47例甲状腺肿扩散测定
A Measurement of Diffusion in 47 Tucanae
摘要：
利用哈勃空间望远镜3号宽视场相机拍摄的图像，我们测量了通过球状星团47 Tuccenda核心的恒星扩散速率，并使用了这些观测中发现的年轻白矮星样本。这是第一次直接测量由于重力弛豫引起的扩散。我们发现，扩散速率$κ\approx 10-13$弧秒$^2$ Myr $^{-1}$是一致的弛豫时间的理论估计在核心的47 Tuccino约70万年。
英文摘要：
Using images from the Hubble Space Telescope Wide-Field Camera 3, we measure the rate of diffusion of stars through the core of the globular cluster 47 Tucanae using a sample of young white dwarfs identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the diffusion rate $κ\approx 10-13$ arcsecond$^2$ Myr$^{-1}$ is consistent with theoretical estimates of the relaxation time in the core of 47 Tucanae of about 70 Myr.
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