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arXiv 1711.04583astro-ph.CO
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从2MASS测光红移星表角功率谱中提取宇宙学信息

Extracting cosmological information from the angular power spectrum of the 2MASS Photometric Redshift catalogue

A. Balaguera-Antolínez, M. Bilicki, E. Branchini, A. Postiglione

摘要:

利用几乎全天空的2MASS测光红移星表(2MPZ),我们首次进行了局部宇宙($z<0.24$)星系角成团的层析分析。我们估计的角度自动和交叉功率谱的2MPZ星系在三个光度红移箱,并使用专门的模拟目录,以评估其错误。我们测量一个子集的宇宙学参数,固定在他们的普朗克值,即重子分数$f_{b}=0.14^{+0.09}_{-0.06}$,总物质密度参数$Ω_{\rm m}=0.30\pm 0.06$,和有效的线性偏差的2MPZ星系$b_{\rm eff}$,它从$1.1^{+0.3}_{-0.4}$在$\langle z \rangle=0.05$ $2.1^{+0.3}_{-0.5}$在$\langle z\rangle=0.2$,主要是因为数据集的通量有限的性质。在这里获得的结果为本地宇宙同意与相同的方法在更高的红移,并确认了下一代光度测量,如欧几里得或LSST的层析技术的重要性。

英文摘要:

Using the almost all-sky 2MASS Photometric Redshift catalogue (2MPZ) we perform for the first time a tomographic analysis of galaxy angular clustering in the local Universe ($z<0.24$). We estimate the angular auto- and cross-power spectra of 2MPZ galaxies in three photometric redshift bins, and use dedicated mock catalogues to assess their errors. We measure a subset of cosmological parameters, having fixed the others at their Planck values, namely the baryon fraction $f_{b}=0.14^{+0.09}_{-0.06}$, the total matter density parameter $Ω_{\rm m}=0.30\pm 0.06$, and the effective linear bias of 2MPZ galaxies $b_{\rm eff}$, which grows from $1.1^{+0.3}_{-0.4}$ at $\langle z \rangle=0.05$ up to $2.1^{+0.3}_{-0.5}$ at $\langle z\rangle=0.2$, largely because of the flux-limited nature of the dataset. The results obtained here for the local Universe agree with those derived with the same methodology at higher redshifts, and confirm the importance of the tomographic technique for next-generation photometric surveys such as Euclid or LSST.

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