Zobrazeno 1 - 10
of 263
pro vyhledávání: '"21-cm cosmology"'
Autor:
Kirkham, Christian J., Handley, William J., Zhu, Jiacong, Artuc, Kaan, Leeney, Samuel A. K., Bevins, Harry T. J., Anstey, Dominic J., Acedo, Eloy de Lera
Due to the large dynamic ranges involved with separating the cosmological 21-cm signal from the Cosmic Dawn from galactic foregrounds, a well-calibrated instrument is essential to avoid biases from instrumental systematics. In this paper we present t
Externí odkaz:
http://arxiv.org/abs/2412.14023
In 21-cm experimental cosmology, accurate characterization of a radio telescope's antenna beam response is essential to measure the 21-cm signal. Computational electromagnetic (CEM) simulations estimate the antenna beam pattern and frequency response
Externí odkaz:
http://arxiv.org/abs/2408.16135
Autor:
Katz, Omer Zvi
The light of the first astrophysical objects is expected to leave an imprint on the global 21-cm signal as it heats, excites, and ionizes neutral hydrogen. This dependence on early astrophysics introduces significant uncertainties in modeling the 21-
Externí odkaz:
http://arxiv.org/abs/2408.02055
Autor:
O'Hara, Oscar Sage David, Dulwich, Fred, Acedo, Eloy de Lera, Dhandha, Jiten, Gessey-Jones, Thomas, Anstey, Dominic, Fialkov, Anastasia
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 533, Issue 3, September 2024, Pages 2876-2892
The Cosmic Dawn was marked by the formation of the first stars, and preceded the Epoch of Reionization (EoR), when the Universe underwent a fundamental transformation caused by the radiation from these first stars and galaxies. Interferometric 21-cm
Externí odkaz:
http://arxiv.org/abs/2402.04008
21-cm cosmology provides an exciting opportunity to probe new physics dynamics in the early universe. In particular, a tiny sub-component of dark matter that interacts strongly with the visible sector may cool the gas in the intergalactic medium and
Externí odkaz:
http://arxiv.org/abs/2401.10978
Autor:
Gessey-Jones, T., Pochinda, S., Bevins, H. T. J., Fialkov, A., Handley, W. J., Acedo, E. de Lera, Singh, S., Barkana, R.
Constraints on the potential properties of superconducting cosmic strings provide an indirect probe of physics beyond the standard model at energies inaccessible to terrestrial particle colliders. In this study, we perform the first joint Bayesian an
Externí odkaz:
http://arxiv.org/abs/2312.08828
Radio observations of the neutral hydrogen signal from the Cosmic Dawn and Epoch of Reionisation have helped to provide constraints on the properties of the first stars and galaxies. Since this global 21-cm cosmological signal from the Cosmic Dawn is
Externí odkaz:
http://arxiv.org/abs/2310.17975
Autor:
Hassan, Sultan, Lovell, Christopher C., Madau, Piero, Huertas-Company, Marc, Somerville, Rachel S., Burkhart, Blakesley, Dixon, Keri L., Feldmann, Robert, Starkenburg, Tjitske K., Wu, John F., Jespersen, Christian Kragh, Gelfand, Joseph D., Bera, Ankita
An unprecedented array of new observational capabilities are starting to yield key constraints on models of the epoch of first light in the Universe. In this Letter we discuss the implications of the UV radiation background at cosmic dawn inferred by
Externí odkaz:
http://arxiv.org/abs/2305.02703
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Accurate detection of the cosmological 21-cm global signal requires galactic foreground models which can remove power over ~$10^6$. Although foreground and global signal models unavoidably exhibit overlap in their vector-spaces inducing bias error in
Externí odkaz:
http://arxiv.org/abs/2304.09959