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arXiv 1201.1909astro-ph.CO
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斯隆数字巡天III第8次光度计发光星系数据新的中微子质量边界

New Neutrino Mass Bounds from Sloan Digital Sky Survey III Data Release 8 Photometric Luminous Galaxies

Roland de Putter, Olga Mena, Elena Giusarma, Shirley Ho, Antonio Cuesta, Hee-Jong Seo, Ashley Ross, Martin White, Dmitry Bizyaev, Howard Brewington, David Kirkb… 展开作者

Roland de Putter, Olga Mena, Elena Giusarma, Shirley Ho, Antonio Cuesta, Hee-Jong Seo, Ashley Ross, Martin White, Dmitry Bizyaev, Howard Brewington, David Kirkby, Elena Malanushenko, Viktor Malanushenko, Daniel Oravetz, Kaike Pan, Will J. Percival, Nicholas P. Ross, Donald P. Schneider, Alaina Shelden, Audrey Simmons, Stephanie Snedden

摘要:

我们目前中微子质量边界使用900,000发光星系光度红移测量斯隆数字巡天III数据发布八(SDSS DR 8)。这些星系的光度红移在$z = 0.45$和$z = 0.65$之间,覆盖了10,000平方度,因此探测到的体积为3 $h^{-3}$ Gpc $^3$,从而能够严格限制以大质量中微子形式存在的暗物质的数量。将我们的星系样本(我们称之为“CMASS”)与WMAP 7年宇宙微波背景(CMB)数据和哈勃空间望远镜(HST)最近的哈勃参数测量结果相结合,得到了一个新的中微子质量和的界值$\sum m_ν< 0.26$ eV,置信水平(CL)为95%.这个约束是用保守的多极范围选择的$30 < \ell < 200$,以尽量减少非线性,并在每个四个红移箱的自由偏置参数。我们使用模拟目录研究了假设这种线性星系偏差模型的影响,并发现该模型会导致$Ω_{\rm DM} h^2$中的小($\sim 1-1.5 σ$)偏差。出于这个原因,我们也引用中微子边界的基础上保守的星系偏置模型包含额外的,散粒噪声样的自由参数。在这种保守的情况下,边界被显著削弱,例如WMAP+HST+CMASS的$\sum m_ν< 0.36$ eV(95%置信水平)($\ell_{\rm max}=200$)。我们还研究了依赖的中微子约束的多极范围($\ell_{\rm max}=150$与$\ell_{\rm max}=200$)和数据集的组合包括作为一个先验。超新星和/或重子声振荡数据的增加并没有显着改善中微子质量约束一旦HST之前被包括在内。[删节]

英文摘要:

We present neutrino mass bounds using 900,000 luminous galaxies with photometric redshifts measured from Sloan Digital Sky Survey III Data Release Eight (SDSS DR8). The galaxies have photometric redshifts between $z = 0.45$ and $z = 0.65$, and cover 10,000 square degrees and thus probe a volume of 3$h^{-3}$Gpc$^3$, enabling tight constraints to be derived on the amount of dark matter in the form of massive neutrinos. A new bound on the sum of neutrino masses $\sum m_ν< 0.26$ eV, at 95% confidence level (CL), is obtained after combining our sample of galaxies, which we call "CMASS", with WMAP 7 year Cosmic Microwave Background (CMB) data and the most recent measurement of the Hubble parameter from the Hubble Space Telescope (HST). This constraint is obtained with a conservative multipole range choice of $30 < \ell < 200$ in order to minimize non-linearities, and a free bias parameter in each of the four redshift bins. We study the impact of assuming this linear galaxy bias model using mock catalogs, and find that this model causes a small ($\sim 1-1.5 σ$) bias in $Ω_{\rm DM} h^2$. For this reason, we also quote neutrino bounds based on a conservative galaxy bias model containing additional, shot noise-like free parameters. In this conservative case, the bounds are significantly weakened, e.g. $\sum m_ν< 0.36$ eV (95% confidence level) for WMAP+HST+CMASS ($\ell_{\rm max}=200$). We also study the dependence of the neutrino bound on multipole range ($\ell_{\rm max}=150$ vs $\ell_{\rm max}=200$) and on which combination of data sets is included as a prior. The addition of supernova and/or Baryon Acoustic Oscillation data does not significantly improve the neutrino mass bound once the HST prior is included. [abridged]

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