Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
Will J. Percival, Beth A. Reid, Daniel J. Eisenstein, Neta A. Bahcall, Tamas Budavari, Joshua A. Frieman, Masataka Fukugita, James E. Gunn, Zeljko Ivezic, Gilli… 展开作者
Will J. Percival, Beth A. Reid, Daniel J. Eisenstein, Neta A. Bahcall, Tamas Budavari, Joshua A. Frieman, Masataka Fukugita, James E. Gunn, Zeljko Ivezic, Gillian R. Knapp, Richard G. Kron, Jon Loveday, Robert H. Lupton, Timothy A. McKay, Avery Meiksin, Robert C. Nichol, Adrian C. Pope, David J. Schlegel, Donald P. Schneider, David N. Spergel, Chris Stoughton, Michael A. Strauss, Alexander S. Szalay, Max Tegmark, Michael S. Vogeley, David H. Weinberg, Donald G. York, Idit Zehavi
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22 pages, 16 figures, minor changes to match version published in MNRAS
光谱斯隆数字巡天(SDSS)数据发布7(DR 7)星系样本代表了使用原始SDSS目标选择标准观察到的最终星系集。我们分析了这个样本中的星系团,包括亮红星系(LRG)和主样本,还包括2度场星系红移巡天(2dFGRS)数据。在红移不同切片的功率谱中观察到了重子声学振荡,这使我们能够在多个历元上约束距离-红移关系。在红移z=0.275处,我们得到了r_s(z_d)/D_V(0.275)=0.1390+/-0.0037(2.7%精度),其中r_s(z_d)是重子拖曳时的同动声视界,D_V(z)=[(1+z)^2D_A^2cz/H(z)]^(1/3),D_A(z)是角直径距离,H(z)是哈勃参数。我们发现一个几乎独立的距离比D_V(0.35)/D_V(0.2)=1.736+/-0.065的约束条件,这与将我们的z=0.275距离约束条件与WMAP 5年数据相结合得到的最佳拟合Lambda CDM模型在1.1 σ水平上是一致的。该偏移量与先前对SDSS DR 5样本进行的分析中发现的偏移量相似,但现在差异的显著性较低,这是由于修订了误差分析和所采用方法的变化以及增加了更多数据而引起的变化。使用WMAP 5对Omega_bh^2和Omega_ch^2的约束,并结合我们的BAO距离测量结果和来自联合超新星样本的测量结果,对Omega_m=0.286+/-0.018和H_0 = 68.2+/-2.2km/s/Mpc进行了严格的约束,这对于曲率和非λ暗能量是鲁棒的。这一结果与红移大于BAO和超新星测量所探测的红移的暗能量的行为无关。(节略)
英文摘要:
The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample represents the final set of galaxies observed using the original SDSS target selection criteria. We analyse the clustering of galaxies within this sample, including both the Luminous Red Galaxy (LRG) and Main samples, and also include the 2-degree Field Galaxy Redshift Survey (2dFGRS) data. Baryon Acoustic Oscillations are observed in power spectra measured for different slices in redshift; this allows us to constrain the distance--redshift relation at multiple epochs. We achieve a distance measure at redshift z=0.275, of r_s(z_d)/D_V(0.275)=0.1390+/-0.0037 (2.7% accuracy), where r_s(z_d) is the comoving sound horizon at the baryon drag epoch, D_V(z)=[(1+z)^2D_A^2cz/H(z)]^(1/3), D_A(z) is the angular diameter distance and H(z) is the Hubble parameter. We find an almost independent constraint on the ratio of distances D_V(0.35)/D_V(0.2)=1.736+/-0.065, which is consistent at the 1.1sigma level with the best fit Lambda-CDM model obtained when combining our z=0.275 distance constraint with the WMAP 