Results 81 to 90 of about 27,730 (253)

The indirect influence of quasars on reionization [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2018
ABSTRACT The exact role of quasars during the Epoch of Reionization remains uncertain. With consensus leaning towards quasars producing a negligible amount of ionizing photons, we pose an alternate question: Can quasars indirectly contribute to reionization by allowing ionizing photons from stars to escape more easily?
Jacob Seiler, Anne Hutter, Manodeep Sinha, Darren Croton   +3 more
openaire   +4 more sources

The Role of Secondary Recoil Leaders in the Formation of Subsequent Return Strokes

Geophysical Research Letters, Volume 52, Issue 2, 28 January 2025.
Abstract Recoil leaders develop in lightning flash decayed channels. The propagation of a recoil leader depends on the charges stored at its tip and the conductivity of the decayed channel. When the recoil leader propagates over the entire channel, a subsequent return stroke happens.
Ivan T. Cruz, Marcelo M. F. Saba, José Claudio O. Silva, Carina Schumann   +3 more
wiley   +1 more source

The late reionization of filaments [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
16 pages, 9 figures, accepted to ...
Romeel Davé, Benjamin D. Oppenheimer, Kristian Finlator, Feryal Özel   +3 more
openaire   +3 more sources

Finding Peas in the Early Universe with JWST

The Astrophysical Journal Letters, 2023
The Early Release Observations (EROs) of JWST beautifully demonstrate the promise of JWST in characterizing the universe at Cosmic Dawn. We analyze the Near Infrared Spectrograph ERO spectra of three z ∼ 8 galaxies to determine their metallicities, gas ...
James E. Rhoads, Isak G. B. Wold, Santosh Harish, Keunho J. Kim, John Pharo, Sangeeta Malhotra, Austen Gabrielpillai, Tianxing Jiang, Huan Yang   +8 more
doaj   +1 more source

Measuring the History of Cosmic Reionization using the 21-cm PDF from Simulations [PDF]

, 2009
The 21-cm PDF (i.e., distribution of pixel brightness temperatures) is expected to be highly non-Gaussian during reionization and to provide important information on the distribution of density and ionization.
Barkana, Barkana, Barkana, Barkana, Barkana, Bharadwaj, Bowman, Cash, Ciardi, Furlanetto, Furlanetto, Garrelt Mellema, Harker, Ilian T. Iliev, Iliev, Iliev, Iliev, Iliev, Iliev, Kazuhide Ichikawa, Madau, McQuinn, McQuinn, Mellema, Mellema, Merz, Paul R. Shapiro, Rennan Barkana, Saiyad-Ali, Santos, Spergel, Wyithe, Zahn   +32 more
core   +5 more sources

Constraints on the Observability of Energetic Neutral Atoms From the Magnetosphere‐Atmosphere Interactions at Callisto and Europa

Journal of Geophysical Research: Space Physics, Volume 130, Issue 1, January 2025.
Abstract We investigate the emission of energetic neutral atoms (ENAs) from the magnetosphere‐atmosphere interactions at Europa and Callisto that may be observed by an ENA imaging instrument. To do so, we combine the draped electromagnetic fields from the AIKEF hybrid model with a tracing tool for the energetic magnetospheric parent ions.
C. Michael Haynes, Tyler Tippens, Sven Simon, Lucas Liuzzo   +3 more
wiley   +1 more source

Model-independent constraints on reionization from large-scale CMB polarization

, 2007
On large angular scales, the polarization of the CMB contains information about the evolution of the average ionization during the epoch of reionization.
Michael J. Mortonson, Totani T., Wayne Hu   +2 more
core   +1 more source

Architecture Design and Ground Performance of Netherlands‐China Low‐Frequency Explorer

Radio Science, Volume 59, Issue 8, August 2024.
Abstract The Netherlands‐China Low‐Frequency Explorer (NCLE) (Boonstra et al., 2017, https://www.ursi.org/proceedings/procGA17/papers/Paper_J19‐2(1603).pdf; Chen et al., 2020, https://ui.adsabs.harvard.edu/abs/2020AAS…23610203C/abstract) is a radio instrument for astrophysical studies in the low‐frequency range (80 kHz–80 MHz).
Sukanth Karapakula, Christiaan Brinkerink, Antonio Vecchio, Hamid R. Pourshaghaghi, Peter Dolron, Roel Jordans, Eric Bertels, Gerard Aalbers, Mark Ruiter, Albert J. Boonstra, Mark Bentum, David Prinsloo, Michel Arts, Jeanette Bast, Sieds Damstra, Albert van Duin, Nico Ebbendorf, Hans van der Marel, Juergen Morawietz, Roel Witvers, Wietse Poiesz, Rico van Dongen, Baptiste Cecconi, Philippe Zarka, Moustapha Dekkali, Linjie Chen, Mingyuan Wang, Mo Zhang, Maohai Huang, Yihua Yan, Liang Dong, Baolin Tan, Lihua Zhang, Liang Xiong, Ji Sun, Hongbo Zhang, Jinsong Ping, Marc Klein Wolt, Heino Falcke   +38 more
wiley   +1 more source

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, Alessandro, T. R. Choudhury, P. Serra, A. Ferrara   +3 more
openaire   +3 more sources

Prospects for 21 cm Galaxy Cross-correlations with HERA and the Roman High-latitude Survey

The Astrophysical Journal, 2023
The cross-correlation between the 21 cm field and the galaxy distribution is a potential probe of the Epoch of Reionization (EoR). The 21 cm signal traces neutral gas in the intergalactic medium and, on large spatial scales, this should be anticorrelated
Paul La Plante, Jordan Mirocha, Adélie Gorce, Adam Lidz, Aaron Parsons   +4 more
doaj   +1 more source