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SUMMARY:First steps toward probing ultra-large-scales with the SKAO - Stev
 en Cunnington (Manchester)
DTSTART:20230313T130000Z
DTEND:20230313T140000Z
UID:TALK196870@talks.cam.ac.uk
CONTACT:Inigo Zubeldia
DESCRIPTION:Wide-sky surveys with radio telescopes such as the Square Kilo
 metre Array Observatory (SKAO) will soon be competing to lead the way in p
 robing density fluctuations on the largest scales in the late Universe. Th
 is will be achieved by surveying diffuse 21cm emission from extragalactic 
 neutral hydrogen (HI)\, a technique known as HI intensity mapping. This wi
 ll be a primary aim for the future SKAO once constructed. However\, pathfi
 nder experiments such as the 64-dish MeerKAT telescope are already operati
 onal and will provide spectroscopic surveys with competitive volumes. I wi
 ll present the first detection of cosmological signal using HI intensity m
 apping with a multi-dish array. This detection was achieved by cross-corre
 lating MeerKAT pilot survey intensity maps with overlapping optical galaxi
 es from the WiggleZ Dark Energy Survey. A measurement of the power spectru
 m between these fields provided a 7.7σ detection of a cross-correlation. 
 This detection is the first practical demonstration of the multi-dish inte
 nsity mapping technique\, crucial for the SKAO's capability to probe ultra
 -large scales. This marks an important milestone in the roadmap for the co
 smology science case with the full SKAO. I will discuss the cosmological s
 cience goals with MeerKAT and also look ahead to what can be achieved with
  the SKAO.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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