A simulation-calibrated limit on the H i power spectrum from the GMRT Epoch of Reionization experiment
Gregory Paciga,Joshua G. Albert,Kevin Bandura,Kevin Bandura,Tzu-Ching Chang,Tzu-Ching Chang,Yashwant Gupta,Christopher M. Hirata,Julia Odegova,Ue-Li Pen,Jeffrey B. Peterson,Jayanta Roy,J. Richard Shaw,Kris Sigurdson,Tabitha Voytek +14 more
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In this paper, the authors explored the use of a singular value decomposition to remove foregrounds with fewer assumptions about the foreground structure and provided a revised measurement of a 2σ upper limit at (248 mK)^2 for k = 0.6.Abstract:
The Giant Metrewave Radio Telescope Epoch of Reionization experiment is an ongoing effort to measure the power spectrum from neutral hydrogen at high redshift. We have previously reported an upper limit of (70 mK)^2 at wavenumbers of k ≈ 0.65 h Mpc^(−1) using a basic piecewise-linear foreground subtraction. In this paper, we explore the use of a singular value decomposition to remove foregrounds with fewer assumptions about the foreground structure. Using this method, we also quantify, for the first time, the signal loss due to the foreground filter and present new power spectra adjusted for this loss, providing a revised measurement of a 2σ upper limit at (248 mK)^2 for k = 0.50 h Mpc^(−1). While this revised limit is larger than previously reported, we believe it to be more robust and still represents the best current constraint on reionization at z ≈ 8.6.read more
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Possible interaction between baryons and dark-matter particles revealed by the first stars
TL;DR: The analysis indicates that the spatial fluctuations of the 21-centimetre signal at cosmic dawn could be an order of magnitude larger than previously expected and that the dark-matter particle is no heavier than several proton masses, well below the commonly predicted mass of weakly interacting massive particles.
Journal ArticleDOI
Paper-64 constraints on reionization: the 21 cm power spectrum at z = 8:4
Zaki S. Ali,Aaron R. Parsons,Haoxuan Zheng,Jonathan C. Pober,Adrian Liu,James E. Aguirre,Richard F. Bradley,Gianni Bernardi,Gianni Bernardi,Chris Carilli,Carina Cheng,David DeBoer,Matthew R. Dexter,Jasper Grobbelaar,Jasper Horrell,Daniel C. Jacobs,Patricia J. Klima,David MacMahon,Matthys Maree,David F. Moore,Nima Razavi,Irina I. Stefan,William P. Walbrugh,Andre Walker +23 more
TL;DR: Papernot et al. as mentioned in this paper reported new limits on 21cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa.
Journal ArticleDOI
New Limits on 21cm EoR From PAPER-32 Consistent with an X-Ray Heated IGM at z=7.7
Aaron R. Parsons,Adrian Liu,James E. Aguirre,Zaki S. Ali,Richard F. Bradley,Chris L. Carilli,David DeBoer,Matthew R. Dexter,Nicole E. Gugliucci,Daniel C. Jacobs,Pat Klima,David MacMahon,Jason Manley,David F. Moore,Jonathan C. Pober,Irina I. Stefan,William P. Walbrugh +16 more
TL;DR: In this article, the authors present new constraints on the 21cm EoR power spectrum derived from 3 months of observing with a 32-antenna, dual-polarization deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa.
Journal ArticleDOI
The Evolution of the Intergalactic Medium
TL;DR: In this article, the authors review the theoretical models and measurements that form the basis for the modern understanding of the intergalactic medium, and discuss unsolved puzzles (ranging from the largely unconstrained process of reionization at high z to the missing baryon problem at low z), highlighting the efforts that have the potential to solve them.
Journal ArticleDOI
NEW LIMITS ON 21 cm EPOCH OF REIONIZATION FROM PAPER-32 CONSISTENT WITH AN X-RAY HEATED INTERGALACTIC MEDIUM AT z = 7.7
Aaron R. Parsons,Adrian Liu,James E. Aguirre,Zaki S. Ali,Richard F. Bradley,Richard F. Bradley,Chris Carilli,David DeBoer,Matthew R. Dexter,Nicole E. Gugliucci,Daniel C. Jacobs,Pat Klima,David MacMahon,Jason Manley,David F. Moore,Jonathan C. Pober,Irina I. Stefan,William P. Walbrugh +17 more
TL;DR: In this article, the authors present new constraints on the 21 cm EoR power spectrum derived from three months of observing with a 32 antenna, dual-polarization deployment of the Donald C. Backer Precision Array for probing the Epoch of Reionization in South Africa.
References
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Seven-year wilkinson microwave anisotropy probe (wmap *) observations: cosmological interpretation
Eiichiro Komatsu,Kristine M. Smith,Jo Dunkley,Charles L. Bennett,B. Gold,Gary Hinshaw,Norman Jarosik,Davin Larson,M. R. Nolta,Lyman A. Page,David N. Spergel,Mark Halpern,Robert S. Hill,A. Kogut,Michele Limon,S. S. Meyer,N. Odegard,Gregory S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +20 more
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On the Density of Neutral Hydrogen in Intergalactic Space
James E. Gunn,Bruce A. Peterson +1 more
TL;DR: Density of neutral hydrogen in intergalactic space, using spectroscopic examination of quasi- stellar source 3C 9 using spectro-temporal analysis of 3C 7.
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Cosmology at low frequencies: The 21 cm transition and the high-redshift Universe
TL;DR: In this article, the physics of the 21 cm transition were reviewed, focusing on processes relevant at high redshifts, and the insights to be gained from such observations were described.
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Evidence for reionization at z ∼ 6: Detection of a gunn-peterson trough in a z = 6.28 quasar
Robert H. Becker,Robert H. Becker,Xiaohui Fan,Richard L. White,Michael A. Strauss,Vijay K. Narayanan,Robert H. Lupton,James E. Gunn,James Annis,Neta A. Bahcall,J. Brinkmann,A. J. Connolly,István Csabai,István Csabai,Paul C. Czarapata,Mamoru Doi,Timothy M. Heckman,Gregory S. Hennessy,Željko Ivezić,Gillian R. Knapp,D. Q. Lamb,Timothy A. McKay,Jeffrey A. Munn,Thomas Nash,Robert C. Nichol,Jeffrey R. Pier,Gordon T. Richards,Donald P. Schneider,Chris Stoughton,Alexander S. Szalay,Aniruddha R. Thakar,Donald G. York +31 more
TL;DR: In this paper, the authors present moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS).
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Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
Robert H. Becker,Xiaohui Fan,Richard L. White,Michael A. Strauss,Vijay K. Narayanan,Robert H. Lupton,James E. Gunn,James Annis,Neta A. Bahcall,J. Brinkmann,A. J. Connolly,István Csabai,Paul C. Czarapata,Mamoru Doi,Timothy M. Heckman,Gregory S. Hennessy,Zeljko Ivezic,Gillian R. Knapp,D. Q. Lamb,Timothy A. McKay,Jeffrey A. Munn,Thomas Nash,Robert C. Nichol,Jeffrey R. Pier,Gordon T. Richards,Donald P. Schneider,Chris Stoughton,Alexander S. Szalay,Anirudda R. Thakar,D. G. York +29 more
TL;DR: In this article, moderate resolution Keck spectroscopy of quasars at z=5.82, 5.99 and 6.28 was presented, and it was shown that the Ly Alpha absorption in the spectra evolves strongly with redshift.
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