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首页> 外文期刊>The Astrophysical journal >THE ANGULAR POWER SPECTRUM OF GALAXIES FROM EARLY SLOAN DIGITAL SKY SURVEY DATA
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THE ANGULAR POWER SPECTRUM OF GALAXIES FROM EARLY SLOAN DIGITAL SKY SURVEY DATA

机译：来自早期斯隆数字天空调查数据的星系角功率谱

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摘要

We compute the angular power spectrum C_l from 1.5 million galaxies in early Sloan Digital Sky Survey (SDSS) data on large angular scales, l approx< 600. The data set covers about 160 deg~2, with a characteristic depth on the order of 1 h~(-1) Gpc in the faintest (21 < r~* < 22) of our four magnitude bins. Cosmological interpretations of these results are presented in a companion paper by Dodelson and coworkers. The data in all four magnitude bins are consistent with a simple flat "concordance" model with nonlinear evolution and linear bias factors on the order of unity. Nonlinear evolution is particularly evident for the brightest galaxies. A series of tests suggests that systematic errors related to seeing, reddening, etc. are negligible, which bodes well for the 60-fold larger sample that the SDSS is currently collecting. Uncorrelated error bars and well-behaved window functions make our measurements a convenient starting point for cosmological model fitting.
机译：我们从早期斯隆数字天空测量（SDSS）数据中的150万个星系，以大角度尺度（l大约<600）计算出角功率谱C_1。数据集覆盖约160 deg〜2，特征深度约为1在四个量级区间的最微弱（21

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