Signals of the cosmological reionization in the radio sky through C and O fine structure lines
arXiv:1004.1087 · doi:10.1111/j.1365-2966.2011.19751.x
Abstract
We study the excitation of fine structure levels of C I, C II and O I by ultraviolet (UV) photons around strong UV sources which are also ionizing sources of the cosmological reionization at redshift of . The evolutions of ionized regions around a point source are calculated by solving rate equations for non-equilibrium chemistry. Signals of UV photons through the fine structure lines are considered to be stronger at locations of more abundant chemical species of C I, C II and O I. Such environments would be realized where strong fluxes of non-ionizing UV line photons available for the pumping up of fine structure levels exist, and simultaneously ionizing UV photons are effectively shielded by dense H I regions. Signals from H I regions of moderately large densities induced by redshifted UV photons emitted at the point sources are found to be dominantly large over those of others. We discuss the detectability of the signals, and show that signals from idealized environments will be possibly detected by radio observations with next-generation arrays to come after the Atacama Large Millimeter/submillimeter Array (ALMA).
23 pages, 21 figures, significant revisions in Secs. 2, 3, and 4, and Appendix, main conclusions unchanged, accepted for publication in Monthly Notices of the Royal Astronomical Society
References in corpus (16)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Power Spectra and WMAP-Derived Parameters
- Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
- The Evolution of Dust in the Early Universe with Applications to the Galaxy SDSS J1148+5251
- Simulations of Cosmic Chemical Enrichment
- Probing the Evolution of IR Properties of z~6 Quasars: Spitzer Observations
- Dust-free quasars in the early Universe
- Strong [CII] emission at high redshift
- A Detection of [CII] line emission in the z=4.7 QSO BR1202-0725
- A Sensitive Search For [NII] Emission in a z=6.4 Quasar Host Galaxy
- Chemistry of heavy elements in the Dark Ages
- Measuring the Primordial Deuterium Abundance During the Cosmic Dark Ages
- Redshifted intergalactic 3He+ 8.7 GHz hyperfine absorption
- Tomography of the Reionization Epoch with Multifrequency CMB Observations
- Oxygen pumping II: Probing the Inhomogeneous Metal Enrichment at the Epoch of Reionization with High Frequency CMB Observations
- On the Detectability of the Hydrogen 3-cm Fine Structure Line from the EoR