First steps toward probing ultra-large-scales with the SKAO

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• Steven Cunnington (Manchester)
• Monday 13 March 2023, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Inigo Zubeldia.

Wide-sky surveys with radio telescopes such as the Square Kilometre Array Observatory (SKAO) will soon be competing to lead the way in probing density fluctuations on the largest scales in the late 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, pathfinder experiments such as the 64-dish MeerKAT telescope are already operational and will provide spectroscopic surveys with competitive volumes. I will present the first detection of cosmological signal using HI intensity mapping with a multi-dish array. This detection was achieved by cross-correlating MeerKAT pilot survey intensity maps with overlapping optical galaxies from the WiggleZ Dark Energy Survey. A measurement of the power spectrum between these fields provided a 7.7σ detection of a cross-correlation. This detection is the first practical demonstration of the multi-dish intensity mapping technique, crucial for the SKAO ’s capability to probe ultra-large scales. This marks an important milestone in the roadmap for the cosmology science case with the full SKAO . I will discuss the cosmological science goals with MeerKAT and also look ahead to what can be achieved with the SKAO .

This talk is part of the Cosmology Lunch series.

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