科研之友
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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 (47 Tuc) using a sample of young white dwarfs that were identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the diffusion rate k approximate to 10-13 arcsec(2) Myr(-1) is consistent with theoretical estimates of the relaxation time in the core of 47 Tuc of about 70 Myr.
- 出版日期2015-5-1
- 单位Perugia
