SgrA周围大质量恒星的原位形成
In situ formation of the massive stars around SgrA*
摘要：
围绕SgrA* 的大质量年轻恒星的形成仍然是一个悬而未决的问题。在本文中，我们模拟了一个等温的，湍流分子云对银河系中心（GC）的下落。当它螺旋式地向GC移动时，分子云在SgrA* 周围形成一个小而致密的圆盘。预计在这样一个致密的盘中会发生有效的恒星形成（SF）。我们通过下沉粒子来模拟SF。在约6x10^5年时，约6000太阳质量的恒星已经形成，并被限制在一个内外半径分别为0.06和0.5 pc的薄圆盘内。因此，这项初步研究表明，分子云的陷落是SgrA* 周围形成大质量恒星的可行方案。进一步的研究与更现实的辐射物理和SF将需要更好地约束这个有趣的场景。
英文摘要：
The formation of the massive young stars surrounding SgrA* is still an open question. In this paper, we simulate the infall of an isothermal, turbulent molecular cloud towards the Galactic Centre (GC). As it spirals towards the GC, the molecular cloud forms a small and dense disc around SgrA*. Efficient star formation (SF) is expected to take place in such a dense disc. We model SF by means of sink particles. At ~6x10^5 yr, ~6000 solar masses of stars have formed, and are confined within a thin disc with inner and outer radius of 0.06 and 0.5 pc, respectively. Thus, this preliminary study shows that the infall of a molecular cloud is a viable scenario for the formation of massive stars around SgrA*. Further studies with more realistic radiation physics and SF will be required to better constrain this intriguing scenario.
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