Galaxy Evolution and Cosmology with the Square Kilometre Array

Abstract

The present-day Universe is seemingly dominated by dark energy and dark matter, but mapping the normal (baryonic) content remains vital for both astrophysics - understanding how galaxies form - and astro-particle physics - inferring properties of the dark components. The Square Kilometre Array (SKA) will provide the only means of studying the cosmic evolution of neutral Hydrogen (HI) which, alongside information on star formation from the radio continuum, is needed to understand how stars formed from gas within dark-matter over-densities and the roles of gas accretion and galaxy merging. `All hemisphere' HI redshift surveys to redshift 1.5 are feasible with wide-field-of-view realizations of the SKA and, by measuring the galaxy power spectrum in exquisite detail, will allow the first precise studies of the equation-of-state of dark energy. The SKA will be capable of other uniquely powerful cosmological studies including the measurement of the dark-matter power spectrum using weak gravitational lensing, and the precise measurement of H0 using extragalactic water masers. The SKA is likely to become the premier dark-energy-measuring machine, bringing breakthroughs in cosmology beyond those likely to be made possible by combining CMB (e.g. Planck), optical (e.g. LSST, SNAP) and other early-21st-century datasets.

15 pages, 7 figures, to appear in "Science with the Square Kilometer Array", eds.C. Carilli and S. Rawlings, New Astronomy Reviews (Elsevier: Amsterdam)

References in corpus (7)

• The HIPASS Catalogue - I. Data Presentation
• The accretion history of the Universe with the SKA
• Cosmology with the Square Kilometre Array
• 21 cm Absorption Studies with the Square Kilometer Array
• Measuring Changes in the Fundamental Constants with Redshifted Radio Absorption Lines
• Extragalactic Water Masers, Geometric Estimation of H_o and Characterization of Dark Energy
• From gas to galaxies

Cited by in corpus (20)

• Cosmology and Fundamental Physics with the Euclid Satellite
• Cosmology and fundamental physics with the Euclid satellite
• Reionization and Cosmology with 21 cm Fluctuations
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• Detection of large scale intrinsic ellipticity-density correlation from the Sloan Digital Sky Survey and implications for weak lensing surveys
• Features and New Physical Scales in Primordial Observables: Theory and Observation
• On using angular cross-correlations to determine source redshift distributions
• Forecasts on the Dark Energy and Primordial Non-Gaussianity Observations with the Tianlai Cylinder Array
• Linked evolution of gas and star formation in galaxies over cosmic history
• Forecasts for Dark Energy Measurements with Future HI Surveys
• A comparative study of intervening and associated HI 21-cm absorption profiles in redshifted galaxies
• Cosmological shock waves: clues to the formation history of haloes
• Parallel faceted imaging in radio interferometry via proximal splitting (Faceted HyperSARA): I. Algorithm and simulations
• The renormalization of the energy-momentum tensor for an effective initial state
• A search for HI and OH absorption in z > 3 CO emitters
• Strongly lensed neutral hydrogen emission: detection predictions with current and future radio interferometers
• The Square Kilometre Array: A new probe of cosmic magnetism
• EMBRACE@Nancay: An Ultra Wide Field of View Prototype for the SKA
• Complementarity of Future Dark Energy Probes
• The multi-wavelength Tully-Fisher relation in the TNG50 cosmological simulation