The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction
Abstract
We discuss the possibility of studying diffuse baryon distributions with kinematic Sunyaev-Zel'dovich (kSZ) effect by correlating cosmic microwave background (CMB) temperature fluctuations with density fluctuations from 21\,cm intensity mapping (IM). The biggest challenge for the cross-correlation is the loss of large-scale information in IM, due to foregrounds and the zero spacing problem of interferometers. We apply the tidal reconstruction algorithm to restore the lost large-scale modes, which increases the correlation by more than a factor of three. With the predicted foreground level, we expect a 20\,σ detection of kSZ signal for 0.8 z2.5 with CHIME and Planck, and a 40\, σ detection with HIRAX and Planck. The significance can be greatly increased with next-generation facilities of higher spatial resolutions.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.