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Title: Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era

Abstract

We investigate the cross-correlation between the spatial distribution of Lyman Break Galaxies (LBGs) and the 21cm intensity mapping signal at z∼[3–5]. At these redshifts, galactic feedback is supposed to only marginally affect the matter power spectrum, and the neutral hydrogen distribution is independently constrained by quasar spectra. Using a high resolution N-body simulation, populated with neutral hydrogen a posteriori, we forecast for the expected LBG-21cm cross-spectrum and its error for a 21cm field observed by the Square Kilometre Array (SKA1-LOW and SKA1-MID), combined with a spectroscopic LBG survey with the same volume. The cross power can be detected with a signal-to-noise ratio (SNR) up to ∼10 times higher (and down to ∼ 4 times smaller scales) than the 21cm auto-spectrum for this set-up, with the SNR depending only very weakly on redshift and the LBG population. We also show that while both the 21cm auto- and LBG-21cm cross-spectra can be reliably recovered after the cleaning of smooth-spectrum foreground contamination, only the cross-power is robust to problematic non-smooth foregrounds like polarized synchrotron emission.

Authors:
;  [1];  [2];  [3];  [4];  [5]
  1. INAF—Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34143, Trieste (Italy)
  2. Astrophysics Department, University of Oxford, DWB, Keble Road, Oxford OX1 3RH (United Kingdom)
  3. Department of Physics, Presidency University, 86/1 College Street, Kolkata -700073 (India)
  4. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo (Norway)
  5. Department of Physics, University of Western Cape, Cape Town 7535 (South Africa)
Publication Date:
OSTI Identifier:
22525939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; CORRELATIONS; FEEDBACK; GALAXIES; HYDROGEN; MAPPING; QUASARS; RED SHIFT; RESOLUTION; SIGNAL-TO-NOISE RATIO; SPATIAL DISTRIBUTION

Citation Formats

Villaescusa-Navarro, Francisco, Viel, Matteo, Alonso, David, Datta, Kanan K., Bull, Philip, and Santos, Mário G., E-mail: villaescusa@oats.inaf.it, E-mail: viel@oats.inaf.it, E-mail: david.alonso@astro.ox.ac.uk, E-mail: kanan@ncra.tifr.res.in, E-mail: p.j.bull@astro.uio.no, E-mail: mgrsantos@uwc.ac.za. Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/03/034.
Villaescusa-Navarro, Francisco, Viel, Matteo, Alonso, David, Datta, Kanan K., Bull, Philip, & Santos, Mário G., E-mail: villaescusa@oats.inaf.it, E-mail: viel@oats.inaf.it, E-mail: david.alonso@astro.ox.ac.uk, E-mail: kanan@ncra.tifr.res.in, E-mail: p.j.bull@astro.uio.no, E-mail: mgrsantos@uwc.ac.za. Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era. United States. doi:10.1088/1475-7516/2015/03/034.
Villaescusa-Navarro, Francisco, Viel, Matteo, Alonso, David, Datta, Kanan K., Bull, Philip, and Santos, Mário G., E-mail: villaescusa@oats.inaf.it, E-mail: viel@oats.inaf.it, E-mail: david.alonso@astro.ox.ac.uk, E-mail: kanan@ncra.tifr.res.in, E-mail: p.j.bull@astro.uio.no, E-mail: mgrsantos@uwc.ac.za. Sun . "Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era". United States. doi:10.1088/1475-7516/2015/03/034.
@article{osti_22525939,
title = {Cross-correlating 21cm intensity maps with Lyman Break Galaxies in the post-reionization era},
author = {Villaescusa-Navarro, Francisco and Viel, Matteo and Alonso, David and Datta, Kanan K. and Bull, Philip and Santos, Mário G., E-mail: villaescusa@oats.inaf.it, E-mail: viel@oats.inaf.it, E-mail: david.alonso@astro.ox.ac.uk, E-mail: kanan@ncra.tifr.res.in, E-mail: p.j.bull@astro.uio.no, E-mail: mgrsantos@uwc.ac.za},
abstractNote = {We investigate the cross-correlation between the spatial distribution of Lyman Break Galaxies (LBGs) and the 21cm intensity mapping signal at z∼[3–5]. At these redshifts, galactic feedback is supposed to only marginally affect the matter power spectrum, and the neutral hydrogen distribution is independently constrained by quasar spectra. Using a high resolution N-body simulation, populated with neutral hydrogen a posteriori, we forecast for the expected LBG-21cm cross-spectrum and its error for a 21cm field observed by the Square Kilometre Array (SKA1-LOW and SKA1-MID), combined with a spectroscopic LBG survey with the same volume. The cross power can be detected with a signal-to-noise ratio (SNR) up to ∼10 times higher (and down to ∼ 4 times smaller scales) than the 21cm auto-spectrum for this set-up, with the SNR depending only very weakly on redshift and the LBG population. We also show that while both the 21cm auto- and LBG-21cm cross-spectra can be reliably recovered after the cleaning of smooth-spectrum foreground contamination, only the cross-power is robust to problematic non-smooth foregrounds like polarized synchrotron emission.},
doi = {10.1088/1475-7516/2015/03/034},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2015,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}