MEASUREMENT OF 21 cm BRIGHTNESS FLUCTUATIONS AT z ∼ 0.8 IN CROSS-CORRELATION

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 hr of radio integration tim...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2013-01, Vol.763 (1), p.1-5
Main Authors: Masui, K W, Switzer, E R, Banavar, N, Bandura, K, Blake, C, Calin, L-M, Chang, T-C, Chen, X, Li, Y-C, Liao, Y-W, Natarajan, A, Pen, U-L, Peterson, J B, Shaw, J R, Voytek, T C
Format: Article
Language:English
Subjects:
ACCURACY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BRIGHTNESS
CORRELATION FUNCTIONS
Dark energy
DENSITY
Fluctuation
FLUCTUATIONS
GALAXIES
HYDROGEN
NONLUMINOUS MATTER
RED SHIFT
TELESCOPES
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Summary: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 hr of radio integration time. The cross-correlation constrains [Omega] sub(H I)b sub(H I)r = [0.43 + or - 0.07(stat.) + or - 0.04(sys.)] x 10 super(?3), where [Omega] sub(H I) is the neutral hydrogen (H I) fraction, r is the galaxy-hydrogen correlation coefficient, and b sub(H I) is the H I 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.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/763/1/L20