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Large-Scale Structures in the Early Sloan Digital Sky Survey: Comparison of the North and South Galactic Strips

机译:斯隆早期数字天空调查中的大型结构:北银河带和南银河带的比较

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We compare the large-scale galaxy clustering between the north and south Sloan Digital Sky Survey (SDSS) early data release (EDR) and also with the clustering in the Automatic Plate Measuring Facility (APM) Galaxy Survey. The three samples are independent and cover an area of 150, 230, and 4300 deg2, respectively. We combine SDSS data in different ways to approach the APM selection. Given the good photometric calibration of the SDSS data and the very good match of its north and south number counts, we combine them in a single sample. The joint clustering is compared with equivalent subsamples in the APM. The final sampling errors are small enough to provide an independent test for some of the results in the APM. We find evidence for an inflection in the shape of the two-point function in the SDSS that is very similar to what is found in the APM. This feature has been interpreted as evidence for nonlinear gravitational growth. By studying higher-order correlations, we can also confirm good agreement with the hypothesis of Gaussian initial conditions (and small biasing) for the structure traced by the large-scale SDSS galaxy distribution.
机译:我们比较了南北斯隆数字天空测量(SDSS)早期数据发布(EDR)之间的大规模星系聚类,以及自动板块测量设施(APM)星系测量中的聚类。这三个样本是独立的,分别覆盖150、230和4300 deg2的面积。我们以不同的方式组合SDSS数据来进行APM选择。鉴于SDSS数据的光度校准良好,并且其南北数计数非常匹配,我们将它们合并为一个样本。将联合聚类与APM中的等效子样本进行比较。最终采样误差很小,足以为APM中的某些结果提供独立测试。我们发现有证据表明SDSS中的两点函数形状发生了变化,这与APM中的发现非常相似。该特征已被解释为非线性重力增长的证据。通过研究高阶相关性,我们还可以证实与大规模SDSS星系分布所跟踪的结构的高斯初始条件(和较小的偏差)假设的良好一致性。

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