Astrophysics Seminar
Simulation Framework for Power Spectrum Analysis in HI Intensity Mapping with CHIME
Speaker: Dr. Shabbir Shaikh (Arizona State University)
Neutral hydrogen (HI) intensity mapping is an emerging technique to trace the large-scale structure of the Universe by measuring the integrated 21 cm emission from unresolved sources. The Canadian Hydrogen Intensity Mapping Experiment (CHIME) targets 21 cm emission from redshifts between 0.8 and 2.5, offering new opportunities to probe cosmic expansion and the growth of structure.
In this talk, I will provide a brief introduction to the principles of HI intensity mapping and the CHIME instrument before focusing on our simulation framework designed to model and interpret CHIME's HI power spectrum measurements. I will describe the method for generating HI maps corresponding to CHIME's frequency channels and for incorporating instrumental effects into power spectrum modeling. These simulations play a critical role in validating the analysis pipeline and improving the robustness of cosmological parameter inference.