MAPPING THE REAL-SPACE DISTRIBUTIONS OF GALAXIES IN SDSS DR7. I. TWO-POINT CORRELATION FUNCTIONS

MAPPING THE REAL-SPACE DISTRIBUTIONS OF GALAXIES IN SDSS DR7. I. TWO-POINT CORRELATION FUNCTIONS
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绘制 sdss dr7 中星系的真实空间分布图。

DOI:
10.3847/1538-4357/833/2/241
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发表时间:
2016-08
影响因子:
4.9
通讯作者:
Yang Lei
Yang Lei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shi Feng;Yang Xiaohu;Wang Huiyuan;Zhang Youcai;Mo H. J.;Van den Bosch Frank C.;Li Shijie;Liu Chengze;Liu Yi;Tweed Dylan;Yang Lei

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利用一种修正星系红移空间畸变的方法,绘制了Sloan数字巡天(SDSS)数据发布7(DR 7)中星系的实空间分布图。我们使用一个模拟目录的合奏,以证明我们的方法的可靠性。在这里,在一系列的第一篇论文中,我们主要集中在两点相关函数(2 PCF)的星系。总的来说,在重建的真实的空间中测量的2 PCF比直接测量更亮,如果重建使用正确的宇宙学,则其精度优于由于宇宙方差引起的测量误差。将该方法应用于SDSS DR 7,我们构建了一个真实空间版本的主星系表,其中包含396,068个位于北银河帽的星系,其红移范围为0.01 ≤ z ≤ 0.12。斯隆长城是附近宇宙中已知的最大结构,它并不像在红移空间中那样是一个占主导地位的过密结构。我们在重建的真实的空间中测量了不同亮度和颜色的星系的2 PCF。所有这些都显示出明显的偏离单一的幂律形式,并揭示了明确的过渡,从一个晕到两个晕的条款。与红移空间中相应的2 PCF的比较很好地展示了RSD如何在大尺度上提高聚类能力(在尺度上约为40%-50%),并在小尺度上抑制它(在尺度上约为70%-80%)。
Using a method to correct redshift-space distortion (RSD) for individual galaxies, we mapped the real-space distributions of galaxies in the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). We use an ensemble of mock catalogs to demonstrate the reliability of our method. Here, in the first paper in a series, we focus mainly on the two-point correlation function (2PCF) of galaxies. Overall the 2PCF measured in the reconstructed real space for galaxies brighter than agrees with the direct measurement to an accuracy better than the measurement error due to cosmic variance, if the reconstruction uses the correct cosmology. Applying the method to the SDSS DR7, we construct a real-space version of the main galaxy catalog, which contains 396,068 galaxies in the North Galactic Cap with redshifts in the range 0.01 ≤ z ≤ 0.12. The Sloan Great Wall, the largest known structure in the nearby universe, is not as dominant an overdense structure as it appears to be in redshift space. We measure the 2PCFs in reconstructed real space for galaxies of different luminosities and colors. All of them show clear deviations from single power-law forms, and reveal clear transitions from one-halo to two-halo terms. A comparison with the corresponding 2PCFs in redshift space nicely demonstrates how RSDs boost the clustering power on large scales (by about 40%–50% at scales ) and suppress it on small scales (by about 70%–80% on a scale of ).
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