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Title: Cosmic reionization on computers. Mean and fluctuating redshifted 21 CM signal

Abstract

We explore the mean and fluctuating redshifted 21 cm signal in numerical simulations from the Cosmic Reionization On Computers project. We find that the mean signal varies between about ±25 mK. Most significantly, we find that the negative pre-reionization dip at z ~ 10–15 only extends to $$\langle {\rm{\Delta }}{T}_{B}\rangle \sim -25\,{\rm{mK}}$$, requiring substantially higher sensitivity from global signal experiments that operate in this redshift range (EDGES-II, LEDA, SCI-HI, and DARE) than has often been assumed previously. We also explore the role of dense substructure (filaments and embedded galaxies) in the formation of the 21 cm power spectrum. We find that by neglecting the semi-neutral substructure inside ionized bubbles, the power spectrum can be misestimated by 25%–50% at scales k ~ 0.1–1h Mpc–1. Furthermore, this scale range is of particular interest, because the upcoming 21 cm experiments (Murchison Widefield Array, Precision Array for Probing the Epoch of Reionization, Hydrogen Epoch of Reionization Array) are expected to be most sensitive within it.

Authors:
ORCiD logo [1];  [2]
  1. Univ. of Chicago, Chicago, IL (United States)
  2. Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1275509
Report Number(s):
FERMILAB-PUB-15-493-A; arXiv:1510.08767
Journal ID: ISSN 1538-4357; 1401347
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 824; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: theory; methods: numerical; intergalactic medium

Citation Formats

Kaurov, Alexander A., and Gnedin, Nickolay Y. Cosmic reionization on computers. Mean and fluctuating redshifted 21 CM signal. United States: N. p., 2016. Web. doi:10.3847/0004-637X/824/2/114.
Kaurov, Alexander A., & Gnedin, Nickolay Y. Cosmic reionization on computers. Mean and fluctuating redshifted 21 CM signal. United States. https://doi.org/10.3847/0004-637X/824/2/114
Kaurov, Alexander A., and Gnedin, Nickolay Y. Mon . "Cosmic reionization on computers. Mean and fluctuating redshifted 21 CM signal". United States. https://doi.org/10.3847/0004-637X/824/2/114. https://www.osti.gov/servlets/purl/1275509.
@article{osti_1275509,
title = {Cosmic reionization on computers. Mean and fluctuating redshifted 21 CM signal},
author = {Kaurov, Alexander A. and Gnedin, Nickolay Y.},
abstractNote = {We explore the mean and fluctuating redshifted 21 cm signal in numerical simulations from the Cosmic Reionization On Computers project. We find that the mean signal varies between about ±25 mK. Most significantly, we find that the negative pre-reionization dip at z ~ 10–15 only extends to $\langle {\rm{\Delta }}{T}_{B}\rangle \sim -25\,{\rm{mK}}$, requiring substantially higher sensitivity from global signal experiments that operate in this redshift range (EDGES-II, LEDA, SCI-HI, and DARE) than has often been assumed previously. We also explore the role of dense substructure (filaments and embedded galaxies) in the formation of the 21 cm power spectrum. We find that by neglecting the semi-neutral substructure inside ionized bubbles, the power spectrum can be misestimated by 25%–50% at scales k ~ 0.1–1h Mpc–1. Furthermore, this scale range is of particular interest, because the upcoming 21 cm experiments (Murchison Widefield Array, Precision Array for Probing the Epoch of Reionization, Hydrogen Epoch of Reionization Array) are expected to be most sensitive within it.},
doi = {10.3847/0004-637X/824/2/114},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 824,
place = {United States},
year = {2016},
month = {6}
}

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Works referencing / citing this record:

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