ICTS:31376

Video URL

Upper Limits on the 21 cm power spectrum using MWA (Online)

Upper Limits on the 21 cm power spectrum using MWA (Online)

(2025). Upper Limits on the 21 cm power spectrum using MWA (Online). SciVideos. https://youtu.be/wAOjz78HgG8

Upper Limits on the 21 cm power spectrum using MWA (Online). SciVideos, Apr. 06, 2025, https://youtu.be/wAOjz78HgG8 

          @misc{ scivideos_ICTS:31376,
            doi = {},
            url = {https://youtu.be/wAOjz78HgG8},
            author = {},
            keywords = {},
            language = {en},
            title = {Upper Limits on the 21 cm power spectrum using MWA (Online)},
            publisher = {},
            year = {2025},
            month = {apr},
            note = {ICTS:31376 see, \url{https://scivideos.org/index.php/icts-tifr/31376}}
          }
Chuneeta Nunhokee
Talk numberICTS:31376
Source RepositoryICTS-TIFR
Collection

Abstract

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 is based on observations centred at (RA = 0h, DEC = −27°), collected between 2013 and 2021. The analysis builds upon the systematic framework developed in Nunhokee et al. (2024), which employs intermediate data products for data quality assessment to minimise contamination in the targeted power spectrum region. The final power spectra are constructed from 221 hours 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 evidence of a heated intergalactic medium (IGM) at redshifts z=6.5 to z=7.0.