论文标题
在高红移处的大量星系的动态暗能模型的限制
Constraints on Dynamical Dark Energy Models from the Abundance of Massive Galaxies at High Redshifts
论文作者
论文摘要
我们比较了高红移Z = 4-7在不同动力学暗能量（DDE）模型中预测的巨大系统的最大丰度与观察到的最巨大星系的丰度已经在这种红移时已经存在。目的是从现有探针互补的状态参数w的黑暗能量方程的演变中得出约束。我们根据局部值W_0和状态方程的外观衍生时间d_a来采用DDE演变的标准参数化。我们通过使用三种不同的独立探针在不同的DDE模型中对组合（W_0，W_A）的组合产生限制：（i）从Candels调查得出的Z = 6处观察到的巨大对象的恒星质量函数； （ii）估计的大量光环的体积密度来自于在z = 4时在亚毫米范围内检测到的巨大的星形星系的观察； （iii）观察到的最大系统最大系统（估计的气体质量超过3 10^11 m_sun）的稀有性位于Z = 7处，这是最近在南极望远镜（SPT）调查中检测到的一个远红外的露骨物体。最后，我们表明，从上面的三个探针中的结果组合不包括DDE参数空间w_a> -3/4-（W_0 + 3/2）的相当大的分数，目前允许（甚至通过现有探针）。
We compare the maximal abundance of massive systems predicted in different dynamical dark energy (DDE) models at high redshifts z = 4-7 with the measured abundance of the most massive galaxies observed to be already in place at such redshifts. The aim is to derive constraints for the evolution of the dark energy equation of state parameter w which are complementary to existing probes. We adopt the standard parametrization for the DDE evolution in terms of the local value w_0 and of the look-back time derivative w_a of the equation of state. We derive constraints on combinations (w_0, w_a) in the different DDE models by using three different, independent probes: (i) the observed stellar mass function of massive objects at z = 6 derived from the CANDELS survey; (ii) the estimated volume density of massive halos derived from the observation of massive, star-forming galaxies detected in the submillimeter range at z = 4; (iii) The rareness of he most massive system (estimated gas mass exceeding 3 10^11 M_sun) observed to be in place at z = 7, a far-infrared-luminous object recently detected in the South Pole Telescope (SPT) survey. Finally, we show that the combination of our results from the three above probes excludes a sizable fraction of the DDE parameter space w_a > -3/4 - (w_0 + 3/2) presently allowed (or even favored) by existing probes.
