Results 31 to 40 of about 23,023 (219)
Reionization and Beyond: detecting the peaks of the cosmological 21cm signal [PDF]
, 2014 [ABRIDGED] The cosmological 21cm signal is set to become the most powerful probe of the early Universe, with first generation interferometers aiming to make statistical detections of reionization. There is increasing interest also in the pre-reionization
Ewall-Wice, Aaron +2 more
core +1 more source
Frontiers in Astronomy and Space Sciences, 2017 The reionization of helium at z ~ 3 is the final phase transition of the intergalactic medium and supposed to be driven purely by quasars. The He ii transverse proximity effect—enhanced He ii transmission in a background sightline caused by the ionizing ...
Tobias M. Schmidt +8 more
doaj +1 more source
The Astrophysical Journal, 2023 Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration
Hanjue Zhu, Nickolay Y. Gnedin
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High resolution simulations of the reionization of an isolated Milky Way - M31 galaxy pair [PDF]
, 2013 We present the results of a set of numerical simulations aimed at studying reionization at galactic scale. We use a high resolution simulation of the formation of the Milky Way-M31 system to simulate the reionization of the local group.
Aubert, D. +7 more
core +2 more sources
The infancy of cosmic reionization [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We consider the early stages of cosmic hydrogen or helium reionization, when ionizing sources were still rare. We show that Poisson fluctuations in the galaxy distribution substantially affected the early bubble size distribution, although galaxy clustering was also an essential factor even at the earliest times.
openaire +3 more sources
Astronomy & AstrophysicsAims. The escape fraction of Lyman continuum photons (fesc(LyC)) is the last key unknown in our understanding of cosmic reionization. Directly estimating the escape fraction (fesc) of ionizing photons in the epoch of reionization (EoR) is impossible, due
Giovinazzo Emma +17 more
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Reionization Histories of Milky Way Mass Halos
, 2013 We investigate the connection between the epoch of reionization and the present day universe, by examining the extended mass reionization histories of dark matter halos identified at z=0.
Abel, Tom +3 more
core +2 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
Astronomy & AstrophysicsWe report the measurement of the R3 = [O III] λ5008/Hβ ratios for 54 galaxies in the GLIMPSE-D survey. Thanks to gravitational lensing, our sample includes galaxies with −20 ≲ MUV
Korber Damien +15 more
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Crossing the Rubicon of Reionization with z ∼ 5 QSOs
The Astrophysical Journal, 2023 One of the key open questions in cosmology is the nature of sources that completed cosmological hydrogen reionization at z ∼ 5.2. High- z primeval galaxies have been long considered the main drivers of reionization, with a minor role played by high- z ...
Andrea Grazian +14 more
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