A UNIFIED FRAMEWORK FOR THE ORBITAL STRUCTURE OF BARS AND TRIAXIAL ELLIPSOIDS
A UNIFIED FRAMEWORK FOR THE ORBITAL STRUCTURE OF BARS AND TRIAXIAL ELLIPSOIDS
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棒体和三轴椭球轨道结构的统一框架
DOI：
10.3847/0004-637x/818/2/141
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发表时间：
2015-12
期刊：
影响因子：
--
通讯作者：
Victor P. Debattista
中科院分区：
文献类型：
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作者：
Monica Valluri;Juntai Shen;Caleb Abbott;Victor P. Debattista
我们在两个N体杆的自洽模拟中检验了一个大的随机轨道样本。对这些条形中的轨道进行了视觉分类，并使用了一种基于频率分析的新的自动轨道分类方法。众所周知的PROGRADE x1轨道家族与静止和旋转的三轴椭球中的盒子轨道起源于相同的母轨道。然而，只有一小部分杆状轨道(∼4%)像它们的周期性母轨道一样具有主要的前进运动。由x1轨道产生的大多数杆状轨道在杆系中的净角动量很小，这使得它们等同于旋转三轴势中的盒子轨道。在这些模拟中，一小部分杆状轨道(∼7%)是长轴管，其行为与三轴椭球中的长轴管完全相同：由于科里奥利力，它们围绕中间轴倾斜，倾斜感由它们围绕长轴的角动量符号决定。在纯杆模型中没有发现以x2周期轨道为母体的轨道，但发现了一小部分(∼2%)以x4轨道为母体的短轴管状轨道。当代表超大质量黑洞(SMBH)的中心点质量在棒的中心绝热生长时，位于SMBH附近的那些轨道被转化为属于同一主要家族(短轴管、长轴管和盒子)的以更大半径占据棒的进动开普勒式轨道。在SMBH的生长过程中，质量的流入和角动量的向外传输将一些x1管和长轴管的轨道转变为递进的短轴管。这项研究对于未来试图使用基于轨道的方法，如施瓦茨柴尔德轨道叠加方案来限制禁止星系中SMBH的质量，以及理解禁止星系中的观测特征，具有重要的意义。
We examine a large random sample of orbits in two self-consistent simulations of N-body bars. Orbits in these bars are classified both visually and with a new automated orbit classification method based on frequency analysis. The well-known prograde x1 orbit family originates from the same parent orbit as the box orbits in stationary and rotating triaxial ellipsoids. However, only a small fraction of bar orbits (∼4%) have predominately prograde motion like their periodic parent orbit. Most bar orbits arising from the x1 orbit have little net angular momentum in the bar frame, making them equivalent to box orbits in rotating triaxial potentials. In these simulations a small fraction of bar orbits (∼7%) are long-axis tubes that behave exactly like those in triaxial ellipsoids: they are tipped about the intermediate axis owing to the Coriolis force, with the sense of tipping determined by the sign of their angular momentum about the long axis. No orbits parented by prograde periodic x2 orbits are found in the pure bar model, but a tiny population (∼2%) of short-axis tube orbits parented by retrograde x4 orbits are found. When a central point mass representing a supermassive black hole (SMBH) is grown adiabatically at the center of the bar, those orbits that lie in the immediate vicinity of the SMBH are transformed into precessing Keplerian orbits that belong to the same major families (short-axis tubes, long-axis tubes and boxes) occupying the bar at larger radii. During the growth of an SMBH, the inflow of mass and outward transport of angular momentum transform some x1 and long-axis tube orbits into prograde short-axis tubes. This study has important implications for future attempts to constrain the masses of SMBHs in barred galaxies using orbit-based methods like the Schwarzschild orbit superposition scheme and for understanding the observed features in barred galaxies.
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DOI：
10.1088/0004-637x/728/2/128
发表时间：
2010-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Alex Deibel;M. Valluri;D. Merritt
通讯作者：
Alex Deibel;M. Valluri;D. Merritt
DOI：
10.1086/519229
发表时间：
2006-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
T. Lauer;K. Gebhardt;S. Faber;D. Richstone;S. Tremaine;J. Kormendy;M. Aller;R. Bender;A. Dressler;A. Filippenko;R. Green;L. Ho
通讯作者：
T. Lauer;K. Gebhardt;S. Faber;D. Richstone;S. Tremaine;J. Kormendy;M. Aller;R. Bender;A. Dressler;A. Filippenko;R. Green;L. Ho
DOI：
10.1088/0004-637x/778/2/151
发表时间：
2013-05
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Jonathan S. Brown;M. Valluri;Juntai Shen;V. Debattista
通讯作者：
Jonathan S. Brown;M. Valluri;Juntai Shen;V. Debattista
具有来自 N 体模拟的初始密度的银河棒史瓦西模型
影响因子：
4.8
作者：
Wang, Yougang;Mao, Shude;Long, Richard J.;Shen, Juntai
通讯作者：
Shen, Juntai
影响因子：
4.8
作者：
G. Contopoulos;M. Harsoula
通讯作者：
G. Contopoulos;M. Harsoula