论文标题
关于从太空成像射手座a*的前景
On the prospects of imaging Sagittarius A* from space
论文作者
论文摘要
亚毫米波的非常长的基线干涉法（VLBI）具有图像银河中心中黑洞的阴影，Sagittarius A*（SGR A*），从而测试了对一般相对论理论的基本预测。我们研究了新的太空vlbi任务概念的成像前景。该设置由两条卫星组成，这些卫星具有略有不同的半径的极性或赤道圆形圆形轨道，导致螺旋形的紫外线覆盖，具有长基线，可实现极高的高分辨率和高效的无线电源成像。我们模拟了SGR A*的一般相对论磁性流体动力学模型的观察结果，以使用模型系统参数计算出的噪声。在将$ UV $ - 平面和平均可见度累积后，可以重建的SGR A*累积的可见度，该图像的分辨率最高为4 $μ$，从而使一般相对性和积聚模型的测试比地面VLBI进行了更强的测试。
Very Long Baseline Interferometry (VLBI) at sub-millimeter waves has the potential to image the shadow of the black hole in the Galactic Center, Sagittarius A* (Sgr A*), and thereby test basic predictions of the theory of general relativity. We investigate the imaging prospects of a new Space VLBI mission concept. The setup consists of two satellites in polar or equatorial circular Medium-Earth Orbits with slightly different radii, resulting in a dense spiral-shaped uv-coverage with long baselines, allowing for extremely high-resolution and high-fidelity imaging of radio sources. We simulate observations of a general relativistic magnetohydrodynamics model of Sgr A* for this configuration with noise calculated from model system parameters. After gridding the $uv$-plane and averaging visibilities accumulated over multiple months of integration, images of Sgr A* with a resolution of up to 4 $μ$as could be reconstructed, allowing for stronger tests of general relativity and accretion models than with ground-based VLBI.
