Forecasts for Dark Energy Measurements with Future HI Surveys

Abstract

We use two independent methods to forecast the dark energy measurements achievable by combining future galaxy redshift surveys based on the radio HI emission line with Cosmic Microwave Background (CMB) data from the {\sl Planck} satellite. In the first method we focus on the `standard ruler' provided by the baryon acoustic oscillation (BAO) length scale. In the second method we utilize additional information encoded in the galaxy power spectrum including galaxy bias from velocity-space distortions and the growth of cosmic structure. We find that a radio synthesis array with about 10 per cent of the collecting area of the Square Kilometre Array (SKA), equipped with a wide ($10-100{\mathrm{deg}}^2$) field-of-view, would have the capacity to perform a $20,000{\mathrm{deg}}^2$ redshift survey to a maximum redshift $z_{\max }\sim 0.8$ and thereby produce dark energy measurements that are competitive with surveys likely to be undertaken by optical telescopes around 2015. There would then be powerful arguments for adding collecting area to such a `Phase-1' SKA because of the square-law scaling of survey speed with telescope sensitivity for HI surveys, compared to the linear scaling for optical redshift surveys. The full SKA telescope should, by performing a $20,000{\mathrm{deg}}^2$ HI redshift survey to $z_{\max }\sim 2$ around 2020, yield an accurate measurement of cosmological parameters independent of CMB datasets. Combining CMB ({\sl Planck}) and galaxy power spectrum (SKA) measurements will drive errors in the dark energy equation-of-state parameter $w$ well below the 1 per cent level. The major systematic uncertainty in these forecasts is the lack of direct information about the mass function of high-redshift HI-emitting galaxies.

19 pages; 2 tables; 18 figures. accepted by MNRAS

References in corpus (22)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• Testing cosmological structure formation using redshift-space distortions
• The shape of the SDSS DR5 galaxy power spectrum
• Simulation of the Cosmic Evolution of Atomic and Molecular Hydrogen in Galaxies
• A high redshift detection of the integrated Sachs-Wolfe effect
• Measuring the matter density using baryon oscillations in the SDSS
• Cross-correlation of WMAP 3rd year and the SDSS DR4 galaxy survey: new evidence for Dark Energy
• Understanding the H2/HI Ratio in Galaxies
• WSRT Ultra-Deep Neutral Hydrogen Imaging of Galaxy Clusters at z=0.2, a Pilot Survey of Abell 963 and Abell 2192
• Cross-correlation of 2MASS and WMAP3: Implications for the Integrated Sachs-Wolfe effect
• A Pilot Survey of HI in Field Galaxies at Redshift z~0.2
• Galaxy redshift surveys selected by neutral hydrogen using FAST
• Large scale structure in the HI Parkes All-Sky Survey: Filling the Voids with HI galaxies?
• Cosmology with the Square Kilometre Array
• Dust Biasing of Damped Lyman Alpha Systems: a Bayesian Analysis
• The Redshift Sensitivities of Dark Energy Surveys
• Determining neutrino properties using future galaxy redshift surveys
• The 6C** sample of steep-spectrum radio sources: II - Redshift distribution and the space density of high-redshift radio galaxies

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• Cosmological performance of SKA HI galaxy surveys
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• Forecasting neutrino masses from galaxy clustering in the Dark Energy Survey combined with the Planck Measurements
• Large Scale Structure Forecast Constraints on Particle Production During Inflation
• Weak lensing reconstruction through cosmic magnification. II. Improved power spectrum determination and map-making
• Elucidating Dark Energy with Future 21 cm Observations at the Epoch of Reionization
• Baryon Acoustic Oscillations from Integrated Neutral Gas Observations: an instrument to observe the 21cm hydrogen line in the redshift range 0.13 $<$ z $<$ 0.45 -- status update
• A cosmic speed-trap: a gravity-independent test of cosmic acceleration using baryon acoustic oscillations