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arXiv 1208.0331astro-ph.COastro-ph.GA
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互相关法测量z ~ 0.8处21 cm亮度起伏

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, Y. -C. Li, Y. -W. Liao, A. Natarajan, U. -L. Pen, J. B. Peter… 展开作者

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

摘要:

在这封信中,绿岸望远镜获得的21厘米强度图与WiggleZ暗能量巡天中星系追踪的大尺度结构交叉相关。数据跨越红移范围0.6 < z < 1,两个领域共计~41度。平方以及190小时的无线电集成时间。互相关约束Omega_HI b_HI r = [0.43 \pm 0.07(stat.)\pm 0.04(系统)] x 10^-3,其中Omega_HI是中性氢HI分数,r是星系-氢相关系数,b_HI是HI偏置参数。这是在具有挑战性的红移范围内对中性氢密度波动的最精确的约束。我们的测量提高了以前的21厘米互相关在z ~ 0.8无论是在其精度和范围内的尺度探测。

英文摘要:

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 ~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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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