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Title: Reconstructing large-scale structure with neutral hydrogen surveys

Abstract

Upcoming 21-cm intensity surveys will use the hyperfine transition in emission to map out neutral hydrogen in large volumes of the universe. Unfortunately, large spatial scales are completely contaminated with spectrally smooth astrophysical foregrounds which are orders of magnitude brighter than the signal. This contamination also leaks into smaller radial and angular modes to form a foreground wedge, further limiting the usefulness of 21-cm observations for different science cases, especially cross-correlations with tracers that have wide kernels in the radial direction. Here in this paper, we investigate reconstructing these modes within a forward modeling framework. Starting with an initial density field, a suitable bias parameterization and non-linear dynamics to model the observed 21-cm field, our reconstruction proceeds by {combining} the likelihood of a forward simulation to match the observations (under given modeling error and a data noise model) {with the Gaussian prior on initial conditions and maximizing the obtained posterior}. For redshifts z=2 and 4, we are able to reconstruct 21cm field with cross correlation, r c > 0.8 on all scales for both our optimistic and pessimistic assumptions about foreground contamination and for different levels of thermal noise. The performance deteriorates slightly at z=6. The large-scale line-of-sight modes aremore » reconstructed almost perfectly. We demonstrate how our method also provides a technique for density field reconstruction for baryon acoustic oscillations, outperforming standard methods on all scales. We also describe how our reconstructed field can provide superb clustering redshift estimation at high redshifts, where it is otherwise extremely difficult to obtain dense spectroscopic samples, as well as open up a wealth of cross-correlation opportunities with projected fields (e.g. lensing) which are restricted to modes transverse to the line of sight.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics (BCCP)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1593663
Alternate Identifier(s):
OSTI ID: 1598490
Report Number(s):
BNL-213613-2020-JAAM
Journal ID: ISSN 1475-7516
Grant/Contract Number:  
SC0017860; AC02-05CH11231; 1713791; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 11; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; cosmological parameters from LSS; power spectrum; 21 cm; galaxy clustering

Citation Formats

Modi, Chirag, White, Martin, Slosar, Anže, and Castorina, Emanuele. Reconstructing large-scale structure with neutral hydrogen surveys. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/11/023.
Modi, Chirag, White, Martin, Slosar, Anže, & Castorina, Emanuele. Reconstructing large-scale structure with neutral hydrogen surveys. United States. doi:10.1088/1475-7516/2019/11/023.
Modi, Chirag, White, Martin, Slosar, Anže, and Castorina, Emanuele. Wed . "Reconstructing large-scale structure with neutral hydrogen surveys". United States. doi:10.1088/1475-7516/2019/11/023.
@article{osti_1593663,
title = {Reconstructing large-scale structure with neutral hydrogen surveys},
author = {Modi, Chirag and White, Martin and Slosar, Anže and Castorina, Emanuele},
abstractNote = {Upcoming 21-cm intensity surveys will use the hyperfine transition in emission to map out neutral hydrogen in large volumes of the universe. Unfortunately, large spatial scales are completely contaminated with spectrally smooth astrophysical foregrounds which are orders of magnitude brighter than the signal. This contamination also leaks into smaller radial and angular modes to form a foreground wedge, further limiting the usefulness of 21-cm observations for different science cases, especially cross-correlations with tracers that have wide kernels in the radial direction. Here in this paper, we investigate reconstructing these modes within a forward modeling framework. Starting with an initial density field, a suitable bias parameterization and non-linear dynamics to model the observed 21-cm field, our reconstruction proceeds by {combining} the likelihood of a forward simulation to match the observations (under given modeling error and a data noise model) {with the Gaussian prior on initial conditions and maximizing the obtained posterior}. For redshifts z=2 and 4, we are able to reconstruct 21cm field with cross correlation, rc > 0.8 on all scales for both our optimistic and pessimistic assumptions about foreground contamination and for different levels of thermal noise. The performance deteriorates slightly at z=6. The large-scale line-of-sight modes are reconstructed almost perfectly. We demonstrate how our method also provides a technique for density field reconstruction for baryon acoustic oscillations, outperforming standard methods on all scales. We also describe how our reconstructed field can provide superb clustering redshift estimation at high redshifts, where it is otherwise extremely difficult to obtain dense spectroscopic samples, as well as open up a wealth of cross-correlation opportunities with projected fields (e.g. lensing) which are restricted to modes transverse to the line of sight.},
doi = {10.1088/1475-7516/2019/11/023},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 11,
volume = 2019,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
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