Results 21 to 30 of about 26,451 (248)
Bridging the Gap between Cosmic Dawn and Reionization Favors Models Dominated by Faint Galaxies
The Astrophysical Journal, 2023 It has been claimed that traditional models struggle to explain the tentative detection of the 21 cm absorption trough centered at z ∼ 17 measured by the EDGES collaboration. On the other hand, it has been shown that the EDGES results are consistent with
Ankita Bera +6 more
doaj +1 more source
Characteristic scales during reionization [PDF]
Monthly Notices of the Royal Astronomical Society, 2006 13 pages, 9 figures, in press at ...
Furlanetto, Steven R. +2 more
openaire +3 more sources
The Astrophysical Journal, 2023 We use large simulations of Ly α emitters with different fractions of ionized intergalactic medium to quantify the clustering of Ly α emitters as measured by the void probability function (VPF), and how it evolves under different ionization scenarios. We
Lucia A. Perez +3 more
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PAWS and POCO: NIR Astrophotonic Instruments for Astronomy
Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023 Abstract For near‐infrared ground and space‐based astronomy, compact photonic devices can replace the large bulk optical components in spectrographs, frequency combs, beam combiners, and sky subtraction filters, thus saving cost, reducing volume, weight, and power requirements.
Kalaga Madhav +8 more
wiley +1 more source
Early Reionization by Miniquasars [PDF]
The Astrophysical Journal, 2004 Motivated by the recent detection by WMAP of a large optical depth to Thomson scattering -- implying a very early reionization epoch -- we assess a scenario where the universe was reionized by `miniquasars' powered by intermediate-mass black holes (IMBHs), the remnants of the first generation of massive stars.
MADAU P. +4 more
openaire +4 more sources
Simulating the Cosmic Dawn With Enzo
Frontiers in Astronomy and Space Sciences, 2018 We review two decades of progress using the Enzo hydrodynamic cosmology code to simulate the Cosmic Dawn, a period of roughly 1 billion years beginning with the formation of the first stars in the universe, and ending with cosmic reionization.
Michael L. Norman +5 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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Detector system challenges of the wide‐field spectroscopic survey telescope (WST)
Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023 Abstract The wide‐field spectroscopic survey telescope (WST) is proposed to become the next large optical/near infrared facility for the European southern observatory (ESO) once the extremely large telescope (ELT) has become operational. While the latter is optimized for unprecedented sensitivity and adaptive‐optics assisted image quality over a small ...
Roland Bacon +4 more
wiley +1 more source
Cosmic Reionization on Computers: Properties of the Post-reionization IGM [PDF]
The Astrophysical Journal, 2017 Abstract We present a comparison between several observational tests of the post-reionization intergalactic medium and the numerical simulations of reionization completed under the Cosmic Reionization On Computers (CROC) project. The CROC simulations match the gap distribution reasonably well, and also provide a good match for the ...
Gnedin, Nickolay Y. +2 more
openaire +2 more sources
Journal of Geophysical Research: Space Physics, Volume 128, Issue 10, October 2023., 2023 Abstract We analyze the emission of energetic neutral atom (ENA) flux from charge exchange between Jovian magnetospheric ions and the atmospheres of Callisto and Europa. For this purpose, we combine the draped electromagnetic fields from a hybrid plasma model with a particle tracing tool for the energetic ions.
C. Michael Haynes +5 more
wiley +1 more source