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Title: Anatomy of cosmic tidal reconstruction

Abstract

21-cm intensity surveys aim to map neutral hydrogen atoms in the universe through hyper-fine emission. Unfortunately, long-wavelength (low-wavenumber) radial modes are highly contaminated by smooth astrophysical foregrounds that are six orders of magnitude brighter than the cosmological signal. This contamination also leaks into higher radial and angular wavenumber modes and forms a foreground wedge. Cosmic tidal reconstruction aims to extract the large-scale signal from anisotropic features in the local small-scale power spectrum through non-linear tidal interactions; losing small-scale modes to foreground wedge will impair its performance. In this paper, we review tidal interaction theory and estimator construction, and derive the theoretical expressions for the reconstructed spectra. We show the reconstruction is robust against peculiar velocities. Removing low line-of-sight k modes, we demonstrate cross-correlation coefficient r is greater than 0.7 on large scales (k ≲ 0.1 h Mpc-1) even with a cut-off value |$$k^c_{\Vert }=0.1$$|h Mpc-1. Discarding wedge modes yields 0.3 ≲ r ≲ 0.5 and completely removes the dependency on |$$k^c_{\Vert }$$|. Our theoretical predictions agree with these numerical simulations.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Department of Physics, Yale University, New Haven, CT 06511, USA
  2. Department of Physics, Yale University, New Haven, CT 06511, USA, Department of Astronomy, Yale University, New Haven, CT 06511, USA
Publication Date:
Research Org.:
Yale Univ., New Haven, CT (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1510540
Alternate Identifier(s):
OSTI ID: 1612739
Grant/Contract Number:  
SC0017660
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 486 Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United Kingdom
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; methods: data analysis; cosmology: theory; large-scale structure of Universe

Citation Formats

Karaçaylı, Naim Göksel, and Padmanabhan, Nikhil. Anatomy of cosmic tidal reconstruction. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz964.
Karaçaylı, Naim Göksel, & Padmanabhan, Nikhil. Anatomy of cosmic tidal reconstruction. United Kingdom. doi:10.1093/mnras/stz964.
Karaçaylı, Naim Göksel, and Padmanabhan, Nikhil. Fri . "Anatomy of cosmic tidal reconstruction". United Kingdom. doi:10.1093/mnras/stz964.
@article{osti_1510540,
title = {Anatomy of cosmic tidal reconstruction},
author = {Karaçaylı, Naim Göksel and Padmanabhan, Nikhil},
abstractNote = {21-cm intensity surveys aim to map neutral hydrogen atoms in the universe through hyper-fine emission. Unfortunately, long-wavelength (low-wavenumber) radial modes are highly contaminated by smooth astrophysical foregrounds that are six orders of magnitude brighter than the cosmological signal. This contamination also leaks into higher radial and angular wavenumber modes and forms a foreground wedge. Cosmic tidal reconstruction aims to extract the large-scale signal from anisotropic features in the local small-scale power spectrum through non-linear tidal interactions; losing small-scale modes to foreground wedge will impair its performance. In this paper, we review tidal interaction theory and estimator construction, and derive the theoretical expressions for the reconstructed spectra. We show the reconstruction is robust against peculiar velocities. Removing low line-of-sight k modes, we demonstrate cross-correlation coefficient r is greater than 0.7 on large scales (k ≲ 0.1 h Mpc-1) even with a cut-off value |$k^c_{\Vert }=0.1$|h Mpc-1. Discarding wedge modes yields 0.3 ≲ r ≲ 0.5 and completely removes the dependency on |$k^c_{\Vert }$|. Our theoretical predictions agree with these numerical simulations.},
doi = {10.1093/mnras/stz964},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 486,
place = {United Kingdom},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1093/mnras/stz964

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Cited by: 2 works
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