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SUMMARY:Constraints on IGM Neutral Fraction at z = 9.02-14.18 Using Ly-⍺
  Measurements
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261026T040629Z
UID:indico-contribution-6475@cern.ch
DESCRIPTION:Speakers: Qianli Lyu (University of Oxford)\nIn this work\, we
  focused on the conditions at the Cosmic Dawn\, before cosmic reionisation
 . We place new constraints on the fraction of the neutral hydrogen of the 
 intergalactic medium at z = 9.02-14.18\, after analysing Lyman-alpha emiss
 ion (including upper limits) from 94 galaxy sources. Of these sources\, th
 ere were 91 3σ upper limits and 3 detections. This analysis was done usin
 g JWST data for both PRISM and grating measurements\, and incorporated bot
 h spectrometric and photometric measurements. New spectra from sources suc
 h as JADES Goods-North are included\, while one anomalous detection from J
 ADES Goods-South was excluded since it exhibited an abnormally high equiva
 lent width (EW). We updated the IGM neutral fraction (x_HI) to be 0.889 (+
 0.073 / -0.084). Furthermore\, from our model\, we found a significant dis
 tinction between xHI when variable ionised bubble size was considered vers
 us a fixed bubble size.\n\nhttps://indico.particle.mephi.ru/event/626/cont
 ributions/6475/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6475/
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