An estimate of \Omega_m without priors
An estimate of \Omega_m without priors
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DOI：
10.1086/379221
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发表时间：
2003-05
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影响因子：
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通讯作者：
H. Feldman;R. Juszkiewicz;P. Ferreira;M. Davis;E. Gaztañaga;J. Fry;A. Jaffe;S. Chambers;L. Costa;M. Bernardi;R. Giovanelli;Martha P. Haynes Gary Wegner
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文献类型：
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作者：
H. Feldman;R. Juszkiewicz;P. Ferreira;M. Davis;E. Gaztañaga;J. Fry;A. Jaffe;S. Chambers;L. Costa;M. Bernardi;R. Giovanelli;Martha P. Haynes Gary Wegner
利用星系对的平均相对奇特速度测量值，我们估计了宇宙学密度参数$\Omega_m$和密度波动幅度$\sigma_8 $。我们的结果表明，我们的统计数据是平均成对速度以及$\Omega_m$参数的稳健且可重复的度量。我们得到$\Omega_m = 0.30^{+0.17}_{-0.07}$和$\sigma_8 = 1.13^{+0.22}_{-0.23}$。这些估计不依赖于先前的假设绝热的初始密度波动，电离历史，或其他宇宙学参数的值。
Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter $\Omega_m$ and the amplitude of density fluctuations $\sigma_8$. Our results suggest that our statistic is a robust and reproducible measure of the mean pairwise velocity and thereby the $\Omega_m$ parameter. We get $\Omega_m = 0.30^{+0.17}_{-0.07}$ and $\sigma_8 = 1.13^{+0.22}_{-0.23}$. These estimates do not depend on prior assumptions on the adiabaticity of the initial density fluctuations, the ionization history, or the values of other cosmological parameters.