论文标题
射手座A*：iii的正确运动。超级质量黑洞的案例
The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole
论文作者
论文摘要
我们报告了SGR A*相对于两个跨越18年的两个型外生的无线电源的适当运动的基线阵列的测量值。 SGR A*的明显运动为-6.411 +/- 0.008 MAS/YR沿银河平面，-0.219 +/- 0.007 MAS/YR朝北银河极。这种明显的运动几乎完全归因于太阳轨道对银河系中心的影响。去除这些效果的残留物在银河旋转方向上的残留物为2.23 km/s，朝北银河杆的旋转方向和-0.85 +/- 0.75 km/s。在银河平面和垂直于它的运动中，对运动的最大可能分析，预计在银河中心恒星簇中的一个巨大物体表明，辐射源SGR A*包含从Stellar orbits中散发出4 x 10^6 msun的重力质量的25％以上。 Sgr a*的内在尺寸与其Schwarzschild半径相当，> 4 x 10^23 msun/pc^-3的隐含质量密度非常接近于黑洞的预期，这确实提供了压倒性的证据，表明它确实是一个超级质量的黑洞。最后，排除了比3 x 10^4 msun的“中间质量”黑洞的存在更大，而从sgr a*大约0.003至0.1 pc之间。
We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 years. The apparent motion of Sgr A* is -6.411 +/- 0.008 mas/yr along the Galactic plane and -0.219 +/- 0.007 mas/yr toward the North Galactic Pole. This apparent motion can almost entirely be attributed to the effects of the Sun's orbit about the Galactic center. Removing these effects yields residuals of -0.58 +/- 2.23 km/s in the direction of Galactic rotation and -0.85 +/- 0.75 km/s toward the North Galactic Pole. A maximum-likelihood analysis of the motion, both in the Galactic plane and perpendicular to it, expected for a massive object within the Galactic center stellar cluster indicates that the radiative source, Sgr A*, contains more than about 25% of the gravitational mass of 4 x 10^6 Msun deduced from stellar orbits. The intrinsic size of Sgr A* is comparable to its Schwarzschild radius, and the implied mass density of >4 x 10^23 Msun/pc^-3 very close to that expected for a black hole, providing overwhelming evidence that it is indeed a super-massive black hole. Finally, the existence of "intermediate-mass" black holes more massive than 3 x 10^4 Msun between approximately 0.003 and 0.1 pc from Sgr A*are excluded.
