Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 763, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2041-8205/763/1/L20
Keywords
galaxies: evolution; large-scale structure of universe; radio lines: galaxies
Categories
Funding
- NSERC Canada
- NSF Physics Frontier Center [PHY-0114422]
- NSF [AST-1009615]
- Ministry of Science and Technology Project 863 [2012AA121701]
- NSFC [11073024]
- Bruce and Astrid McWilliams Center for Cosmology
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009615] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1211777] Funding Source: National Science Foundation
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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 similar to 41 deg. sq. and 190 hr of radio integration time. The cross-correlation constrains Omega(H I)b(H I)r = [0.43 +/- 0.07(stat.) +/- 0.04(sys.)] x 10(-3), where Omega(H I) is the neutral hydrogen (H I) fraction, r is the galaxy-hydrogen correlation coefficient, and b(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 similar to 0.8 both in its precision and in the range of scales probed.
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