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Baryon Acoustic Oscillation Intensity Mapping of Dark Energy
TLDR
Here it is shown how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three-dimensional intensity mapping, and may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.Abstract:
The expansion of the universe appears to be accelerating, and the mysterious anti-gravity agent of this acceleration has been called ``dark energy''. To measure the dynamics of dark energy, Baryon Acoustic Oscillations (BAO) can be used. Previous discussions of the BAO dark energy test have focused on direct measurements of redshifts of as many as $10^9$ individual galaxies, by observing the 21cm line or by detecting optical emission. Here we show how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three dimensional intensity mapping. If our estimates gain acceptance they may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.read more
Citations
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Journal ArticleDOI
Redshift-space distortions of the H I 21-cm intensity mapping signal due to the internal motions within galaxies
TL;DR: In this paper, a line profile that accounts for both the rotational and random (thermal and turbulent) motions of the galaxies within galaxies is used to simulate the 21-cm power spectrum over the redshift range.
Journal ArticleDOI
HInet: Generating neutral hydrogen from dark matter with neural networks
TL;DR: In this article, the authors use convolutional neural networks to find the mapping between the spatial distribution of matter from N-body simulations and cosmic neutral hydrogen (HI) from the state-of-the-art hydrodynamic simulation IllustrisTNG.
Proceedings ArticleDOI
Holographic Beam Mapping of the CHIME Pathfinder Array
Philippe Berger,Laura Newburgh,Mandana Amiri,Kevin Bandura,J. F. Cliche,Liam Connor,Meiling Deng,Nolan Denman,Matt Dobbs,M. Fandino,A. Gilbert,Deborah C. Good,Mark Halpern,David Hanna,Adam D. Hincks,Gary Hinshaw,C. Höfer,Andre M. Johnson,T. L. Landecker,Kiyoshi Masui,Juan Mena Parra,Niels Oppermann,Ue-Li Pen,Jeffrey B. Peterson,Andre Recnik,Timothy Robishaw,J. Richard Shaw,Seth Siegel,Kris Sigurdson,Kendrick M. Smith,Emilie Storer,I. Tretyakov,Kwinten Van Gassen,Keith Vanderlinde,Donald Wiebe +34 more
TL;DR: In this paper, a holography instrument and a technique for mapping the CHIME Pathfinder beams is presented. But this method is not suitable for the DRAO John A. Galt 26 m telescope.
Journal ArticleDOI
Simulated predictions for H I at z = 3.35 with the Ooty Wide Field Array - I. Instrument and the foregrounds
TL;DR: In this article, a multi-frequency angular power spectrum (MAPS) estimator for redshifted HI 21-cm emission from z~3.35 GHz is presented.
Journal ArticleDOI
Improving baryon acoustic oscillation measurement with the combination of cosmic voids and galaxies
Cheng Zhao,Cheng Zhao,Cheng Zhao,Chia-Hsun Chuang,Chia-Hsun Chuang,Francisco-Shu Kitaura,Francisco-Shu Kitaura,Yu Liang,Marcos Pellejero-Ibanez,Marcos Pellejero-Ibanez,Charling Tao,Charling Tao,Mariana Vargas-Magaña,Andrei Variu,Gustavo Yepes +14 more
TL;DR: In this paper, the de-wiggled BAO model was modified with an additional parameter to describe both the BAO peak and the underlying exclusion pattern of void 2PCFs.
References
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