Open AccessPosted Content
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
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Multipole expansion for H I intensity mapping experiments: simulations and modelling
Steven Cunnington,Steven Cunnington,Alkistis Pourtsidou,Alkistis Pourtsidou,Paula S. Soares,Chris Blake,David Bacon +6 more
TL;DR: In this article, a framework and an open-source python toolkit are presented to analyse the 2-point statistics of 3D fluctuations in the context of HI intensity maps using the multipole expansion formalism.
Journal ArticleDOI
Extreme spheres: counts-in-cells for 21cm intensity mapping
Oliver Leicht,Cora Uhlemann,Francisco Villaescusa-Navarro,Sandrine Codis,Lars Hernquist,Shy Genel,Shy Genel +6 more
TL;DR: In this article, the authors used a large state-of-the-art magneto-hydrodynamic simulation from the IllustrisTNG project to determine the relation between neutral hydrogen and matter densities in cells.
Journal ArticleDOI
Signatures of the Baryon acoustic oscillations on the convergence power spectrum of weak lensing by large scale structure
TL;DR: In this paper, the authors employ an analytical approach to investigate the signatures of Baryon acoustic oscillations (BAOs) on the convergence power spectrum of weak lensing by large scale structure.
Posted Content
Progress in the Construction and Testing of the Tianlai Radio Interferometers
Santanu Das,Christopher J. Anderson,Reza Ansari,J.E. Campagne,Daniel Charlet,Xuelei Chen,Zhiping Chen,Aleksander J. Cianciara,Pierre Colom,Yanping Cong,Kevin G. Gayley,Jingchao Geng,Jie Hao,Qizhi Huang,Celeste S. Keith,Chao Li,Jixia Li,Yichao Li,Liu Chao,Tao Liu,Christophe Magneville,John Marriner,Jean Michel Martin,Marc Moniez,Trevor M. Oxholm,Ue-Li Pen,Olivier Perdereau,Jeffrey B. Peterson,Huli Shi,Shu Lin,Albert Stebbins,Shijie Sun,Peter Timbie,Steve Torchinsky,Gregory S. Tucker,Guisong Wang,Rongli Wang,Xin Wang,Yougang Wang,Fengquan Wu,Yidong Xu,Kaifeng Yu,Jiao Zhang,Juyong Zhang,Le Zhang,Jialu Zhu,Shifan Zuo +46 more
TL;DR: The Tianlai Pathfinder as discussed by the authors is a radio interferometer-based array of three 15m + 40m cylinder telescopes and sixteen 6m diameter dish antennas located in a radio-quiet part of western China.
Journal ArticleDOI
A high-resolution self-consistent whole sky foreground model
TL;DR: In this article, a high resolution self-consistent sky model at low frequencies, which incorporates both diffuse foreground and point sources, is constructed by generating physical foreground components including the galactic synchrotron emission and galactic free-free emission.
References
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