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arXiv 1303.4302astro-ph.CO
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SDSS-III重子振荡谱学巡天:对综合Sachs Wolfe效应的限制

The SDSS-III Baryonic Oscillation Spectroscopic Survey: Constraints on the Integrated Sachs Wolfe effect

Carlos Hernandez-Monteagudo, Ashley Ross, Antonio Cuesta, Ricardo Genova-Santos, Jun-Qing Xia, Francisco Prada, Graziano Rossi, Mark Neyrinck, Matteo Viel, Jose… 展开作者

Carlos Hernandez-Monteagudo, Ashley Ross, Antonio Cuesta, Ricardo Genova-Santos, Jun-Qing Xia, Francisco Prada, Graziano Rossi, Mark Neyrinck, Matteo Viel, Jose-Alberto Rubino-Martin, Claudia G. Scoccola, Gongbo Zhao, Donald P. Schneider, Joel R. Brownstein, Daniel Thomas, Jonathan V. Brinkmann

摘要:

在综合萨克斯沃尔夫效应(ISW)的研究背景下,我们构建了一个模板的投影密度分布高达$z\simeq 0.7$通过使用发光星系(LGs)从斯隆数字巡天DR 8。我们在SDSS DR 8成像区域使用来自BOSS的超过10万个星系训练的photo-z目录。我们考虑两个不同的LG样本,其选择与SDSS-III/BOSS的选择相匹配:LOWZ样本($z\in [0.15,0.5]$)和CMASS样本($z\in[0.4,0.7]$)。在构建LG密度图时,我们使用来自恒星密度、勘测足迹、视宁度条件、天空辐射、尘埃消光和气团的信息来探索这些人工制品对两个LG样本的影响。与以前的研究一致,我们发现,CMASS样本是特别敏感的银河系恒星,占主导地位的贡献低于$\ell=7$的自动角功率谱。其他潜在的系统性影响主要是低多极范围($\ell\in[2,7]$),但留下波动较小的规模几乎不变。LOWZ、CMASS和LOWZ+CMASS样品在多极范围$\ell\in[2,100]$中得到的功率谱分别与线性$Λ$ CDM预期值和$b=1.98 \pm 0.11$、$2.08\pm0.14$和$1.88\pm 0.11$的恒定偏倚值兼容,无非高斯性痕迹:$\ell\in[4,100]$范围内完整LOWZ+CMASS样品在95%置信水平下的$f_{\rm NL}^{\rm local}=59\pm 75$。WMAP-9年资料与LOWZ+CMASS LG密度场互相关后,在1.62- 1.69PDMATHABMY水平上探测到ISW信号。虽然这一结果与一致性$Λ$ CDM模型中蒙特卡洛模拟的预测非常一致,但它本身不能排除爱因斯坦-德西特情景,并且与以前对该LG样本子集进行的研究相比,信号较低。

英文摘要:

In the context of the study of the Integrated Sachs Wolfe effect (ISW), we construct a template of the projected density distribution up to $z\simeq 0.7$ by using the Luminous Galaxies (LGs) from the Sloan Digital Sky Survey DR8. We use a photo-z catalogue trained with more than a hundred thousand galaxies from BOSS in the SDSS DR8 imaging area. We consider two different LG samples whose selection matches that of SDSS-III/BOSS: the LOWZ sample ($z\in [0.15,0.5]$) and the CMASS sample ($z\in[0.4,0.7]$). When building the LG density maps we use the information from star density, survey footprint, seeing conditions, sky emission, dust extinction and airmass to explore the impact of these artifacts on the two LG samples. In agreement with previous studies, we find that the CMASS sample is particularly sensitive to Galactic stars, which dominate the contribution to the auto-angular power spectrum below $\ell=7$. Other potential systematics affect mostly the low multipole range ($\ell\in[2,7]$), but leave fluctuations on smaller scales practically unchanged. The resulting power spectra in the multipole range $\ell\in[2,100]$ for the LOWZ, CMASS and LOWZ+CMASS samples are compatible with linear $Λ$CDM expectations and constant bias values of $b=1.98 \pm 0.11$, $2.08\pm0.14$ and $1.88\pm 0.11$, respectively, with no traces of non-Gaussianity: $f_{\rm NL}^{\rm local}=59\pm 75$ at 95% confidence level for the full LOWZ+CMASS sample in the range $\ell\in[4,100]$. After cross-correlating WMAP-9yr data with the LOWZ+CMASS LG density field, the ISW signal is detected at the level of 1.62--1.69$\,σ$. While this result is in close agreement with predictions from Monte Carlo simulations in the concordance $Λ$CDM model, it cannot rule out by itself an Einstein-de Sitter scenario, and has a moderately low signal compared to previous studies conducted on subsets of this LG sample.

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