Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Rennan Barkana"'
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 2, p L25 (2024)
The efficiency of radio emission is an important unknown parameter of early galaxies at cosmic dawn, as models with high efficiency have been shown to modify the cosmological 21 cm signal substantially, deepening the absorption trough and boosting th
Externí odkaz:
https://doaj.org/article/0ed2af33b8a440b894967b2606d7593f
Autor:
The HERA Collaboration: Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Rennan Barkana, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Daniela Breitman, Philip Bull, Jacob Burba, Steve Carey, Chris L. Carilli, Carina Cheng, Samir Choudhuri, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Anastasia Fialkov, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Hugh Garsden, Brian Glendenning, Adélie Gorce, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Stefan Heimersheim, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, Nicholas S. Kern, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, David Lewis, Adrian Liu, Anita Loots, Yin-Zhe Ma, David H. E. MacMahon, Lourence Malan, Keith Malgas, Cresshim Malgas, Matthys Maree, Bradley Marero, Zachary E. Martinot, Lisa McBride, Andrei Mesinger, Jordan Mirocha, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Julian B. Muñoz, Steven G. Murray, Vighnesh Nagpal, Abraham R. Neben, Bojan Nikolic, Chuneeta D. Nunhokee, Hans Nuwegeld, Aaron R. Parsons, Robert Pascua, Nipanjana Patra, Samantha Pieterse, Yuxiang Qin, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Mario G. Santos, Peter Sims, Saurabh Singh, Craig Smith, Hilton Swarts, Jianrong Tan, Nithyanandan Thyagarajan, Michael J. Wilensky, Peter K. G. Williams, Pieter van Wyngaarden, Haoxuan Zheng
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 2, p 124 (2023)
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization Array (HERA). Using similar analysis techniques as in previously repor
Externí odkaz:
https://doaj.org/article/ccbac6f812eb4a529df00c97b35f91cd
At cosmic dawn, the 21 cm signal from intergalactic hydrogen was driven by Ly-α photons from some of the earliest stars, producing a spatial pattern that reflected the distribution of galaxies at that time. Due to the large foreground, it is thought
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::56f206accd4b10e475cd0f8726c0a87c
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 503:1221-1232
The early epoch in which the first stars and galaxies formed is among the most exciting unexplored eras of the Universe. A major research effort focuses on probing this era with the 21-cm spectral line of hydrogen. While most research focused on stat
Autor:
Harish Vedantham, Daan Meerburg, Joseph Lazio, A. R. Offringa, Jonathan R. Pritchard, Rennan Barkana, Andrei Mesinger, Anastasia Fialkov, Abhirup Datta, Saleem Zaroubi, B. K. Gehlot, Heino Falcke, Léon V. E. Koopmans, Mark J. Bentum, Marc Klein-Wolt, Philippe Zarka, Jack O. Burns, Cathryn M. Trott, Licia Verde, Leonid I. Gurvits, Xuelei Chen, Florent Mertens, Ravi Subrahmanyan, Vibor Jelić, Judd D. Bowman, Gianni Bernardi, Garrelt Mellema, Albert-Jan Boonstra, B. Semelin, Joseph Silk
Publikováno v:
Experimental Astronomy: an international journal on astronomical instrumentation and data analysis, 51(3)
Experimental Astronomy, 51, 1641-1676
Experimental Astronomy, 51, pp. 1641-1676
Experimental Astronomy, 51, 1641-1676
Experimental Astronomy, 51, pp. 1641-1676
Neutral hydrogen pervades the infant Universe, and its redshifted 21-cm signal allows one to chart the Universe. This signal allows one to probe astrophysical processes such as the formation of the first stars, galaxies, (super)massive black holes an
Autor:
Raghunath Ghara, Luitje Koopmans, Anastasia Fialkov, Abhik Ghosh, Ilian T. Iliev, Garrelt Mellema, Saleem Zaroubi, Rajesh Mondal, Florent Mertens, Sambit K. Giri, B. K. Gehlot, B. Ciardi, Vishambhar Pandey, Rennan Barkana, A. R. Offringa, C. Fling
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 498(3), 4178-4191. Oxford University Press
The ARCADE2 and LWA1 experiments have claimed an excess over the Cosmic Microwave Background (CMB) at low radio frequencies. If the cosmological high-redshift contribution to this radio background is between 0.1% and 22% of the CMB at 1.42 GHz, it co
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 495:4845-4859
The 21-cm signal of neutral hydrogen is a sensitive probe of the Epoch of Reionization (EoR) and Cosmic Dawn. Currently operating radio telescopes have ushered in a data-driven era of 21-cm cosmology, providing the first constraints on the astrophysi
The 21-cm signal from cosmic dawn and the epoch of reionization (EoR) probes the characteristics of the high redshift galaxy population. Many of the astrophysical properties of galaxies at high redshifts are currently unconstrained due to the lack of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55ac4fc4a253adb2465858b7c324f733
Autor:
Mattis Magg, Itamar Reis, Anastasia Fialkov, Rennan Barkana, Ralf S Klessen, Simon C O Glover, Li-Hsin Chen, Tilman Hartwig, Anna T P Schauer
Mapping Cosmic Dawn with 21-cm tomography offers an exciting new window into the era of primordial star formation. However, self-consistent implementation of both the process of star formation and the related 21-cm signal is challenging, due to the m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbe55fc35d2cb66e0fcb8efac2b23815
We present the evolution of the 21-cm signal from cosmic dawn and the epoch of reionization (EoR) in an upgraded model including three subtle effects of Ly-a radiation: Ly-a heating, CMB heating (mediated by Ly-a photons), and multiple scattering of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d07087f8b38727de4ab39cb0a80aac0