论文标题
银河系中心的小螺旋形的三维分析：黑洞的轨道参数，周期和质量
Three-dimensional analysis of the Minispiral at the Galactic Center: orbital parameters, periods and the mass of the black hole
论文作者
论文摘要
在本文中，我们同时适合超大质量黑洞周围电离气体的轨道和视线速度，射手座a $^{\ ast} $（sgr a $^{\ ast} $），在银河系中心。我们使用的数据是使用Feldmeier-Krause等人提供的K波段多对象光谱仪（KMO）的。 （2015年），并覆盖银河系中的中央$ \ sim $ 2 PC。从K波段的BR $γ$线中的最明亮的气体排放线中，我们得出了微螺旋中气体的空间分布和视线速度。使用通量分布和视线速度信息，我们使用贝叶斯建模方法对微型螺旋，北部臂，东部臂和西部弧的三个主要燃气流媒体进行拟合，并能够重建这些气流液的三维轨道。使用最合适的轨道参数和测量线速度，我们限制了sgr a $^{\ ast} $的质量。东部臂的轨道是使用我们的数据最好限制的轨道。它给出了$ 17.4 _ { - 11.6}^{+31.0} \ cdot 10^3 $年的最佳拟合轨道周期，并导致质量为$ 14.9 _ { - 10.4}^{+69.4} {+69.4} \ cdot 10^6 m _ _ _ {\ odot}。
In this paper we simultaneously fit the orbits and line-of-sight velocities of the ionized gas around the supermassive black hole, Sagittarius A$^{\ast}$ (Sgr A$^{\ast}$), at the center of the Milky Way. The data we use are taken with the K-band Multi Object Spectrograph (KMOS), presented in Feldmeier-Krause et al. (2015) and cover the central $\sim$ 2 pc of the Milky Way. From the brightest gas emission line in the K-band, the Br$γ$ line, we derive the spatial distribution and line-of-sight velocities of the gas in the minispiral. Using the flux distribution and the line-of-sight velocity information, we perform a fit to the three main gas streamers in the minispiral, the Northern Arm, Eastern Arm, and Western Arc, using a Bayesian modelling method, and are able to reconstruct the three-dimensional orbits of these gas streamers. With the best fit orbital parameters and the measured line-of-sight velocities, we constrain the mass of Sgr A$^{\ast}$. The orbit of the Eastern Arm is the one that is best constrained using our data. It gives a best-fit orbital period of $17.4_{-11.6}^{+31.0}\cdot 10^3$ years and results in an enclosed mass of $14.9_{-10.4}^{+69.4}\cdot 10^6 M_{\odot}.$
