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.
The thermal history of the intergalactic medium
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
At redshifts z >~ 2, most of the baryons reside in the smooth intergalactic medium which is responsible for the low column density Lyman-alpha forest. This photoheated gas follows a tight temperature-density relation which introduces a cut-off in the distribution of widths of the Lyman-alpha absorption lines (b-parameters) as a function of column density. We have measured this cut-off in a sample of nine high resolution, high signal-to-noise quasar spectra, and determined the thermal evolution of the intergalactic medium in the redshift range 2.0-4.5. At redshift z ~ 3, the temperature at the mean density shows a peak and the gas becomes nearly isothermal. We interpret this as evidence for the reionization of HeII.
citation-role summary
background 1
citation-polarity summary
fields
astro-ph.CO 1years
2025 1verdicts
CONDITIONAL 1roles
background 1polarities
background 1representative citing papers
citing papers explorer
-
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.