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THE OH LINE CONTAMINATION OF 21 cm INTENSITY FLUCTUATION MEASUREMENTS FOR z=1-4
Gong, Yan1; Chen, Xuelei2,3; Silva, Marta4; Cooray, Asantha1; Santos, Mario G.4
2011-10-10
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号740期号:1
摘要The large-scale structure of the universe can be mapped with unresolved intensity fluctuations of the 21 cm line. The power spectrum of the intensity fluctuations has been proposed as a probe of the baryon acoustic oscillations at low to moderate redshifts with interferometric experiments now under consideration. We discuss the contamination to the low-redshift 21 cm intensity power spectrum generated by the 18 cm OH line since the intensity fluctuations of the OH line generated at a slightly higher redshift contribute to the intensity fluctuations observed in an experiment. We assume the OH megamaser luminosity is correlated with the star formation rate and use the simulation to estimate the OH signal and the spatial anisotropies. We also use a semi-analytic simulation to predict the 21 cm power spectrum. At z = 1-3, we find that the OH contamination could reach 0.1%-1% of the 21 cm rms fluctuations at the scale of the first peak of the baryon acoustic oscillation. When z > 3 the OH signal declines quickly, so that the contamination on the 21 cm becomes negligible at high redshifts.
关键词Cosmology: Theory Diffuse Radiation
DOI10.1088/2041-8205/740/1/L20
收录类别SCI
语种英语
WOS记录号WOS:000295210900020
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7842
专题星系宇宙学研究部
作者单位1.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92097 USA
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
4.Univ Tecn Lisboa, Inst Super Tecn, CENTRA, P-1049001 Lisbon, Portugal
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Gong, Yan,Chen, Xuelei,Silva, Marta,et al. THE OH LINE CONTAMINATION OF 21 cm INTENSITY FLUCTUATION MEASUREMENTS FOR z=1-4[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,740(1).
APA Gong, Yan,Chen, Xuelei,Silva, Marta,Cooray, Asantha,&Santos, Mario G..(2011).THE OH LINE CONTAMINATION OF 21 cm INTENSITY FLUCTUATION MEASUREMENTS FOR z=1-4.ASTROPHYSICAL JOURNAL LETTERS,740(1).
MLA Gong, Yan,et al."THE OH LINE CONTAMINATION OF 21 cm INTENSITY FLUCTUATION MEASUREMENTS FOR z=1-4".ASTROPHYSICAL JOURNAL LETTERS 740.1(2011).
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