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Probing helium reionization with kinetic Sunyaev Zel'dovich tomography
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abstract
Reionization of helium is expected to occur at redshifts $z\sim3$ and have important consequences for quasar populations, galaxy formation, and the morphology of the intergalactic medium, but there is little known empirically about the process. Here we show that kinetic Sunyaev-Zeldovich (kSZ) tomography, based on the combination of CMB measurements and galaxy surveys, can be used to infer the primordial helium abundance as well as the time and duration of helium reionization. We find a high-significance detection at ${\sim10\sigma}$ can be expected from Vera Rubin Observatory and CMB-S4 in the near future. A more robust characterization of helium reionization will require next-generation experiments like MegaMapper (a proposed successor to DESI) and CMB-HD.
Forward citations
Cited by 2 Pith papers
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Patchy Helium and Hydrogen Reionization from the Kinetic Sunyaev-Zel'dovich Effect and Galaxies
Forecasts show that cross-correlating kSZ temperature-squared maps with galaxy-reconstructed velocity-squared maps can jointly constrain hydrogen and helium reionization, making helium measurable with CMB-HD and MegaMapper.
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Neutrino Mass Constraints from kSZ Tomography
kSZ tomography will add little to neutrino mass constraints from Stage IV surveys unless the kSZ optical depth degeneracy is broken.
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