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Masui, K W; Switzer, E R; Banavar, N; Bandura, K; Blake, C; L -M Calin; T -C Chang; Chen, X; Y -C Li; Y -W Liao; Natarajan, A; U -L Pen; Peterson, J B; Shaw, J R; Voytek, T C
arXiv.org, 01/2013Paper, Journal Article
In this letter, 21 cm intensity maps acquired at the Green Bank Telescope are cross-correlated with large-scale structure traced by galaxies in the WiggleZ Dark Energy Survey. The data span the redshift range 0.6 < z < 1 over two fields totaling ~41 deg. sq. and 190 hours of radio integration time. The cross-correlation constrains Omega_HI b_HI r = 0.43 \pm 0.07 (stat.) \pm 0.04(sys.) x 10^-3, where Omega_HI is the neutral hydrogen HI fraction, r is the galaxy-hydrogen correlation coefficient, and b_HI is the HI bias parameter. This is the most precise constraint on neutral hydrogen density fluctuations in a challenging redshift range. Our measurement improves the previous 21 cm cross-correlation at z ~ 0.8 both in its precision and in the range of scales probed.
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