Three-Point Correlation Functions of SDSS Galaxies in Redshift Space: Morphology, Color, and Luminosity Dependence
Three-Point Correlation Functions of SDSS Galaxies in Redshift Space: Morphology, Color, and Luminosity Dependence
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DOI：
10.1093/pasj/56.3.415
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发表时间：
2004-03
影响因子：
2.3
通讯作者：
I. Kayo;Y. Suto;R. Nichol;Jun Pan;I. Szapudi;A. Connolly;J. Gardner;B. Jain;G. Kulkarni;T. Matsubara;R. Sheth;A. Szalay;J. Brinkmann
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作者：
I. Kayo;Y. Suto;R. Nichol;Jun Pan;I. Szapudi;A. Connolly;J. Gardner;B. Jain;G. Kulkarni;T. Matsubara;R. Sheth;A. Szalay;J. Brinkmann
我们给出了斯隆数字巡天(SDSS)中星系红移空间三点关联函数的测量结果。我们首次分析了这一统计量对星系形态、颜色和光度的依赖关系。为了控制由于选择效应的系统学，我们使用了由星等限制的SDSS数据(14.5<；r<；17.5)构建的r波段、体积有限的星系样本，并进一步将样本分为两种形态类型(早期和晚期)或两种颜色群体(红色和蓝色)。SDSS星系的三点相关函数符合等级关系，红移空间的约化三点振幅几乎与尺度无关(Qz=0.5∼1.0)。此外，它们对形态、颜色和亮度的依赖在统计上并不显著。鉴于两点相关函数对形态、颜色和光度的强烈依赖性，这意味着星系偏向在弱非线性到非线性尺度上是复杂的。我们发现，与基础质量的简单确定性线性关系不能解释我们在这些尺度上的测量。
We present measurements of the redshift-space three-point correlation function of galaxies in the Sloan Digital Sky Survey (SDSS). For the first time, we analyze the dependence of this statistic on galaxy morphology, color, and luminosity. In order to control systematics due to selection effects, we used r-band, volume-limited samples of galaxies, constructed from magnitude-limited SDSS data (14.5 <r< 17.5), and further divided the samples into two morphological types (early and late) or two color populations (red and blue). The three-point correlation function of SDSS galaxies follows the hierarchical relation well, and the reduced three-point amplitudes in redshift-space are almost scale-independent (Qz =0 .5 ∼ 1.0). In addition, their dependence on the morphology, color, and luminosity is not statistically significant. Given the robust morphological, color, and luminosity dependences of the two-point correlation function, this implies that galaxy biasing is complex on weakly non-linear to non-linear scales. We show that a simple deterministic linear relation with the underlying mass could not explain our measurements on these scales.