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SUMMARY:Constraining star-formation efficiency in the early Universe using
  JWST and the cosmic 21-cm signal - Jiten Dhandha / IoA
DTSTART:20241023T121500Z
DTEND:20241023T124000Z
UID:TALK223267@talks.cam.ac.uk
CONTACT:Xander Byrne
DESCRIPTION:The cosmic 21-cm signal encodes a vast array of information ab
 out the early Universe\, shedding light on the Dark Ages\, the earliest st
 ars and galaxies during the Cosmic Dawn\, and on the tomography of the Epo
 ch of Reionization. Many attempts are being made to capture this unique si
 gnal with increasingly good sensitivity\, through interferometers like HER
 A and NenuFAR\, and monopole antennas like EDGES\, SARAS and REACH. In par
 allel\, the ambitious attempts at peering into deep space through the eyes
  of the JWST has already revealed a great deal about these early luminous 
 sources. Large surveys of the ultraviolet luminosity function (UVLFs) at z
  > 10 show that there are many more massive\, bright galaxies\, beyond tho
 se predicted by our simple assumptions of star-formation. Furthermore\, ob
 servations also reveal a surprisingly early formation of supermassive blac
 k holes and Active Galactic Nuclei\, providing an intriguing prospect for 
 novel theories. By combining the latest limits on the 21-cm power spectrum
  and global signal with recent JWST observations\, we provide the first sy
 nergetic constraints on star-formation efficiency of the early Universe. W
 e also open up the possibility of investigating the role of stellar variab
 ility and impact of Population III stars in the early Universe.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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