Results 51 to 60 of about 36,124 (299)
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
doaj +1 more source
Living Reviews in Computational Astrophysics, 2022 AbstractThe transformation of cold neutral intergalactic hydrogen into a highly ionized warm plasma marks the end of the cosmic dark ages and the beginning of the age of galaxies. The details of this process reflect the nature of the early sources of radiation and heat, the statistical characteristics of the large-scale structure of the Universe, the ...
Nickolay Y. Gnedin, Piero Madau
openaire +2 more sources
Dark Energy from Cosmological Energy Conservation
Advances in Astronomy, Volume 2023, Issue 1, 2023., 2023 The value of the gravitational wave energy density is unknown. Current progress in gravitational wave detection suggests that the energy density of the stochastic gravitational wave background (SGWB) will be estimated in the next decades. A derivation of its value is presented under the assumption that energy lost due to cosmic redshift is fully ...
Manuel Uruena Palomo, Rubab Manzoor
wiley +1 more source
Searching for the reionization sources [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2007 Abstract Using a reionization model simultaneously accounting for a number of experimental data sets, we investigate the nature and properties of reionization sources. Such a model predicts that hydrogen reionization starts at z≈ 15, is initially driven by metal-free (Population III) stars, and is 90 per cent complete by z≈ 8.
Choudhury, T. Roy, FERRARA, ANDREA
openaire +4 more sources
Rapid Reionization by the Oligarchs: The Case for Massive, UV-bright, Star-forming Galaxies with High Escape Fractions [PDF]
Astrophysical Journal, 2019 The protagonists of the last great phase transition of the universe—cosmic reionization—remain elusive. Faint star-forming galaxies are leading candidates because they are found to be numerous and may have significant ionizing photon escape fractions ( ).
R. Naidu +5 more
semanticscholar +1 more source
Progress and Challenges in Electromechanical Coupling of Radio Telescopes
International Journal of Antennas and Propagation, Volume 2022, Issue 1, 2022., 2022 Radio astronomy is a discipline of dynamics and wonders. The vast universe has many secrets to unravel. As one of the important facilities in this discipline, radio telescopes play a key role in collecting astronomical data and unraveling mysteries.
Yuefei Yan +10 more
wiley +1 more source
Inferences on the timeline of reionization at z ∼ 8 from the KMOS Lens-Amplified Spectroscopic Survey [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Detections and non-detections of Lyman alpha (Lyα) emission from z > 6 galaxies ( 7, where Lyα redshifts to near infra-red wavelengths. Here we present a search for z > 7.2 Lyα emission in 53 intrinsically faint Lyman Break Galaxy candidates ...
C. Mason +14 more
semanticscholar +1 more source
A (conditional) role for labdane‐related diterpenoid natural products in rice stomatal closure
New Phytologist, Volume 230, Issue 2, Page 698-709, April 2021., 2021 Summary Rice (Oryza sativa) is the staple food for over half the world’s population. Drought stress imposes major constraints on rice yields. Intriguingly, labdane‐related diterpenoid (LRD) phytoalexins in maize (Zea mays) affect drought tolerance, as indicated by the increased susceptibility of an insertion mutant of the class II diterpene cyclase ...
Juan Zhang +9 more
wiley +1 more source
Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7 [PDF]
Astrophysical Journal, 2018 During reionization, neutral hydrogen in the intergalactic medium (IGM) imprints a damping wing absorption feature on the spectrum of high-redshift quasars.
F. Davies +12 more
semanticscholar +1 more source
Angewandte Chemie, Volume 132, Issue 30, Page 12545-12549, July 20, 2020., 2020 There they are! Phenylphosphinidene oxide and phenylphosphinidene sulphide can readily be prepared through photoinduced fragmentation of their corresponding phosphonic diazide precursors. They were identified using IR and UV/Vis spectroscopies in combination with computational methods.
Artur Mardyukov +2 more
wiley +2 more sources