Application of the iterative reconstruction to simulated galaxy fields
Application of the iterative reconstruction to simulated galaxy fields
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DOI：
10.1093/mnras/sty3137
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发表时间：
2018-10
影响因子：
4.8
通讯作者：
Ryuichiro Hada;D. Eisenstein
中科院分区：
文献类型：
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作者：
Ryuichiro Hada;D. Eisenstein
我们应用迭代重建方法获得的红移空间星系模拟从$N$体模拟。通过对两点相关函数的比较，我们发现，尽管与物质场相比，迭代方法的性能受到散粒噪声和星系偏差的限制，但无论是在真实的还是在红移空间，迭代方法都能更好地从星系场重建初始线性密度场.此外，与标准方法不同，迭代方法能够更精确地重建双极和四极。我们看到，随着星系的数量密度变小，重建的性能变差，由于稀疏。然而，在确定的偏差（$\sim20\%$）的精度几乎没有影响的重建过程。
We apply an iterative reconstruction method to galaxy mocks in redshift space obtained from $N$-body simulations. Comparing the two-point correlation functions for the reconstructed density field, we find that although the performance is limited by shot noise and galaxy bias compared to the matter field, the iterative method can still reconstruct the initial linear density field from the galaxy field better than the standard method both in real and in redshift space. Furthermore, the iterative method is able to reconstruct both the monopole and quadrupole more precisely, unlike the standard method. We see that as the number density of galaxies gets smaller, the performance of reconstruction gets worse due to the sparseness. However, the precision in the determination of bias ($\sim20\%$) hardly impacts on the reconstruction processes.