Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..701v&link_type=abstract
SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The international radio astronomy community is working towards the giant SKA (Square Kilometre Array) radio synthesis telescope operational by 2020 in the ~0.15-25 GHz frequency range. It will be a hundred times more sensitive for line observations than the largest telescopes currently operational at these frequencies, with a resolution of a milliarcsec at 20 GHz. It will provide breakthroughs in cosmology, due to its unprecedented sensitivity and its large-field of view imaging capabilities. Of prime interest to the cosmology community among the SKA Key Science Projects (KSPs) are KSP IV (Galaxy evolution and cosmology) on galaxy evolution studies using 21cm HI line observations of the most abundant element, neutral atomic Hydrogen, in a billion galaxies out to z˜ 1.5 over the entire sky, measuring the dark energy equation of state w parameters to 1% accuracy without degeneracy and measuring the Hubble constant with 1% uncertainty, and KSP V (Probing the dark ages) on using 21cm HI emission and absorption observations to study ionisation as function of z at redshifts corresponding to the Epoch of Reionisation, to detect EoR (z>6) galaxies in the CO(1-0) line, and to detect the first (z>10) AGNs in radio continuum.
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