A unified fitting of HI and HeII Ly alpha transmitted flux of QSO HE 2347-4342 with Lambda CDM hydrodynamic simulations
文献类型：期刊论文
| 作者 | Liu, Jiren ; Jamkhedkar, Priya; Zheng, Wei; Feng, Long-Long; Fang, Li-Zhi
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2006-07-10 |
| 卷号 | 645期号:2页码:861-867 |
| 关键词 | cosmology : theory large-scale structure of universe |
| 英文摘要 | Using cosmological hydrodynamic simulations of the boolean AND CDM model, we present a comparison between the simulation sample and real data sample of H (I) and He (II) Ly alpha transmitted flux in the absorption spectra of the QSO HE 2347-4342. The boolean AND CDM model is successful in simultaneously explaining the statistical features of both H (I) and He (II) Ly alpha transmitted flux. It includes the following features: (1) The power spectra of the transmitted flux of H (I) and He (II) can be well fitted on all scales >= 0.28 h(-1) Mpc for H and >= 1.1 h(-1) Mpc for He. (2) The Doppler parameters of absorption features of He (II) and H (I) are found to be turbulent broadening. (3) The ratio of He (II) to H (I) optical depths are substantially scattered, due to the significant effect of noise. A large part of the eta scatter is due to the noise in the He (II) flux. However, the real data contain more low-eta events than the simulation sample. This discrepancy may indicate that the mechanism leading extra fluctuations on the simulation data, such as a fluctuating UV radiation background, is needed. Yet models of these extra fluctuations should satisfy the following constraints: (1) If the fluctuations are Gaussian, they should be limited by the power spectra of observed H (I) and He (II) flux. (2) If the fluctuations are non-Gaussian, they should be limited by the observed non-Gaussian features of the H (I) and He (II) flux. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000239053900010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7045]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China 2.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA 3.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 4.Purple Mt Observ, Nanjing 210008, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Jiren,Jamkhedkar, Priya,Zheng, Wei,et al. A unified fitting of HI and HeII Ly alpha transmitted flux of QSO HE 2347-4342 with Lambda CDM hydrodynamic simulations[J]. ASTROPHYSICAL JOURNAL,2006,645(2):861-867. |
| APA | Liu, Jiren,Jamkhedkar, Priya,Zheng, Wei,Feng, Long-Long,&Fang, Li-Zhi.(2006).A unified fitting of HI and HeII Ly alpha transmitted flux of QSO HE 2347-4342 with Lambda CDM hydrodynamic simulations.ASTROPHYSICAL JOURNAL,645(2),861-867. |
| MLA | Liu, Jiren,et al."A unified fitting of HI and HeII Ly alpha transmitted flux of QSO HE 2347-4342 with Lambda CDM hydrodynamic simulations".ASTROPHYSICAL JOURNAL 645.2(2006):861-867. |
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来源：国家天文台
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