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

被引：296

作者：

Masui, K. W. ^{[1
,2
]}

Switzer, E. R. ^{[1
,3
]}

Banavar, N. ^{[4
]}

Bandura, K. ^{[5
]}

Blake, C. ^{[6
]}

Calin, L. -M. ^{[1
]}

Chang, T. -C. ^{[7
]}

Chen, X. ^{[8
,9
]}

Li, Y. -C. ^{[8
]}

Liao, Y. -W. ^{[7
]}

Natarajan, A. ^{[10
]}

Pen, U. -L. ^{[1
]}

Peterson, J. B. ^{[10
]}

Shaw, J. R. ^{[1
]}

Voytek, T. C. ^{[10
]}

机构：

[1] Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[3] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[4] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[5] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[6] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[7] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan

[8] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[9] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[10] Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 763卷 / 01期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

galaxies: evolution; large-scale structure of universe; radio lines: galaxies; DARK ENERGY SURVEY; LY-ALPHA SYSTEMS; I MASS FUNCTION; COSMIC STRUCTURE; GALAXIES; EMISSION; HYDROGEN; GAS;

D O I：

10.1088/2041-8205/763/1/L20

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：5

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