The cosmic infrared background (CIB) is the accumulated infrared radiation mainly generated from dust emissions in star-forming galaxies. It bears rich information about star formation history, dust thermodynamics, and galaxy abundance in the distant Universe. The CIB auto- and cross-correlations with other large-scale structure (LSS) tracers have been used to probe the star formation, dust, and abundance of galaxies. In this talk, I will present our recent works (https://arxiv.org/abs/2204.01649,
https://arxiv.org/abs/2310.10848) on constraining cosmic star formation history, dust spectral energy distribution (SED), and halo occupation (HOD) model with CIB-galaxy cross-correlations. With the galaxy data from KiDS and unWISE catalogs, we measured very significant (43\sigma with KiDS and 194\sigma with unWISE) cross-correlation signals and made informative constraints on star formation, dust SED, and galaxy HOD. I will also present a forecast on CIB cross-correlations with data from future galaxy surveys. This study, together with related studies, has shown that 1) CIB is a powerful tool to explore the aforementioned topics, and 2) CIB x LSS are generally consistent with IR flux-based studies. We conclude that our understanding of stars, dust, and galaxy abundance from different observations is reaching a converged picture. Future datasets from CSST, LSST, Euclid, CMB-S4, etc will yield more precise CIB cross-correlations, thus we will need to improve the CIB models to yield more accurate and comprehensive constraints.
BIO
I am a postdoctoral fellow at the German Centre for Cosmological Lensing based at Ruhr-University Bochum. Before joining GCCL, I did my undergrad at the Department of Physics at Tsinghua University until 2015. Then I did my PhD in physics at the Department of Physics and Astronomy, University of British Columbia until 2021. I'm a member of the Kilo-degree Survey, Canada-France Imaging Survey, and Dark Energy Science Collaboration. My research interests include studying the Universe by cross-analyzing large-scale structure tracers and developing analysis tools for future cosmological surveys. For more detailed information please check my personal website:
https://yanzastro.github.io/
