论文标题
检测带有重力sgra*附近的微弱恒星
Detection of faint stars near SgrA* with GRAVITY
论文作者
论文摘要
可以原则上可以通过准确测量恒星的轨道来测量位于银河中心的超质量黑洞的自旋，这些恒星的轨道比S2的恒星的轨道比S2更接近SGRA*，该轨道最近提供了对重力红移和Schwarzschild prepession的测量。将VLT的四个8M望远镜结合的重力近红外干涉仪器提供了2-4 MAS的空间分辨率，从而打破了自适应播放术的混淆屏障和单个8-10m望远镜的混淆屏障。我们使用重力在2019年的六个月内观察SGRA*，并采用了射电天文学中开发的干涉测量方法来寻找SGRA*附近的微弱对象。这揭示了在SGRA*30MAS内的K带中缓慢移动的恒星18.9。恒星的位置和适当的运动与先前已知的星S62一致，该恒星S62的物理距离大大较大，但在投影中，接近SGRA*。 2019年8月和9月的观察很容易检测到S29，k-ragnitude为16.6，来自SGRA*的大约130个MAS。计划的重力升级以及校准的进一步改进，具有与K的幅度19相比，发现恒星的希望。
The spin of the supermassive black hole that resides at the Galactic Centre can in principle be measured by accurate measurements of the orbits of stars that are much closer to SgrA* than S2, the orbit of which recently provided the measurement of the gravitational redshift and the Schwarzschild precession. The GRAVITY near-infrared interferometric instrument combining the four 8m telescopes of the VLT provides a spatial resolution of 2-4 mas, breaking the confusion barrier for adaptive-optics-assisted imaging with a single 8-10m telescope. We used GRAVITY to observe SgrA* over a period of six months in 2019 and employed interferometric reconstruction methods developed in radio astronomy to search for faint objects near SgrA*. This revealed a slowly moving star of magnitude 18.9 in K band within 30mas of SgrA*. The position and proper motion of the star are consistent with the previously known star S62, which is at a substantially larger physical distance, but in projection passes close to SgrA*. Observations in August and September 2019 easily detected S29, with K-magnitude of 16.6, at approximately 130 mas from SgrA*. The planned upgrades of GRAVITY, and further improvements in the calibration, hold the promise of finding stars fainter than magnitude 19 at K.
