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The 21-cm Line as a Probe of Reionization
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One of the most exciting probes of the early phases of structure formation and reionization is the spin-flip line of neutral hydrogen, with a rest wavelength of 21 cm. This chapter introduces the physics of this transition and the astrophysical parameters upon which it depends, including discussions of the radiation fields that permeate the intergalactic medium that fix the brightness of this transition. We describe the critical points in the evolution of the 21-cm background and focus on the sky-averaged brightness and the power spectrum as representative measurements. Finally, we include a discussion of observations and the challenges they face in the near future.
Forward citations
Cited by 3 Pith papers
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A New Boundary Condition on Reionization
A zero-lag Pearson correlation between 21-cm and line-intensity maps is predicted to drop sharply at ionized fractions of 1-10%, providing a novel marker for the onset of reionization.
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A 325 MHz uGMRT mosaic of the GAMA-23 field yields a 5741-source catalog, source counts, spectral indices, and angular power spectra of diffuse Galactic synchrotron emission.
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Forecast on $f(R)$ Gravity with HI 21cm Intensity Mapping Surveys
Fisher forecasts show BINGO and SKA1-MID 21-cm intensity mapping, combined with Planck priors, could constrain the f(R) gravity parameter B0 down to ~10⁻⁶–10⁻⁸.
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