Galaxy redshift surveys selected by neutral hydrogen using FAST

Abstract

We discuss the possibility of performing a substantial spectroscopic galaxy redshift survey selected via the 21cm emission from neutral hydrogen using the Five-hundred metre Aperture Spherical Telescope (FAST) to be built in China. We consider issues related to the estimation of the source counts and optimizations of the survey, and discuss the constraints on cosmological models that such a survey could provide. We find that a survey taking around two years could detect ~10^7 galaxies with an average redshift of ~0.15 making the survey complementary to those already carried out at optical wavelengths. These conservative estimates have used the z=0 HI mass function and have ignored the possibility of evolution. The results could be used to constrain Gamma = (Omega_m h) to 5 per cent and the spectral index, n_s, to 7 per cent independent of cosmic microwave background data. If we also use simulated power spectra from the Planck satellite, we can constrain w to be within 5 per cent of -1.

13 pages, 15 figures, Accepted by MNRAS, minor corrections

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Cited by in corpus (28)

• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• Considerations for a Multi-beam Multi-purpose Survey with FAST
• HI intensity mapping : a single dish approach
• Impact of Cluster Physics on the Sunyaev-Zel'dovich Power Spectrum
• Predictions for ASKAP Neutral Hydrogen Surveys
• Modelling neutral hydrogen in galaxies using cosmological hydrodynamical simulations
• Extragalactic HI Surveys
• Forecast for FAST: from Galaxies Survey to Intensity Mapping
• Cosmological surveys with the Australian Square Kilometre Array Pathfinder
• Constraints on the optical depth of galaxy groups and clusters
• Forecasts for Dark Energy Measurements with Future HI Surveys
• An accurate low-redshift measurement of the cosmic neutral hydrogen density
• A Simple Empirically Motivated Template for the Unresolved Thermal Sunyaev-Zeldovich Effect
• 21 cm intensity mapping with the Five hundred metre Aperture Spherical Telescope
• X-ray and SZ constraints on the properties of hot CGM
• Modeling Extragalactic Foregrounds and Secondaries for Unbiased Estimation of Cosmological Parameters From Primary CMB Anisotropy
• Astrophysical searches for a hidden-photon signal in the radio regime
• The cosmic atomic hydrogen mass density as a function of mass and galaxy hierarchy from spectral stacking
• Predictions for the FAST telescope's CRAFTS Extra-Galactic HI Survey
• CMB distortion from circumgalactic gas
• HiFAST : An HI Data Calibration and Imaging Pipeline for FAST II. Flux Density Calibration
• Probing the circumgalactic baryons through cross-correlations
• The Atomic Hydrogen Content of Galaxies as a function of Group-Centric Radius
• Interferometric Cubelet Stacking to Recover H\,\textsc{i} Emission from Distant Galaxies
• Probing satellite galaxies in the Local Group by using FAST
• Constraining the X-ray AGN halo occupation distribution: implications for eROSITA
• HI-bearing dark galaxies predictions from constrained Local Group simulations: how many and where to find them
• Exploring HI Galaxy Redshift Survey Strategies for the FAST Core Array Interferometry