منابع مشابه
Weak Gravitational Lensing of High-redshift 21 Cm Power Spectra
We describe the effects of weak gravitational lensing by cosmological large scale structure on the diffuse emission of 21 centimeter radiation from neutral hydrogen at high redshifts during the era of reionization. The ability to observe radial information through the frequency, and thus threedimensional regions of the background radiation at different redshifts, suggests that 21 cm studies may...
متن کاملRedshift Space 21 Cm Power Spectra from Reionization
We construct a simple but self-consistent analytic ionization model for rapid exploration of 21cm power spectrum observables in redshift space. It is fully described by the average ionization fraction xe(z) and HII patch size R(z) and has the flexibility to accommodate various reionization scenarios. The model associates ionization regions with dark matter halos of the number density required t...
متن کاملWouthuysen-Field Coupling in the 21 cm Region Around High Redshift Sources
The 21 cm emission and absorption from gaseous halos around the first generation of stars substantially depend on the Wouthuysen-Field (W-F) coupling, which relates the spin temperature with the kinetic temperature of hydrogen gas via the resonant scattering between Lyα photons and neutral hydrogen. Therefore, the existence of Lyα photons in the 21 cm region is essential. Although the center ob...
متن کاملScintillation noise power spectrum and its impact on high-redshift 21-cm observations
Visibility scintillation resulting from wave propagation through the turbulent ionosphere can be an important source of noise at low radio frequencies (ν 200MHz). Many low-frequency experiments are underway to detect the power spectrum of brightness temperature fluctuations of the neutral-hydrogen 21-cm signal from the Epoch of Reionization (EoR: 12 z 7, 100 ν 175 MHz). In this paper, we derive...
متن کاملWouthuysen-Field Coupling in 21 cm Region Around High Redshift Sources
The 21 cm emission and absorption from gaseous halos around the first generation of stars substantially depend on the Wouthuysen-Field (W-F) coupling, which relates the spin temperature with the kinetic temperature of hydrogen gas via the resonant scattering between Lyα photons and neutral hydrogen. Therefore, the existence of Lyα photons in the 21 cm region is essential. Although the center ob...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1977
ISSN: 0252-9211
DOI: 10.1017/s0252921100053884