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Title: Baryon Acoustic Oscillations reconstruction with pixels

Abstract

Gravitational non-linear evolution induces a shift in the position of the baryon acoustic oscillations (BAO) peak together with a damping and broadening of its shape that bias and degrades the accuracy with which the position of the peak can be determined. BAO reconstruction is a technique developed to undo part of the effect of non-linearities. We present and analyse a reconstruction method that consists of displacing pixels instead of galaxies and whose implementation is easier than the standard reconstruction method. We show that this method is equivalent to the standard reconstruction technique in the limit where the number of pixels becomes very large. This method is particularly useful in surveys where individual galaxies are not resolved, as in 21cm intensity mapping observations. We validate this method by reconstructing mock pixelated maps, that we build from the distribution of matter and halos in real- and redshift-space, from a large set of numerical simulations. We find that this method is able to decrease the uncertainty in the BAO peak position by 30-50% over the typical angular resolution scales of 21 cm intensity mapping experiments.

Authors:
 [1];  [2];  [3];  [4]
  1. SISSA—International School for Advanced Studies, Via Bonomea 265, 34136 Trieste (Italy)
  2. Center for Computational Astrophysics, 160 5th Ave, New York, NY, 10010 (United States)
  3. Berkeley Center for Cosmological Physics, University of California, Berkeley, CA 94720 (United States)
  4. INAF, Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34131 Trieste (Italy)
Publication Date:
OSTI Identifier:
22667698
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; BARYONS; COMPUTERIZED SIMULATION; DISTRIBUTION; GALAXIES; NONLINEAR PROBLEMS; OSCILLATIONS; RED SHIFT; RESOLUTION; SPACE

Citation Formats

Obuljen, Andrej, Villaescusa-Navarro, Francisco, Castorina, Emanuele, and Viel, Matteo, E-mail: aobuljen@sissa.it, E-mail: fvillaescusa@simonsfoundation.org, E-mail: ecastorina@berkeley.edu, E-mail: viel@oats.inaf.it. Baryon Acoustic Oscillations reconstruction with pixels. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/09/012.
Obuljen, Andrej, Villaescusa-Navarro, Francisco, Castorina, Emanuele, & Viel, Matteo, E-mail: aobuljen@sissa.it, E-mail: fvillaescusa@simonsfoundation.org, E-mail: ecastorina@berkeley.edu, E-mail: viel@oats.inaf.it. Baryon Acoustic Oscillations reconstruction with pixels. United States. doi:10.1088/1475-7516/2017/09/012.
Obuljen, Andrej, Villaescusa-Navarro, Francisco, Castorina, Emanuele, and Viel, Matteo, E-mail: aobuljen@sissa.it, E-mail: fvillaescusa@simonsfoundation.org, E-mail: ecastorina@berkeley.edu, E-mail: viel@oats.inaf.it. Fri . "Baryon Acoustic Oscillations reconstruction with pixels". United States. doi:10.1088/1475-7516/2017/09/012.
@article{osti_22667698,
title = {Baryon Acoustic Oscillations reconstruction with pixels},
author = {Obuljen, Andrej and Villaescusa-Navarro, Francisco and Castorina, Emanuele and Viel, Matteo, E-mail: aobuljen@sissa.it, E-mail: fvillaescusa@simonsfoundation.org, E-mail: ecastorina@berkeley.edu, E-mail: viel@oats.inaf.it},
abstractNote = {Gravitational non-linear evolution induces a shift in the position of the baryon acoustic oscillations (BAO) peak together with a damping and broadening of its shape that bias and degrades the accuracy with which the position of the peak can be determined. BAO reconstruction is a technique developed to undo part of the effect of non-linearities. We present and analyse a reconstruction method that consists of displacing pixels instead of galaxies and whose implementation is easier than the standard reconstruction method. We show that this method is equivalent to the standard reconstruction technique in the limit where the number of pixels becomes very large. This method is particularly useful in surveys where individual galaxies are not resolved, as in 21cm intensity mapping observations. We validate this method by reconstructing mock pixelated maps, that we build from the distribution of matter and halos in real- and redshift-space, from a large set of numerical simulations. We find that this method is able to decrease the uncertainty in the BAO peak position by 30-50% over the typical angular resolution scales of 21 cm intensity mapping experiments.},
doi = {10.1088/1475-7516/2017/09/012},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 09,
volume = 2017,
place = {United States},
year = {2017},
month = {9}
}