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20160109 談對恆星在絲狀暗星雲中形成作數值模擬

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發表於 2016-1-8 16:45:53 | 顯示全部樓層 |閱讀模式
各位:

榮幸請到TAG第一任组長,李北城博士,天體物理學家,到來做高级科普報告。
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日期:2016年1月9日,14:15 至 15:30
地點:理大QR513室
語言:廣東話

題目:談對恆星在絲狀暗星雲中形成作數值模擬

abstract:
Observations show that the star formation process starts from the giant molecular cloud (GMC) complex of several tens of parsecs all the way down to the formation of protostars at the size scale of solar radius. (9 orders of magnitude in spatial scale) . In between, we observe long filamentary dark clouds, large molecular cloud clumps, dense cloud cores which house protostellar formation, and protostellar accretion disks. Numerical simulation becomes a powerful tool to understand and connect these observational snapshots of the whole star formation process. Multiply coupled highly non-linear physics are involved in the process, including magnetic field, supersonic turbulence, gravity, radiation and protostellar outflow feedback. It is a challenge to simulate the entire process in a single numerical simulation. To achieve such a long-term challenge, we need efficient adaptive codes, such as adaptive mesh refinement (AMR) code, that can manage memory usage efficiently and are highly scalable on large-scale high performance supercomputers.
In this talk, I present some highlights of our simulation results, using our radiative-magnetohydrodynamics AMR code "ORION2", on (1) the intertwined filamentary structure of dark clouds, (2) the magnetic properties of the dense cloud clumps, and (3) the protostellar cluster formation in a highly supersonic turbulence region of 4.55 parsecs in size to the maximum resolution of 28 astronomical units.  Our simulation results  match well with the latest observations and provide important insight into the process of star formation at different size scales.
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