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Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation

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arxiv 1208.0331 v3 pith:AOETWUCH submitted 2012-08-01 astro-ph.CO astro-ph.GA

Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation

K. W. Masui , E. R. Switzer , N. Banavar , K. Bandura , C. Blake , L.-M. Calin , T.-C. Chang , X. Chen
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Y.-C. Li Y.-W. Liao A. Natarajan U.-L. Pen J. B. Peterson J. R. Shaw T. C. Voytek
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keywords cross-correlationrangefluctuationshydrogenmeasurementneutralomegaredshift
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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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Cited by 4 Pith papers

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