A Schwarzschild model of the Galactic bar with initial density from N-body simulations

A Schwarzschild model of the Galactic bar with initial density from N-body simulations
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具有来自 N 体模拟的初始密度的银河棒史瓦西模型

DOI:
10.1093/mnras/stt1537
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发表时间:
2013-08
影响因子:
4.8
通讯作者:
Shen, Juntai
Shen, Juntai
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang, Yougang;Mao, Shude;Long, Richard J.;Shen, Juntai

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利用N体模拟得到的势,我们用Schwarzschild方法构造了银河棒模型。通过改变模式速度和杆的位置角度,我们发现最佳拟合的杆模型具有模式速度(p)= 40 km s(-1)kpc(-1),杆角度θ(bar)= 45度。N体模拟表明,最佳拟合模型是稳定的超过1.5 Gyr。结合Wang等人的结果,我们发现,在我们的史瓦西模型中,杆角度和/或图案速度没有很好地受到膨胀径向速度测定数据的约束。从我们的模型预测的自行略大于在四个领域中观察到的。未来,更多来自地面和空间观测的运动学数据将使我们能够改进银河系棒的模型。
Using the potential from N-body simulations, we construct the Galactic bar models with the Schwarzschild method. By varying the pattern speed and the position angle of the bar, we find that the best-fitting bar model has pattern speed (p) = 40 km s(-1) kpc(-1), and bar angle theta(bar) = 45 degrees. N-body simulations show that the best-fitting model is stable for more than 1.5 Gyr. Combined with the results in Wang et al., we find that the bar angle and/or the pattern speed are not well constrained by Bulge Radial Velocity Assay data in our Schwarzschild models. The proper motions predicted from our model are slightly larger than those observed in four fields. In the future, more kinematic data from the ground- and space-based observations will enable us to refine our model of the Milky Way bar.
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