Results 61 to 70 of about 830 (187)

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

Simulating Reionization: Character and Observability [PDF]

AIP Conference Proceedings, 2008
In recent years there has been considerable progress in our understanding of the nature and properties of the reionization process. In particular, the numerical simulations of this epoch have made a qualitative leap forward, reaching sufficiently large scales to derive the characteristic scales of the reionization process and thus allowing for ...
Iliev, I T, Shapiro, P R, Mellema, G, Pen, U L, McDonald, P, Bond, J R   +5 more
openaire   +2 more sources

Radio Frequency Interference Detection Using Swin Transformer Embedding U2‐Net

Advances in Astronomy, Volume 2025, Issue 1, 2025.
Radio frequency interference (RFI) is radio wave interference from natural sources or man‐made models. In radio astronomy research, the signals of celestial objects captured by radio telescopes are extremely weak, and the presence of RFI can significantly mask or distort those signals, reducing the accuracy of observational data and seriously affecting
Shengdi Chen, Bo Liang, Sándor Frey
wiley   +1 more source

Perspectives for Cosmological Reionization From Future CMB and Radio Projects

Frontiers in Astronomy and Space Sciences, 2018
In spite of the great recent results from the Planck satellite supporting cosmological reionization scenarios almost compatible with astrophysical models for the evolution of structure, galaxy and star formation, the full understanding of the ...
Tiziana Trombetti, Tiziana Trombetti, Carlo Burigana, Carlo Burigana, Carlo Burigana   +4 more
doaj   +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

Gas‐Phase Formation of Sulfurous Acid (H2SO3) in the Atmosphere

Angewandte Chemie International Edition, Volume 63, Issue 30, July 22, 2024.
Laboratory experiments show the formation of sulfurous acid (H2SO3) from the gas‐phase reaction of OH radicals with CH3S(O)OH for atmospheric reaction conditions with a molar yield of ∼50 %. H2SO3 represents a hard‐to‐reach acid that has never been observed in aqueous solution. In the gas phase, if once formed, it shows a certain kinetic stability with
Torsten Berndt, Erik H. Hoffmann, Andreas Tilgner, Hartmut Herrmann   +3 more
wiley   +1 more source

On the Reionization of the Universe

Chinese Journal of Astronomy and Astrophysics, 2006
[12 pages, 6 figures] Invited talk given at the Frascati Workshop 2005 "Multifrequency Behaviour of High Energy Cosmic Sources", eds. F. Giovannelli and Lola Sabau-Graziati; to appear in a special issue of the Chinese Journal of Astronomy & ...
openaire   +2 more sources

The Epoch of Reionization [PDF]

, 2012
The Universe's dark ages end with the formation of the first generation of galaxies. These objects start emitting ultraviolet radiation that carves out ionized regions around them. After a sufficient number of ionizing sources have formed, the ionized fraction of the gas in the Universe rapidly increases until hydrogen becomes fully ionized.
openaire   +4 more sources

The 21cm–galaxy cross-correlation: Realistic forecast for 21cm signal detection and reionisation constraints

Astronomy & Astrophysics
Context. The 21cm–galaxy cross-correlations are expected to play a key role in the confirmation of the cosmological 21cm signal. Aims. We investigate which survey configurations detect the 21cm–Lyman-α emitter (LAE) cross-correlation signal and assess ...
Hutter Anne, Heneka Caroline
doaj   +1 more source

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, Claudia M. Scarlata, Evan D. Skillman, Nathan R. Eggen, Anne E. Jaskot, Vihang Mehta, John M. Cannon   +6 more
doaj   +1 more source