Results 41 to 50 of about 26,451 (248)
A very extended reionization epoch? [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 The recent observations of cross temperature-polarization power spectra of the Cosmic Microwave Background (CMB) made by the WMAP satellite are in better agreement with a high value of the Thomson scattering optical depth \approx 0.17. This value is close to = 0.3, which is taken as the upper limit in the parameter extraction analysis made by the ...
Melchiorri, A. +3 more
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Inhomogeneous Reionization Models in Cosmological Hydrodynamical Simulations [PDF]
, 2019 In this work we present a new hybrid method to simulate the thermal effects of the reionization in cosmological hydrodynamical simulations. The method improves upon the standard approach used in simulations of the intergalactic medium (IGM) and galaxy ...
Davies, F. B. +4 more
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Perspectives for Cosmological Reionization From Future CMB and Radio Projects
Frontiers in Astronomy and Space Sciences, 2018 In spite of the great recent results from the Planck satellite supporting cosmological reionization scenarios almost compatible with astrophysical models for the evolution of structure, galaxy and star formation, the full understanding of the ...
Tiziana Trombetti +4 more
doaj +1 more source
Self-regulated reionization [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 Recently, we have presented the first large-scale radiative transfer simulations of reionization. Here we present new simulations which extend the source halo mass range downward to 10^8M_solar, to capture the full range of halo masses thought to be primarily responsible for reionization by their star formation following atomic hydrogen radiative ...
Iliev, Ilian T. +3 more
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Reionization with Simba: How Much Does Astrophysics Matter in Modeling Cosmic Reionization?
The Astrophysical Journal, 2022 Abstract Traditional large-scale models of reionization usually employ simple deterministic relations between halo mass and luminosity to predict how reionization proceeds. We here examine the impact on modeling reionization of using more detailed models for the ionizing sources as identified within the 100 h −1 Mpc ...
Sultan Hassan +7 more
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HST UV Spectroscopy of the Dwarf Starburst Galaxy Pox 186
The Astrophysical Journal, 2023 Studying the galaxies responsible for reionization is often conducted through local reionization-era analogs; however, many of these local analogs are too massive to be representative of the low-mass star-forming galaxies that are thought to play a ...
Noah S. J. Rogers +6 more
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Cosmic Reionization Redux [PDF]
The Astrophysical Journal, 2006 Submitted to ApJ.
Gnedin, Nickolay Y., Fan, Xiaohui
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Cosmic reionization constraints on the nature of cosmological perturbations [PDF]
, 2006 We study the reionization history of the Universe in cosmological models with non-Gaussian density fluctuations, taking them to have a renormalized $\chi^2$ probability distribution function parametrized by the number of degrees of freedom, $\nu$.
Avelino, Pedro P, Liddle, Andrew R
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Characterizing the epoch of reionization with the small-scale CMB: Constraints on the optical depth and duration [PDF]
, 2018 Patchy reionization leaves a number of imprints on the small-scale cosmic microwave background (CMB) temperature fluctuations, the largest of which is the kinematic Sunyaev-Zel'dovich (kSZ), the Doppler shift of CMB photons scattering off moving ...
Ferraro, S, Smith, KM
core +3 more sources
Early reionization in cosmology [PDF]
Infrared Physics & Technology, 1994 The cosmic microwave background (CMB) anisotropies have turned out to represent one of the most stringent 'bottle necks' for scenarios of large scale structure formation. As a possibility to relax this constraint, it has been proposed that early reionization can damp CMB fluctuations on small scales due to photon diffusion in the ionized plasma.
openaire +3 more sources