Cosmic structure and dynamics of the local universe
Cosmic structure and dynamics of the local universe
复制标题
局部宇宙的宇宙结构和动力学
DOI:
10.1111/j.1745-3933.2012.01340.x
复制
发表时间:
2012
影响因子:
--
通讯作者:
Gottlöber
中科院分区:
文献类型:
--
作者:
Kitaura;Erdoǧdu;Khalatyan;Angulo;Hoffman;Gottlöber
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.
登录
查看更多内容
DOI:
10.1111/j.1365-2966.2009.16163.x
发表时间:
2009
影响因子:
4.8
作者:
F. Kitaura;J. Jasche;R. Metcalf
通讯作者:
R. Metcalf
DOI:
10.1086/592947
发表时间:
2008-09
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
A. Kashlinsky;F. Atrio-Barandela;D. Kocevski;H. Ebeling
通讯作者:
A. Kashlinsky;F. Atrio-Barandela;D. Kocevski;H. Ebeling
DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
V. Bistolas;Y. Hoffman
通讯作者:
Y. Hoffman
DOI:
10.1111/j.1365-2966.2012.21210.x
发表时间:
2012-02
影响因子:
4.8
作者:
E. Branchini;M. Davis;A. Nusser
通讯作者:
E. Branchini;M. Davis;A. Nusser
DOI:
10.1086/382125
发表时间:
2003-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Tegmark;M. Blanton;M. Strauss;F. Hoyle;D. Schlegel;R. Scoccimarro;M. Vogeley;D. Weinberg
通讯作者:
M. Tegmark;M. Blanton;M. Strauss;F. Hoyle;D. Schlegel;R. Scoccimarro;M. Vogeley;D. Weinberg