Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Samir Choudhuri"'
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 266, Iss 2, p 23 (2023)
Radio interferometers designed to probe the 21 cm signal from Cosmic Dawn and the Epoch of Reionization must contend with systematic effects that make it difficult to achieve sufficient dynamic range to separate the 21 cm signal from foreground emiss
Externí odkaz:
https://doaj.org/article/6de41f51097e4f1abb36f686663dd278
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
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 512:186-198
Observation of redshifted 21-cm signals from neutral hydrogen holds the key to understanding the structure formation and its evolution during the reionization and post-reionization era. Apart from the presence of orders of magnitude larger foreground
Autor:
Abinash Kumar Shaw, Arnab Chakraborty, Mohd Kamran, Raghunath Ghara, Samir Choudhuri, Sk. Saiyad Ali, Srijita Pal, Abhik Ghosh, Jais Kumar, Prasun Dutta, Anjan Kumar Sarkar
The redshifted 21-cm radiation from the atomic hydrogen (HI) provides an excellent direct probe to study the evolution of HI in IGM and thus reveal the nature of the first luminous objects, their evolution and role during Cosmic Dawn (CD) and Epoch o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e18e3377b2532f399ca2859947836742
http://arxiv.org/abs/2211.05512
http://arxiv.org/abs/2211.05512
Autor:
Nirupam Roy, Hans Moritz Günther, Preetha Saha, Somnath Bharadwaj, Susmita Chakravorty, Randall K. Smith, Samir Choudhuri
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 502:5313-5324
The shell type supernova remnant (SNR) Cas A exhibits structures at nearly all angular scales. Previous studies show the angular power spectrum $(C_{\ell})$ of the radio emission to be a broken power law, consistent with MHD turbulence. The break has
Autor:
Srijita Pal, Kh Md Asif Elahi, Somnath Bharadwaj, Sk Saiyad Ali, Samir Choudhuri, Abhik Ghosh, Arnab Chakraborty, Abhirup Datta, Nirupam Roy, Madhurima Choudhury, Prasun Dutta
The post-reionization $(z \le 6)$ neutral hydrogen (HI) 21-cm intensity mapping signal holds the potential to probe the large scale structures, study the expansion history and constrain various cosmological parameters. Here we apply the Tapered Gridd
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff99d57e703d87aac5de0bab6d86f09b
Intensity mapping with the redshifted 21-cm line is an emerging tool in cosmology. Drift scan observations, where the antennas are fixed to the ground and the telescope's pointing center (PC) changes continuously on the sky due to earth's rotation, p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18f75513f9ac6e3e0c6f0fc232dc8f7d
Radio interferometers designed to probe the 21cm signal from Cosmic Dawn and the Epoch of Reionisation must contend with systematic effects that make it difficult to achieve sufficient dynamic range to separate the 21cm signal from foreground emissio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2bd149f87ba3d7bbee161ca20ec1c2f
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 494(2), 1936-1945
Measurements of the Galactic synchrotron emission is relevant for the 21-cm studies from the Epoch of Reionization. The study of the synchrotron emission is also useful to quantify the fluctuations in the magnetic field and the cosmic ray electron de
Autor:
Tirthankar Roy Choudhury, Nirupam Roy, Kanan K. Datta, Srijita Pal, Somnath Bharadwaj, Abhirup Datta, Samir Choudhuri, Prasun Dutta, Arnab Chakraborty, Huib Intema, Madhurima Choudhury
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 490:243-259
Understanding the low-frequency radio sky in depth is necessary to subtract foregrounds in order to detect the redshifted 21 cm signal of neutral hydrogen from the Cosmic Dawn, Epoch of Reionization (EoR) and post-reionization era. In this second pap