论文标题
GPC量表上大型类似类的轴的相关方向
Correlated orientations of the axes of large quasar groups on Gpc scales
论文作者
论文摘要
已在GPC量表上报道了类星体光学和无线电极化以及无线电喷气机的相关方向，这可能是由于自旋轴的固有比对引起的。光学类星体极化似乎优先与主体大规模结构（特别是大型类星体组（LQG））对齐或正交。使用RedShifts的71个LQG的样品$ 1.0 \ LEQ Z \ LEQ 1.8 $，我们研究LQG自己是否表现出相关的方向。我们发现，LQG位置角度（PAS）不太可能从统一分布中得出（$ p $ - 值$ 0.008 \ Lessim P \ Lessim 0.07 $）。 LQG PA分布是双峰的，中位模式为$ \barθ\ sim45 \ pm2^{\ circ}，136 \ pm2^{\ circ} $，非常接近Quasar无线电极化的平均角度，在两个区域中报道了与我们的LQG样品相吻合。我们量化了PA数据中的对齐程度，并发现LQG在非常大的尺度上是对齐和正交的。最大意义是$ \ simeq 0.8 \％$（$2.4σ$），在$ \ sim 30^{\ circ} $（1.6 gpc）的典型角（适当）分离处。如果LQG方向相关性是真实的，则代表比宇宙学模拟预测的尺度上的大规模结构对齐，并且至少比迄今为止观察到的任何数量级要大，除了Quasar偏振 /放射射流码头外。我们得出的结论是，LQG对齐有助于解释类星体化 /放射喷射的对准，但提出了有关LQG相关性起源和一致性宇宙学模型的假设的挑战性问题。
Correlated orientations of quasar optical and radio polarisation, and of radio jets, have been reported on Gpc scales, possibly arising from intrinsic alignment of spin axes. Optical quasar polarisation appears to be preferentially either aligned or orthogonal to the host large-scale structure, specifically large quasar groups (LQGs). Using a sample of 71 LQGs at redshifts $1.0 \leq z \leq 1.8$, we investigate whether LQGs themselves exhibit correlated orientation. We find that LQG position angles (PAs) are unlikely to be drawn from a uniform distribution ($p$-values $0.008 \lesssim p \lesssim 0.07$). The LQG PA distribution is bimodal, with median modes at $\barθ\sim45\pm2^{\circ}, 136\pm2^{\circ}$, remarkably close to the mean angles of quasar radio polarisation reported in two regions coincident with our LQG sample. We quantify the degree of alignment in the PA data, and find that LQGs are aligned and orthogonal across very large scales. The maximum significance is $\simeq 0.8\%$ ($2.4σ$) at typical angular (proper) separations of $\sim 30^{\circ}$ (1.6 Gpc). If the LQG orientation correlation is real, it represents large-scale structure alignment over scales larger than those predicted by cosmological simulations and at least an order of magnitude larger than any so far observed, with the exception of quasar-polarisation / radio-jet alignment. We conclude that LQG alignment helps explain quasar-polarisation / radio-jet alignment, but raises challenging questions about the origin of the LQG correlation and the assumptions of the concordance cosmological model.
