Results 31 to 40 of about 727 (169)
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.
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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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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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Reionization in Technicolor [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 We present the Technicolor Dawn simulations, a suite of cosmological radiation-hydrodynamic simulations of the first 1.2 billion years. By modeling a spatially-inhomogeneous UVB on-the-fly with 24 frequencies and resolving dark matter halos down to $10^8 M_\odot$ within 12 $h^{-1}$ Mpc volumes, our simulations unify observations of the intergalactic ...
Kristian Finlator +4 more
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Detecting the signature of helium reionization through 3HeII 3.46 cm line-intensity mapping
Astronomy & AstrophysicsContext. Helium reionization is the most recent phase change of the intergalactic medium, yet its timing and main drivers remain uncertain. Among the probes to trace to trace how it unfolds, the 3.46 cm hyperfine line of singly ionized helium has opened ...
Spina Benedetta +6 more
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Observational Constraints on Cosmic Reionization [PDF]
Annual Review of Astronomy and Astrophysics, 2006 Observations have set the first constraints on the epoch of reionization (EoR), corresponding to the formation epoch of the first luminous objects. Studies of Gunn-Peterson (GP) absorption indicate a rapid increase in the neutral fraction of the intergalactic medium (IGM) from xHI< 10−4at z ≤ 5.5, to xHI> 10−3, perhaps up to 0.1, at z∼6, while ...
Fan, Xiaohui +2 more
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The epoch of helium reionization [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 39 pages, including 13 figures, submitted to ...
Sokasian, A., Abel, T., Hernquist, L.
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Simulating reionization in numerical cosmology [PDF]
New Astronomy, 2001 37 pages, 7 figures, Submitted to ...
Sokasian, A., Abel, T., Hernquist, L. E.
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First Observations and Characteristics of Positive Upward Illumination Strokes
Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.Abstract Upward Illumination (UI) strokes are a subtype of cloud‐to‐ground (CG) return strokes characterized by two concurrent branches striking the ground a few milliseconds apart. The luminous channel of an UI stroke does not connect to the main channel, which gives this phenomenon its name.
Antonio C. V. Saraiva +10 more
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The Astrophysical Journal, 2023 We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA).
The HERA Collaboration: Zara Abdurashidova +93 more
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