Cosmic structure and dynamics of the local universe

Cosmic structure and dynamics of the local universe
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局部宇宙的宇宙结构和动力学

DOI:
10.1111/j.1745-3933.2012.01340.x
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发表时间:
2012
影响因子:
--
通讯作者:
Gottlöber
Gottlöber
中科院分区:
--
文献类型:
--
作者:
Kitaura;Erdoǧdu;Khalatyan;Angulo;Hoffman;Gottlöber

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我们基于最近发布的两微米全天空红移观测星表,对本星系进行了宇宙学分析。我们的方法是基于贝叶斯网络机器学习算法(Kigen-code)和二阶拉格朗日微扰理论(2LPT)给出的结构形成模型。从初始条件出发,我们得到了一个重构的密度和特殊速度场集合,它高精度地表征了局域宇宙结构,详细揭示了细丝和空洞等非线性结构。相干红移空间失真在2LPT内得到一致校正。从重建和星系场之间的交叉相关和恢复的密度场的方差的集合,我们发现我们的方法是非常精确的,直到k∼1hMpc−1,并且仍然给出大约3-4h−1Mpc的可靠结果。我们在∼80h−1Mpc(νlg=5 2 2±86 km S−1,llg=2 91°±16°,blg=34°±8°)内得到的局域群运动与从宇宙微波背景和直接观测到的特殊运动得到的测量结果很好地符合,并与Λ清洁发展机制的预测一致。
We present a cosmography analysis of the local Universe based on the recently released Two-Micron All-Sky Redshift Survey catalogue. Our method is based on a Bayesian Networks Machine Learning algorithm (the Kigen-code) which self-consistently samples the initial density fluctuations compatible with the observed galaxy distribution and a structure formation model given by second-order Lagrangian perturbation theory (2LPT). From the initial conditions we obtain an ensemble of reconstructed density and peculiar velocity fields which characterize the local cosmic structure with high accuracy unveiling non-linear structures like filaments and voids in detail. Coherent redshift-space distortions are consistently corrected within 2LPT. From the ensemble of cross-correlations between the reconstructions and the galaxy field and the variance of the recovered density fields, we find that our method is extremely accurate up tok∼1hMpc−1and still yields reliable results down to scales of about 3–4h−1Mpc. The motion of the Local Group we obtain within ∼80h−1Mpc (νLG= 522 ± 86 km s−1,lLG= 291° ± 16°,bLG= 34° ± 8°) is in good agreement with measurements derived from the cosmic microwave background and from direct observations of peculiar motions and is consistent with the predictions of ΛCDM.
使用泊松对数正态滤波器从星系分布中恢复非线性密度场
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DOI: 10.1086/382125
发表时间: 2003-10
期刊: The Astrophysical Journal
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