Cosmological performance of SKA HI galaxy surveys

S. Yahya; P. Bull; M. G. Santos; M. Silva; R. Maartens; P. Okouma; B. Bassett

doi:10.1093/mnras/stv695

Cosmological performance of SKA HI galaxy surveys

S. Yahya^*, P. Bull, M. G. Santos, M. Silva, R. Maartens, P. Okouma, B. Bassett

^*Corresponding author for this work

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Abstract

The Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21 cm emission line of neutral hydrogen (H I) from around a billion galaxies over 3/4 of the sky, out to a redshift of z ~ 2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA configurations. We illustrate the relative performance of the different surveys by forecasting errors on the radial and transverse scales of the baryon acoustic oscillation (BAO) feature, finding that the full 'billion galaxy survey' with SKA2 will deliver the largest dark energy Figure of Merit of any current or future large-scale structure survey.

Original language	English
Pages (from-to)	2251-2260
Journal	Monthly Notices of the Royal Astronomical Society
Volume	450
Issue number	3
Early online date	6 May 2015
DOIs	https://doi.org/10.1093/mnras/stv695
Publication status	Published - 1 Jul 2015

Keywords

Dark energy
RCUK
STFC
ST/K0090X/1

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1412.4700Accepted author manuscript (Post-print), 1.61 MB

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abstract = "The Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21 cm emission line of neutral hydrogen (H I) from around a billion galaxies over 3/4 of the sky, out to a redshift of z ~ 2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA configurations. We illustrate the relative performance of the different surveys by forecasting errors on the radial and transverse scales of the baryon acoustic oscillation (BAO) feature, finding that the full 'billion galaxy survey' with SKA2 will deliver the largest dark energy Figure of Merit of any current or future large-scale structure survey.",

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AU - Yahya, S.

AU - Bull, P.

AU - Santos, M. G.

AU - Silva, M.

AU - Maartens, R.

AU - Okouma, P.

AU - Bassett, B.

PY - 2015/7/1

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N2 - The Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21 cm emission line of neutral hydrogen (H I) from around a billion galaxies over 3/4 of the sky, out to a redshift of z ~ 2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA configurations. We illustrate the relative performance of the different surveys by forecasting errors on the radial and transverse scales of the baryon acoustic oscillation (BAO) feature, finding that the full 'billion galaxy survey' with SKA2 will deliver the largest dark energy Figure of Merit of any current or future large-scale structure survey.

AB - The Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21 cm emission line of neutral hydrogen (H I) from around a billion galaxies over 3/4 of the sky, out to a redshift of z ~ 2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA configurations. We illustrate the relative performance of the different surveys by forecasting errors on the radial and transverse scales of the baryon acoustic oscillation (BAO) feature, finding that the full 'billion galaxy survey' with SKA2 will deliver the largest dark energy Figure of Merit of any current or future large-scale structure survey.

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Cosmological performance of SKA HI galaxy surveys

Abstract

Keywords

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