Dylan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cui, Weiguang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...853...25W
(Any fulltext)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Wei, C., Li, G., Kang, X., Luo, Y., Xia, Q., Wang, P., et al. (2018). Full-sky Ray-tracing Simulation of Weak Lensing Using ELUCID Simulations: Exploring Galaxy Intrinsic Alignment and Cosmic Shear Correlations. The Astrophysical Journal, 853.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CA4E-1

Abstract

The intrinsic alignment of galaxies is an important systematic effect in weak-lensing surveys, which can affect the derived cosmological parameters. One direct way to distinguish different alignment models and quantify their effects on the measurement is to produce mock weak- lensing surveys. In this work, we use the full-sky ray-tracing technique to produce mock images of galaxies from the ELUCID N-body simulation run with WMAP9 cosmology. In our model, we assume that the shape of the central elliptical galaxy follows that of the dark matter halo, and that of the spiral galaxy follows the halo spin. Using the mock galaxy images, a combination of galaxy intrinsic shape and the gravitational shear, we compare the predicted tomographic shear correlations to the results of the Kilo-Degree Survey (KiDS) and Deep Lens Survey (DLS). We find that our predictions stay between the KiDS and DLS results. We rule out a model in which the satellite galaxies are radially aligned with the center galaxy; otherwise, the shear correlations on small scales are too high. Most importantly, we find that although the intrinsic alignment of spiral galaxies is very weak, they induce a positive correlation between the gravitational shear signal and the intrinsic galaxy orientation (GI). This is because the spiral galaxy is tangentially aligned with the nearby large-scale overdensity, contrary to the radial alignment of the elliptical galaxy. Our results explain the origin of the detected positive GI term in the weak-lensing surveys. We conclude that in future analyses, the GI model must include the dependence on galaxy types in more detail.