星系团类属简并度的半解析研究
Semi-analytical Study on the Generic Degeneracy for Galaxy Clustering Measurements
摘要:
从红移空间的星系功率谱,我们得到星系团测量的一般简并度的半解析结果。定义观测量$\bar{A}= Gbσ_8$和$\bar{R} = Gfσ_8$($G$是增长函数,$b$是偏差,$f$是增长率,$σ_8$是功率谱的幅度),我们执行Fisher矩阵形式主义来预测这些量的预期精度,用于类似于欧几里得的调查。在这些结果中,我们发现星系巡天观测在$\bar{A}$和$\bar{R}$之间一般有轻微的负相关,并且它们总是可以测量$\bar{R}$,大约是$\bar{A}$的3.7到4.7倍。
英文摘要:
From the galaxy power spectrum in redshift space, we derive semi-analytical results on the generic degeneracy of galaxy clustering measurements. Defining the observables $\bar{A}= Gbσ_8$ and $\bar{R} = Gfσ_8$, (being $G$ the growth function, $b$ the bias, $f$ the growth rate, and $σ_8$ the amplitude of the power spectrum), we perform a Fisher matrix formalism to forecast the expected precision of these quantities for a Euclid-like survey. Among the results we found that galaxy surveys have generically a slightly negative correlation between $\bar{A}$ and $\bar{R}$, and they can always measure $\bar{R}$ about 3.7 to 4.7 times better than $\bar{A}$.
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