蚂蚁星云中心的一个圆盘
A disc in the heart of the Ant nebula
摘要：
我们提出了在行星状星云Mz 3（蚂蚁）中心发现的硅酸盐盘。这个星云是用甚大望远镜干涉仪（VLTI）上的望远镜观测到的。在不同方向上获得的星云清晰地表明在星云的中心存在一个尘埃，几乎是边缘的圆盘。在我们的中红外光谱和可见度曲线中可以清楚地看到无定形硅酸盐的吸收特征。我们使用辐射转移蒙特卡罗模拟来约束圆盘的几何和物理参数。我们推导出的内半径为9 AU（~ 6 mas，假设D=1.4kpc）。该圆盘垂直于光学双极流出，但比光学双极流出小10^{3}倍。
英文摘要：
We present the discovery of a silicate disc at the centre of the planetary nebula Mz3 (the Ant). The nebula was observed with MIDI on the Very Large Telescope Interferometer (VLTI). The visibilities obtained at different orientations clearly indicate the presence of a dusty, nearly edge-on disc in the heart of the nebula. An amorphous silicate absorption feature is clearly seen in our mid-IR spectrum and visibility curves. We used radiative transfer Monte Carlo simulations to constrain the geometrical and physical parameters of the disc. We derive an inner radius of 9 AU (~6mas assuming D=1.4kpc). This disc is perpendicular to, but a factor of 10^{3} smaller than the optical bipolar outflow.
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