Studying 21cm power spectrum with one-point statistics
arXiv:1412.3332 · doi:10.1093/mnras/stv965
Abstract
The redshifted 21cm line signal from neutral hydrogens is a promising tool to probe the cosmic dawn and the epoch of reionization (EoR). Ongoing and future low-frequency radio experiments are expected to detect its fluctuations, especially through the power spectrum. In this paper, we give a physical interpretation of the time evolution of the power spectrum of the 21cm brightness temperature fluctuations, which can be decomposed into dark matter density, spin temperature and neutral fraction of hydrogen fluctuations. From the one-point statistics of the fluctuations, such as variance and skewness, we find that the peaks and dips in the time evolution are deeply related to X-ray heating of the intergalactic gas, which controls the spin temperature. We suggest the skewness of the brightness temperature distribution is a key observable to identify the onset of X-ray heating.
8 pages, 8 figures. Published in MNRAS
References in corpus (17)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
- Observational constraints on Cosmic Reionization
- Efficient Simulations of Early Structure Formation and Reionization
- How accurately can 21 cm tomography constrain cosmology?
- 21 cm fluctuations from inhomogeneous X-ray heating before reionization
- Foreground simulations for the LOFAR - Epoch of Reionization Experiment
- Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
- 21 cm signal from cosmic dawn: Imprints of spin temperature fluctuations and peculiar velocities
- Cosmic Reionization and the 21-cm signal: Comparison between an analytical model and a simulation
- The bispectrum of redshifted 21-cm fluctuations from the dark ages
- Multi-redshift limits on the 21cm power spectrum from PAPER
- Higher Order Contributions to the 21 cm Power Spectrum
- Detection and extraction of signals from the epoch of reionization using higher order one-point statistics
- The trispectrum of 21-cm background anisotropies as a probe of primordial non-Gaussianity
- The Difference PDF of 21-cm Fluctuations: A Powerful Statistical Tool for Probing Cosmic Reionization
- Probing the first galaxies with the SKA
Cited by in corpus (9)
- Insights from probability distribution functions of intensity maps
- Sensitivity for 21cm Bispectrum from Epoch of Reionization
- Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
- Redshifted 21-cm bispectrum II: Impact of the spin temperature fluctuations and redshift space distortions on the signal from the Cosmic Dawn
- Deconvolving the Wedge: Maximum-Likelihood Power Spectra via Spherical-Wave Visibility Modeling
- The Epoch of Reionization 21-cm Bispectrum: The impact of light-cone effects and detectability
- Redshifted 21-cm bispectrum: Impact of the source models on the signal and the IGM physics from the Cosmic Dawn
- Studying neutral hydrogen structures during the epoch of reionization using fractal dimensions
- The variance of dispersion measure of high-redshift transient objects as a probe of ionized bubble size during reionization