Mitigating the impact of fiber assignment on clustering measurements from deep galaxy redshift surveys
Mitigating the impact of fiber assignment on clustering measurements from deep galaxy redshift surveys
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DOI：
10.1088/1475-7516/2020/06/057
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发表时间：
2019-12
影响因子：
6.4
通讯作者：
Tomomi Sunayama;M. Takada;M. Reinecke;R. Makiya;T. Nishimichi;E. Komatsu;S. Saito;N. Tamura;
中科院分区：
文献类型：
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作者：
Tomomi Sunayama;M. Takada;M. Reinecke;R. Makiya;T. Nishimichi;E. Komatsu;S. Saito;N. Tamura;
我们研究了光纤分配对来自光纤馈送的光谱星系测量的星团测量的影响。我们发现了以前相对较浅的星系调查中没有的新效应，例如重子振荡光谱调查(BOSS)。具体地说，我们考虑覆盖宽红移范围的深度调查，如0.6≤z≤2.4，就像斯巴鲁主聚焦光谱仪(PFS)调查一样。这样的探测将拥有比我们所能放置的纤维更多的目标星系。这导致了两种影响。首先，它消除了波长比视场大小更长的波动，因为每个视场中观察到的星系数量几乎固定于可用光纤的数量。我们发现，我们可以通过根据目标星系的数量对每个场中的星系进行加权来恢复长波长涨落。第二，优先选择密度较低区域的星系。我们通过使用所谓的“个体逆概率”对星系进行加权来缓解这种影响。校正了这两个影响，我们恢复了基本的相关函数，在大于10h−1MPC的尺度上，精度优于1%。
We examine the impact of fiber assignment on clustering measurements from fiber-fed spectroscopic galaxy surveys. We identify new effects which were absent in previous, relatively shallow galaxy surveys such as Baryon Oscillation Spectroscopic Survey (BOSS). Specifically, we consider deep surveys covering a wide redshift range such as 0.6≤ z≤ 2.4, as in the Subaru Prime Focus Spectrograph (PFS) survey. Such surveys will have more target galaxies than we can place fibers on. This leads to two effects. First, it eliminates fluctuations with wavelengths longer than the size of the field of view, as the number of observed galaxies per field is nearly fixed to the number of available fibers. We find that we can recover the long-wavelength fluctuation by weighting galaxies in each field by the number of target galaxies. Second, it makes the preferential selection of galaxies in under-dense regions. We mitigate this effect by weighting galaxies using the so-called “individual inverse probability”. Correcting these two effects, we recover the underlying correlation function at better than 1% accuracy on scales greater than 10 h−1 Mpc.