5-year data. The offset is similar to that found in previous analyses of the SDSS DR5 sample, but the discrepancy is now of lower significance, a change caused by a revised error analysis and a change in the methodology adopted, as well as the addition of more data. Using WMAP5 constraints on Omega_bh^2 and Omega_ch^2, and combining our BAO distance measurements with those from the Union Supernova sample, places a tight constraint on Omega_m=0.286+/-0.018 and H_0 = 68.2+/-2.2km/s/Mpc that is robust to allowing curvature and non-Lambda dark energy. This result is independent of the behaviour of dark energy at redshifts greater than those probed by the BAO and supernova measurements. (abridged)
The Size, Shape and Orientation of Cosmological Voids in the Sloan Digital Sky Survey
我们提出了一个详细的描述,我们的空洞发现算法,这是一个由Hoyle和Vogeley(2002)的处方的扩展。我们包括一个讨论的算法的再现性和鲁棒性,以及检测到的空隙的统计意义。我们将我们的空洞发现者应用于斯隆数字巡天(SDSS)的数据发布5(DR5),并确定了232个宇宙学空洞。将创建包含检测到的空隙的最显著属性的空隙目录。我们提出了一个我们确定的宇宙学空洞的大小,形状和方向的分布的统计分析。我们还研究了红移为0.04 < z < 0.16的可能趋势。我们比较我们的结果,从一个相同的分析模拟目录的基础上的LambdaCDM模型,并找到合理的协议。然而,宇宙学空洞的总体方向存在一些统计学上的显著差异,需要通过进一步改进模拟来加以调和。
Four New Observational $H(z)$ Data From Luminous Red Galaxies of Sloan Digital Sky Survey Data Release Seven
采用微分年龄法,利用Sloan数字巡天数据7(SDSS DR 7)中包含红移$0<z<0.4$的17832个亮红星系(LRGs)测量哈勃参数。利用全谱拟合软件UlySS,用单星族(SSP)模型对这些光谱进行了约简,并得到了我们所选样本的最佳年龄信息。随着年龄-红移关系的减小,获得了4个新的观测$H(z)$数据点,它们分别是$H(z)=69.0\pm19.6$ km s $^{-1}$ Mpc $^{-1}$ at $z=0.07$,$H(z)=68.6\pm26.2$ km s $^{-1}$ Mpc $^{-1}$ at $z=0.12$,$H(z)$ = $72.9\pm29.6$ km s $^{-1}$ Mpc $^{-1}$ at $z=0.2$和$H(z)$ = $88.8\pm36.6$ km s $^{-1}$ Mpc $^{-1}$ at $z=0.28$.结合其他21个OHD数据点,给出了平面和非平面$Λ$ CDM模型的约束性能。
The Pittsburgh Sloan Digital Sky Survey MgII Quasar Absorption-Line Survey Catalog
我们提出了一个红移区间为0.36 <= z <= 2.28的镁II类星体吸收线系统的目录。该星表由斯隆数字巡天数据发布4(SDSS DR 4)类星体光谱构建。目前,该目录包含> 17,000个测量的MgII双峰。我们还提供了用于构建目录的~ 44,600个类星体光谱的数据,包括红移和星等信息,连续归一化光谱,以及在我们的置信阈值下可检测到的红移相关最小静止等效宽度的相应阵列。该目录可在网上查阅。仔细的第二次搜索的500个随机光谱表明,每100个光谱搜索,大约一个显着的MgII系统被意外拒绝。目前的计划,扩大目录以外的DR 4类星体进行了讨论。已知许多MgII吸收体与星系有关。因此,结合大尺寸和充分理解的统计数据,使这个目录的理想精密研究的低电离和中性气体区域与星系在低到中等红移。使用该目录的MgII吸收剂的统计分析将在随后的论文中提出。
Direct Minkowski Functional analysis of large redshift surveys: a new high--speed code tested on the luminous red galaxy Sloan Digital Sky Survey-DR7 catalogue
Colour Gradients and the Colour-Magnitude Relation: Different Properties of Brightest Cluster Galaxies and E/S0 Galaxies in the Sloan Digital Sky Survey
Observational Upper Bound on the Cosmic Abundances of Negative-mass Compact Objects and Ellis Wormholes from the Sloan Digital Sky Survey Quasar Lens Search