论文标题
银河系的核恒星光盘的牛仔裤建模
Jeans modelling of the Milky Way's nuclear stellar disc
论文作者
论文摘要
核恒星盘（NSD）是一种扁平的恒星结构，在半乳半层次中占主导地位的重力潜力$ 30 \ sillsim r \ lyssim 300 {\，\ rm pc} $。在本文中，我们基于先前的光度研究构建了NSD的轴对称牛仔裤动力学模型，并将它们适合于Apogee和Sio Maser星的视线运动线。我们发现（i）NSD质量较低，但与Launhardt等人从光度法独立确定的质量一致。 （2002）。我们的基准模型的质量包含在球形半径$ r = 100 {\，\ rm pc} $的$ m（r <100 {\，\ rm pc}）= 3.9 \ pm 1 \ pm 1 \ pm 1 \ pm 1 \ times 10^8 {\，\ rm m_ \ odot} $和$ m m pm的总质量为$ m _ ns. {\，\ rm m_ \ odot} $。 （ii）NSD可能是垂直偏置光盘的第一个示例，即具有垂直和径向速度分散$σ_z/σ_r> 1 $之间的比率。中央分子区域中星形分子气体的观测和理论模型表明，在恒星出生时可能已经印刷了较大的垂直振荡。但是，发现$σ_z/σ_r> 1 $取决于最内向的速度分散量的下降，因为我们假设NSD是轴对称是轴对称的，并且可用的（灭绝校正）的星形样本广泛地跟踪了下层的光和质量分布，所有这些都需要与未来或未来的建模来建立。 （iii）我们为我们的银河系的最内向的$ 500 {\，\ rm pc}提供了迄今为止最准确的旋转曲线。
The nuclear stellar disc (NSD) is a flattened stellar structure that dominates the gravitational potential of the Milky Way at Galactocentric radii $30 \lesssim R \lesssim 300{\, \rm pc}$. In this paper, we construct axisymmetric Jeans dynamical models of the NSD based on previous photometric studies and we fit them to line-of-sight kinematic data of APOGEE and SiO maser stars. We find that (i) the NSD mass is lower but consistent with the mass independently determined from photometry by Launhardt et al. (2002). Our fiducial model has a mass contained within spherical radius $r=100{\, \rm pc}$ of $M(r<100{\, \rm pc}) = 3.9 \pm 1 \times 10^8 {\, \rm M_\odot}$ and a total mass of $M_{\rm NSD} = 6.9 \pm 2 \times 10^8 {\, \rm M_\odot}$. (ii) The NSD might be the first example of a vertically biased disc, i.e. with ratio between the vertical and radial velocity dispersion $σ_z/σ_R>1$. Observations and theoretical models of the star-forming molecular gas in the central molecular zone suggest that large vertical oscillations may be already imprinted at stellar birth. However, the finding $σ_z/σ_R > 1$ depends on a drop in the velocity dispersion in the innermost few tens of parsecs, on our assumption that the NSD is axisymmetric, and that the available (extinction corrected) stellar samples broadly trace the underlying light and mass distributions, all of which need to be established by future observations and/or modelling. (iii) We provide the most accurate rotation curve to date for the innermost $500 {\, \rm pc}$ of our Galaxy.
