THE SLOAN DIGITAL SKY SURVEY QUASAR LENS SEARCH. VI. CONSTRAINTS ON DARK ENERGY AND THE EVOLUTION OF MASSIVE GALAXIES
THE SLOAN DIGITAL SKY SURVEY QUASAR LENS SEARCH. VI. CONSTRAINTS ON DARK ENERGY AND THE EVOLUTION OF MASSIVE GALAXIES
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DOI：
10.1088/0004-6256/143/5/120
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发表时间：
2012-03
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影响因子：
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通讯作者：
M. Oguri;N. Inada;M. Strauss;C. Kochanek;I. Kayo;M. Shin;T. Morokuma;G. Richards;C. Rusu
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作者：
M. Oguri;N. Inada;M. Strauss;C. Kochanek;I. Kayo;M. Shin;T. Morokuma;G. Richards;C. Rusu
我们提出了一个统计分析的最终透镜样本从斯隆数字巡天类星体透镜搜索（SQLS）。从50，836个源类星体中选出19个透镜类星体的完整子样本的数量分布与理论预期进行了比较，特别注意选择函数。假设星系的速度函数不随红移而演化，SQLS样本将宇宙学常数限制为ΩΛ = 0.79+0.06−0.07（stat.）+ 0.06−0.06（系统）宇宙是平坦的。当SQLS与来自重子声振荡（BAO）测量或来自威尔金森微波各向异性探测器（WMAP）的结果的约束相结合时，发现暗能量状态方程与w = −1是一致的。我们还获得了宇宙学参数和星系速度函数的红移演化的同时约束，没有发现任何约束的组合中的红移演化在z 1的证据。例如，数量密度演化被量化为νn <$dln <$*/dln（1 + z），速度弥散演化νσ <$dln σ*/dln（1 + z）被约束为νn = 1.06+1.36−1.39（stat.）+ 0.33 - 0.64（系统）和νσ = −0.05+0.19−0.16（统计）+ 0.03−0.03（系统），当SQLS结果与BAO和WMAP相结合时，对于具有宇宙学常数的平坦模型，分别是。我们发现，即使在星系演化参数完全边缘化之后，也会有大量的暗能量。因此，透镜类星体的统计数据有力地证实了宇宙的加速膨胀。
We present a statistical analysis of the final lens sample from the Sloan Digital Sky Survey Quasar Lens Search (SQLS). The number distribution of a complete subsample of 19 lensed quasars selected from 50,836 source quasars is compared with theoretical expectations, with particular attention given to the selection function. Assuming that the velocity function of galaxies does not evolve with redshift, the SQLS sample constrains the cosmological constant to ΩΛ = 0.79+0.06−0.07(stat.)+0.06−0.06(syst.) for a flat universe. The dark energy equation of state is found to be consistent with w = −1 when the SQLS is combined with constraints from baryon acoustic oscillation (BAO) measurements or results from the Wilkinson Microwave Anisotropy Probe (WMAP). We also obtain simultaneous constraints on cosmological parameters and redshift evolution of the galaxy velocity function, finding no evidence for redshift evolution at z ≲ 1 in any combinations of constraints. For instance, number density evolution quantified as νn ≡ dln ϕ*/dln (1 + z) and the velocity dispersion evolution νσ ≡ dln σ*/dln (1 + z) are constrained to νn = 1.06+1.36−1.39(stat.)+0.33−0.64(syst.) and νσ = −0.05+0.19−0.16(stat.)+0.03−0.03(syst.), respectively, when the SQLS result is combined with BAO and WMAP for flat models with a cosmological constant. We find that a significant amount of dark energy is preferred even after fully marginalizing over the galaxy evolution parameters. Thus, the statistics of lensed quasars robustly confirm the accelerated cosmic expansion.