论文标题
重力镜头在SGR a*的恒星轨道重建中的影响
The impact of gravitational lensing in the reconstruction of stellar orbits around Sgr A*
论文作者
论文摘要
在过去几年中，重力合作的惊人发现在银河系中心绕着Black Sgr A*绕的STAR S2进行了详细研究之后，我们详细介绍了重力镜头对这个巨大的黑洞周围重建恒星轨道的影响。我们评估了对恒星S2，S38和S55的镜头天文效应，以及这些如何系统地影响衍生的轨道参数。效果低于当前的不确定性，但不可忽略。通过对这些恒星进行更多的观察，可以使镜头从统计噪声中出现并最终检测到的天体转移。 通过重复对较小的半轴轴$ a $和各种倾向$ i $的分析，我们可以量化对更广泛参数的镜头效果。如预期的那样，对于较小的半轴轴和几乎边缘的轨道镜头效应的效果增加了大约一个数量级。
After the amazing discoveries by the GRAVITY collaboration in the last few years on the star S2 orbiting the black hole Sgr A* in the center of the Milky Way, we present a detailed investigation of the impact of gravitational lensing on the reconstruction of stellar orbits around this massive black hole. We evaluate the lensing astrometric effects on the stars S2, S38 and S55 and how these systematically affect the derived orbital parameters. The effect is below current uncertainties, but not negligible. With the addition of more observations on these stars, it will be possible to let the astrometric shift by lensing emerge from the statistical noise and be finally detected. By repeating the analysis on a smaller semimajor axis $a$ and various inclinations $i$, we are able to quantify the lensing effects on a broader range of parameters. As expected, for smaller semimajor axes and for nearly edge-on orbits lensing effects increase by about an order of magnitude.
