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The Cross-Correlation of High-Redshift 21 cm and Galaxy Surveys
Steven Furlanetto, Adam Lidz
We study the detectability of the cross-correlation between 21 cm emission from the intergalactic medium and the galaxy distribution during (and before) reionization. We show that…
Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
Steven Furlanetto, S. Peng Oh, Frank Briggs
Observations of the high-redshift Universe with the 21 cm hyperfine line of neutral hydrogen promise to open an entirely new window onto the early phases of cosmic structure format…
The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
Steven Furlanetto, S. Peng Oh, Elena Pierpaoli
The radiation background produced by the 21 cm spin-flip transition of neutral hydrogen at high redshifts can be a pristine probe of fundamental physics and cosmology. At z~30-300,…
Spin Exchange Rates in Electron-Hydrogen Collisions
Steven Furlanetto, Michael Furlanetto
The spin temperature of neutral hydrogen, which determines the 21 cm optical depth and brightness temperature, is set by the competition between radiative and collisional processes…
21 cm fluctuations from inhomogeneous X-ray heating before reionization
Jonathan R. Pritchard, Steven R. Furlanetto
Many models of early structure formation predict a period of heating immediately preceding reionization, when X-rays raise the gas temperature above that of the cosmic microwave ba…
The Scattering of Lyman-series Photons in the Intergalactic Medium
Steven Furlanetto, Jonathan R. Pritchard
We re-examine scattering of photons near the Lyman-alpha resonance in the intergalactic medium (IGM). We first derive a general integral solution for the radiation field around res…