Stars and Reionization: The Cross-Correlation of the 21cm Line and the Near Infrared Background
arXiv:1312.3549 · doi:10.1093/mnras/stu261
Abstract
With improving telescopes, it may now be possible to observe the Epoch of Reionization in multiple ways. We examine two of these observables - the excess light in the near-infrared background that may be due to high redshift stars and ionized HII bubbles, and the 21 cm emission from neutral hydrogen. Because these two forms of emission should result from different, mutually exclusive regions, an anticorrelation should exist between them. We discuss the strengths of using cross-correlations between these observations to learn more about high redshift star formation and reionization history. In particular, we create simulated maps of emission from both the near-infrared background and 21 cm emission. We find that these observations are anticorrelated, with the strongest anticorrelation originating from times when the universe is half ionized. This result is robust and does not depend on the properties of the stars themselves. Rather, it depends on the ionization history. Cross-correlations can provide redshift information, which the near-infrared background cannot provide alone. In addition, cross-correlations can help separate foreground emission from the true high redshift component, making it possible to say with greater certainty that we are indeed witnessing the Epoch of Reionization.
10 pages, 9 figures, accepted to MNRAS, minor changes, matches accepted version
References in corpus (14)
- Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
- Simulating Cosmic Reionization at Large Scales II: the 21-cm Emission Features and Statistical Signals
- Self-regulated reionization
- Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array
- The Scale of the Problem : Recovering Images of Reionization with GMCA
- Power spectrum extraction for redshifted 21-cm epoch of reionization experiments: the LOFAR case
- Cosmic Reionization and the 21-cm signal: Comparison between an analytical model and a simulation
- The Effect of Galactic Properties on the Escape Fraction of Ionizing Photons
- On the nature of the sources of the cosmic infrared background
- Background reionization history from omniscopes
- Will Nonlinear Peculiar Velocity and Inhomogeneous Reionization Spoil 21cm Cosmology from the Epoch of Reionization?
- Demonstrating the negligible contribution of optical ACS/HST galaxies to source-subtracted cosmic infrared background fluctuations in deep IRAC/Spitzer images
- Simulating the impact of HI fluctuations on matched filter search for ionized bubbles in redshifted 21 cm maps
- Cross-correlation studies as a probe of reionization physics
Cited by in corpus (17)
- Spectrum and Anisotropy of Turbulence from Multi-Frequency Measurement of Synchrotron Polarization
- Looking at cosmic near-infrared background radiation anisotropies
- Gradients of Synchrotron Polarization: Tracing 3D distribution of magnetic fields
- Large scale simulations of H and He reionization and heating driven by stars and more energetic sources
- On the Physical Requirements for a Pre-Reionization Origin of the Unresolved Near-Infrared Background
- Studying high-z galaxies with [CII] intensity mapping
- Predictions for the 21cm-galaxy cross-power spectrum observable with LOFAR and Subaru
- A new parameterization of the reionisation history
- X-ray background and its correlation with the 21 cm signal
- Probing reionization with the cross power spectrum of 21 cm and near-infrared radiation backgrounds
- Exploring the cosmic dawn and epoch of reionization with 21cm line
- Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys
- Upper Limits on the 21 cm Power Spectrum at z = 5.9 from Quasar Absorption Line Spectroscopy
- Foreground and sensitivity analysis for broad band (2D) 21cm--Ly-alpha and 21cm--H-alpha correlation experiments probing the Epoch of Reionization
- Detecting high- galaxies in the Near Infrared Background
- Revealing the formation histories of the first stars with the cosmic near-infrared background
- Nearest Neighbour-Based Statistics for 21cm-Galaxy Cross-Correlations in the Epoch of Reionization