Relativistic corrections and non-Gaussianity in radio continuum surveys
文献类型：期刊论文
| 作者 | Maartens, Roy1,2; Zhao, Gong-Bo2,3 ; Bacon, David2; Koyama, Kazuya2; Raccanelli, Alvise4,5
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 2013-02-01 |
| 期号 | 2 |
| 关键词 | galaxy clustering cluster counts non-gaussianity |
| 英文摘要 | Forthcoming radio continuum surveys will cover large volumes of the observable Universe and will reach to high redshifts, making them potentially powerful probes of dark energy, modi fied gravity and non-Gaussianity. We consider the continuum surveys with LO-FAR, WSRT and ASKAP, and examples of continuum surveys with the SKA. We extend recent work on these surveys by including redshift space distortions and lensing convergence in the radio source auto-correlation. In addition we compute the general relativistic (GR) corrections to the angular power spectrum. These GR corrections to the standard Newtonian analysis of the power spectrum become significant on scales near and beyond the Hubble scale at each redshift. We find that the GR corrections are at most percent-level in LOFAR, WODAN and EMU surveys, but they can produce O(10%) changes for high enough sensitivity SKA continuum surveys. The signal is however dominated by cosmic variance, and multiple-tracer techniques will be needed to overcome this problem. The GR corrections are suppressed in continuum surveys because of the integration over redshift - we expect that GR corrections will be enhanced for future SKA HI surveys in which the source redshifts will be known. We also provide predictions for the angular power spectra in the case where the primordial perturbations have local non-Gaussianity. We find that non-Gaussianity dominates over GR corrections, and rises above cosmic variance when f(NL) greater than or similar to 5 for SKA continuum surveys. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000315576400044 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5998]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa 2.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA 5.CALTECH, Pasadena, CA 91125 USA |
| 推荐引用方式 GB/T 7714 | Maartens, Roy,Zhao, Gong-Bo,Bacon, David,et al. Relativistic corrections and non-Gaussianity in radio continuum surveys[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2013(2). |
| APA | Maartens, Roy,Zhao, Gong-Bo,Bacon, David,Koyama, Kazuya,&Raccanelli, Alvise.(2013).Relativistic corrections and non-Gaussianity in radio continuum surveys.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2). |
| MLA | Maartens, Roy,et al."Relativistic corrections and non-Gaussianity in radio continuum surveys".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2013). |
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来源：国家天文台
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