2 QZ类星体和2SLAQ LRG的两点关联：从类星体燃料的观点
The Two-Point Correlation of 2QZ Quasars and 2SLAQ LRGs: From a Quasar Fueling Perspective
摘要：
来自2dF类星体巡天（2 QZ）和2dF/SDSS LRG & QSO（2SLAQ）的公开数据，以及它们巨大的光谱定位和识别源的库，为我们提供了更准确地研究它们的真实空间相关性的机会，希望能够识别触发类星体活动的物理过程。我们使用这两个公共数据库来测量类星体和发光红星系之间的投影互相关$ω_p$。我们发现投影的两点相关性具有拟合的聚类半径$r_0, = 5.3 \pm 0.6 $和斜率$γ=1.83 \pm 0.42 $，尺度为0.7-27 $h^{-1}$ Mpc。我们试图通过将LRG样本分为蓝色和红色星系2个种群来理解这种强相关性。我们测量每个总体的交叉相关性。我们发现，这些类星体有一个更强的相关振幅与蓝，最近在我们的样本中的恒星形成人口比红被动发展人口，这有一个相关性，是更嘈杂，似乎平坦的尺度$< 5h^{-1}$ Mpc。我们比较这一结果发表的工作层次模型。明亮的类星体与最近经历了恒星形成爆发的LRG之间的更强的相关性表明，产生这两种活动的物理机制是相关的，并且轻微的合并或潮汐效应可能是明亮类星体活动的重要触发因素，并且/或者明亮的类星体比暗淡的类星体偏差更小。
英文摘要：
Public data from the 2dF quasar survey (2QZ) and 2dF/SDSS LRG & QSO (2SLAQ), with their vast reservoirs of spectroscopically located and identified sources, afford us the chance to more accurately study their real space correlations in the hopes of identifying the physical processes that trigger quasar activity. We have used these two public databases to measure the projected cross correlation, $ω_p$, between quasars and luminous red galaxies. We find the projected two-point correlation to have a fitted clustering radius of $r_0, = 5.3 \pm 0.6 $ and a slope, $γ=1.83 \pm 0.42 $ on scales from 0.7-27$h^{-1}$Mpc. We attempt to understand this strong correlation by separating the LRG sample into 2 populations of blue and red galaxies. We measure at the cross correlation with each population. We find that these quasars have a stronger correlation amplitude with the bluer, more recently starforming population in our sample than the redder passively evolving population, which has a correlation that is much more noisy and seems to flatten on scales $< 5h^{-1}$Mpc. We compare this result to published work on hierarchical models. The stronger correlation of bright quasars with LRGs that have undergone a recent burst of starformation suggests that the physical mechanisms that produce both activities are related and that minor mergers or tidal effects may be important triggers of bright quasar activity and/or that bright quasars are less highly biased than faint quasars.
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