### Abstract

We obtain constraints on the cosmological density parameters, Ω_{m} and Ω_{b}, by comparing the preliminary measurement of the quasi-stellar object (QSO) power spectrum from the Two-Degree Field (2dF) QSO Redshift (2QZ) survey with results from an analytic technique of power spectrum estimation, described herein. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low-density models with Ω_{m} = 0.1-0.4. We show that a finite baryon fraction Ω_{b}/Ω_{m} = 0.2, consistent with observations of the cosmic microwave background anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how large a survey would be required before a significant constraint on the density parameters could be obtained. We demonstrate that the constraint could be significantly improved if the survey was four times larger.

Original language | English |
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Pages (from-to) | 958-962 |

Number of pages | 5 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 334 |

Issue number | 4 |

DOIs | |

Publication status | Published - Aug 21 2002 |

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### All Science Journal Classification (ASJC) codes

- Astronomy and Astrophysics
- Space and Planetary Science

### Cite this

**Cosmological constraint from the 2dF QSO spatial power spectrum.** / Yamamoto, Kazuhiro.

Research output: Contribution to journal › Article

*Monthly Notices of the Royal Astronomical Society*, vol. 334, no. 4, pp. 958-962. https://doi.org/10.1046/j.1365-8711.2002.05575.x

}

TY - JOUR

T1 - Cosmological constraint from the 2dF QSO spatial power spectrum

AU - Yamamoto, Kazuhiro

PY - 2002/8/21

Y1 - 2002/8/21

N2 - We obtain constraints on the cosmological density parameters, Ωm and Ωb, by comparing the preliminary measurement of the quasi-stellar object (QSO) power spectrum from the Two-Degree Field (2dF) QSO Redshift (2QZ) survey with results from an analytic technique of power spectrum estimation, described herein. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low-density models with Ωm = 0.1-0.4. We show that a finite baryon fraction Ωb/Ωm = 0.2, consistent with observations of the cosmic microwave background anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how large a survey would be required before a significant constraint on the density parameters could be obtained. We demonstrate that the constraint could be significantly improved if the survey was four times larger.

AB - We obtain constraints on the cosmological density parameters, Ωm and Ωb, by comparing the preliminary measurement of the quasi-stellar object (QSO) power spectrum from the Two-Degree Field (2dF) QSO Redshift (2QZ) survey with results from an analytic technique of power spectrum estimation, described herein. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low-density models with Ωm = 0.1-0.4. We show that a finite baryon fraction Ωb/Ωm = 0.2, consistent with observations of the cosmic microwave background anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how large a survey would be required before a significant constraint on the density parameters could be obtained. We demonstrate that the constraint could be significantly improved if the survey was four times larger.

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U2 - 10.1046/j.1365-8711.2002.05575.x

DO - 10.1046/j.1365-8711.2002.05575.x

M3 - Article

VL - 334

SP - 958

EP - 962

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -