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SUMMARY:Latest upper limits on 21 cm power spectrum using MWA observations
  - Ridhima Nunhokee\, Curtin University (Remote)
DTSTART:20250403T090000Z
DTEND:20250403T100000Z
UID:TALK229174@talks.cam.ac.uk
CONTACT:Harry Bevins
DESCRIPTION:We present the deepest upper limits achieved by the Murchison 
 Widefield Array to date at redshifts z=6.5\, z=6.8\, and z=7. This study i
 s based on observations centred at (RA = 0h\, DEC = −27°)\, collected b
 etween 2013 and 2021. The analysis builds upon the systematic framework de
 veloped in Nunhokee et al. (2024)\, which employs intermediate data produc
 ts for data quality assessment to minimise contamination in the targeted p
 ower spectrum region. The final power spectra are constructed from 221 hou
 rs of observations for z=6.5 and 226 hours for z=6.8 and z=7.0\, using the
  Cosmological HI Power Spectrum Estimator. Our results provide the first e
 vidence of a heated intergalactic medium (IGM) at redshifts z=6.5 to z=7.0
 . Additionally\, I will discuss how these results can be improved by refin
 ing the separation of thermal noise and systematics from foregrounds\, lev
 eraging fluctuations in the probability distributions of the power spectra
  (Trott et al.\,submitted).
LOCATION:SPO room + online
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