Results 91 to 100 of about 6,575 (221)

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

Establishing a relationship between the cosmological 21 cm power spectrum and interferometric closure phases

Astronomy & Astrophysics
Context. Measurements of the cosmic 21 cm background need to achieve a high dynamic range to isolate it from bright foreground emissions. Instrumental calibration inaccuracies can compromise the spectral fidelity of the smooth foreground continuum ...
Keller P. M., Nikolic B., Thyagarajan N.
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

Before its time: A remarkably evolved protocluster core at z = 7.88

Astronomy & Astrophysics
Protoclusters represent the most extreme environments in the very early Universe. They form from large-scale dark matter overdensities, harbouring an overabundance of galaxies fed by large gas reservoirs.
Witten Callum, Oesch Pascal A., McClymont William, Meyer Romain A., Fudamoto Yoshinobu, Sijacki Debora, Laporte Nicolas, Bennett Jake S., Simmonds Charlotte, Giovinazzo Emma, Danhaive A. Lola, Ciesla Laure, Carvajal-Bohorquez Cristian, Trebitsch Maxime   +13 more
doaj   +1 more source

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 Kinetic Sunyaev‐Zel’dovich Effect from Reionization

, 2019
During the epoch of reionization, local variations in the ionized fraction ( patchiness) imprint arcminute- scale temperature anisotropies in the CMB through the kinetic Sunyaev- Zel'dovich ( kSZ) effect.
Furlanetto, Steven R., McQuinn, Matthew, Hernquist, Lars, Zahn, Oliver, Zaldarriaga, Matias   +4 more
core   +1 more source

Reionization and dark matter decay

, 2016
Oldengott IM, Boriero D, Schwarz D. Reionization and dark matter decay. Journal of Cosmology and Astroparticle Physics. 2016;2016(8): 54.Cosmic reionization and dark matter decay can impact observations of the cosmic microwave sky in a similar way.
Boriero, Daniel, Oldengott, Isabel Mira, Schwarz, Dominik ; https://orcid.org/   +2 more
core   +1 more source

AGN jets versus accretion as reionization sources [PDF]

, 2020
Context. Cosmic reionization put an end to the dark ages that came after the recombination era. Observations seem to favor the scenario of massive-star photons generated in low-mass galaxies being responsible for the bulk of reionization and, whereas a ...
Núria Torres-Albà, Bosch i Ramon, Valentí, Valentí Bosch-Ramon, Torres Albà, Núria, Iwasawa, Kazushi, Kazushi Iwasawa, Torres-Albà, N., Bosch-Ramon, Valentí   +7 more
core   +1 more source

Is Double Reionization Physically Plausible?

, 2019
Recent observations of z similar to 6 quasars and the cosmic microwave background imply a complex history of cosmic reionization. Such a history requires some form of feedback to extend reionization over a long time interval, but the nature of the ...
Loeb, Abraham, Furlanetto, Steven
core   +1 more source

Background reionization history from omniscopes

, 2012
The measurements of the 21-cm brightness temperature fluctuations from the neutral hydrogen at the Epoch of Reionization should inaugurate the next generation of cosmological observables.
Tashiro, H., Clesse, S., Tytgat, Michel, Ringeval, C., Tytgat, Michel H.G., Clesse, Sébastien, Lopez Honorez, Laura, Christophe, Ringeval, Tashiro, Hiroyuki, Lopez-Honorez, Laura, Hiroyuki, Tashiro, Ringeval, Christophe, Tytgat, M., Tytgat, Michel H G, Lopez-Honorez, L.   +14 more
core   +1 more source