Steven Cunnington
Jodrell Bank Centre for Astrophysics, University of Manchester

Abstract
Measuring fluctuations spanning "ultra-large" scales (>~100Mpc/h) in cosmic large-scale structure provides an opportunity to test the standard model of cosmology and seek evidence of new physics.
Wide-sky surveys with radio telescopes such as the Square Kilometre Array Observatory (SKAO) will map unexplored scales and depths in the Universe. This will be achieved by surveying diffuse 21cm emission from extragalactic neutral hydrogen (HI), a technique known as HI intensity mapping. This will be a primary aim for the future SKAO once constructed. However, the 64-dish precursor, MeerKAT, is already providing surveys that will grow into competitive spectroscopic volumes (~10,000 square degrees, 0.4 < z < 1.45) over the next few years. I will present early detections of cosmological signal using HI intensity mapping with a multi-dish array. This detection using MeerKAT validates the “single-dish” intensity mapping technique, which the full SKAO will rely on to probe ultra-large scales. These results mark important milestones in the roadmap for the cosmology science case with the full SKAO, the construction of which is entering an exciting phase.

2024 December 06, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
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