Cosmological parameter forecasts for HI intensity mapping experiments using the angular power spectrum

Abstract

HI intensity mapping is a new observational technique to survey the large-scale structure of matter using the 21 cm emission line of atomic hydrogen (HI). In this work, we simulate BINGO (BAO from Integrated Neutral Gas Observations) and SKA (Square Kilometre Array) phase-1 dish array operating in auto-correlation mode. For the optimal case of BINGO with no foregrounds, the combination of the HI angular power spectra with Planck results allows $w$ to be measured with a precision of $4\%$, while the combination of the BAO acoustic scale with Planck gives a precision of $7\%$. We consider a number of potentially complicating effects, including foregrounds and redshift dependent bias, which increase the uncertainty on $w$ but not dramatically; in all cases the final uncertainty is found to be $\Delta w<8\%$ for BINGO. For the combination of SKA-MID in auto-correlation mode with Planck, we find that, in ideal conditions, $w$ can be measured with a precision of $4\%$ for the redshift range $0.35<z<3$ (i.e., for the bandwidth of $\Delta \nu =[350,1050]$ MHz) and $2\%$ for $0<z<0.49$ (i.e., $\Delta \nu =[950,1421]$ MHz). Extending the model to include the sum of neutrino masses yields a $95\%$ upper limit of $\sum m_{\nu }<0.24$ eV for BINGO and $\sum m_{\nu }<0.08$ eV for SKA phase 1, competitive with the current best constraints in the case of BINGO and significantly better than them in the case of SKA.

18 pages, 7 figures, 6 tables. Updated to match version accepted by MNRAS

References in corpus (18)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Extended Limber Approximation
• Report of the Dark Energy Task Force
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Late-time cosmology with 21cm intensity mapping experiments
• Separation of anomalous and synchrotron emissions using WMAP polarization data
• Possibility of Precise Measurement of the Cosmological Power Spectrum With a Dedicated 21cm Survey After Reionization
• The Neutral Hydrogen Cosmological Mass Density at z=5
• Testing General Relativity with 21 cm intensity mapping
• The Tianlai project: a 21cm cosmology experiment
• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• Blind foreground subtraction for intensity mapping experiments
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Polarization
• Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements
• Baryonic acoustic oscillations from 21cm intensity mapping: the Square Kilometre Array case
• Theoretical and observational constraints on the HI intensity power spectrum
• A scale dependent bias on linear scales: the case for HI intensity mapping at z=1
• BINGO - A novel method to detect BAOs using a total-power radio telescope

Cited by in corpus (1)

• Recovery of 21 cm intensity maps with sparse component separation