21 cm angular-power spectrum from the dark ages
نویسندگان
چکیده
منابع مشابه
Redshifted 21-cm Signals in the Dark Ages
We have carried out semianalytic simulations to build redshifted 21-cm maps in the dark ages. An entropy-floor model is adopted for planting protogalaxies in simulated minihaloes. The model allocates gas quantities such as baryonic mass and temperature to every N -body particle and extensively exploits the particle nature of the data in the subsequent analysis. We have found that the number den...
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We present first results from the SCI-HI experiment, which we used to measure the all-sky-averaged 21 cm brightness temperature in the redshift range 14.8 < z < 22.7. The instrument consists of a single broadband sub-wavelength size antenna and a sampling system for real-time data processing and recording. Preliminary observations were completed in 2013 June at Isla Guadalupe, a Mexican biosphe...
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Observations of redshifted 21cm radiation from neutral hydrogen (HI) at high redshifts is an important future probe of reionization. We consider the Multi-frequency Angular Power Spectrum (MAPS) to quantify the statistics of the HI signal as a joint function of the angular multipole l and frequency separation ∆ν. The signal at two different frequencies is expected to get decorrelated as ∆ν is i...
متن کاملOn the Direct Detectability of the Cosmic Dark Ages: 21-cm Emission from Minihalos
In the standard Cold Dark Matter (CDM) theory of structure formation, virialized minihalos (with Tvir . 10 4 K) form in abundance at high redshift (z > 6), during the cosmic “dark ages.” The hydrogen in these minihalos, the first nonlinear baryonic structures to form in the universe, is mostly neutral and sufficiently hot and dense to emit strongly at the 21-cm line. We calculate the emission f...
متن کاملOn the Detectability of the Cosmic Dark Ages: 21-cm Lines from Minihalos
In the standard Cold Dark Matter (CDM) theory of structure formation, virialized minihalos (with Tvir ≤ 10,000K) form in abundance at high redshift (z >∼ 6), during the cosmic “dark ages.” The hydrogen in these minihalos, the first nonlinear baryonic structures to form in the universe, is mostly neutral and sufficiently hot and dense to emit strongly at the 21-cm line. We calculate the emission...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2007
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.76.083005