3D ADAPTIVE MESH REFINEMENT SIMULATIONS OF THE GAS CLOUD G2 BORN WITHIN THE DISKS OF YOUNG STARS IN THE GALACTIC CENTER
3D ADAPTIVE MESH REFINEMENT SIMULATIONS OF THE GAS CLOUD G2 BORN WITHIN THE DISKS OF YOUNG STARS IN THE GALACTIC CENTER
复制标题
银河系中心年轻恒星盘内诞生的气云 G2 的 3D 自适应网格细化模拟
DOI：
10.1088/0004-637x/811/2/155
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Habibi
中科院分区：
文献类型：
--
作者：
M. Schartmann;A. Ballone;Andreas Burkert;S. Gillessen;R. Genzel;O. Pfuhl;F. Eisenhauer;P. Plewa;T. Ott;Elizabeth George;M. Habibi
尘埃、电离气体云G2目前正在距离银河系中心大约2400史瓦西半径的地方经过这个巨大的黑洞。我们探索了在年轻恒星盘内的云的起点的可能性。我们利用大量的新观测来对G2的起源进行约束。将观测结果解释为弥漫的气体云，我们使用冥王星代码进行三维流体动力学自适应网格细化（AMR）模拟，并与观测数据进行了详细的比较。本文的模拟在多个方面更新了我们之前得到的结果：(1)使用了高分辨率的三维流体动力学AMR模拟，(2)云遵循基于Brackett-γ数据的更新轨道，(3)与观测到的高质量位置-速度（PV）图和总Brackett-γ光度的演变进行了详细比较。我们专注于扩散云场景中两个尚未解决的问题：在第一次探测之前不久的非物理形成时期和模拟中获得的过于陡峭的布兰克特-γ光曲线，而观测表明布兰克特-γ光度在2004年至2013年之间是恒定的。对于给定的大气和云团，我们发现了一个一致的模型，可以解释观测到的布拉克特-γ光曲线和所有时代的PV图。假设初始压力与大气平衡，这可以在大约1900年之前达到开始日期，这是接近载婴中心的，并且在年轻恒星的圆盘内。
The dusty, ionized gas cloud G2 is currently passing the massive black hole in the Galactic Center at a distance of roughly 2400 Schwarzschild radii. We explore the possibility of a starting point of the cloud within the disks of young stars. We make use of the large amount of new observations in order to put constraints on G2's origin. Interpreting the observations as a diffuse cloud of gas, we employ three-dimensional hydrodynamical adaptive mesh refinement (AMR) simulations with the PLUTO code and do a detailed comparison with observational data. The simulations presented in this work update our previously obtained results in multiple ways: (1) high resolution three-dimensional hydrodynamical AMR simulations are used, (2) the cloud follows the updated orbit based on the Brackett-γ data, (3) a detailed comparison to the observed high-quality position–velocity (PV) diagrams and the evolution of the total Brackett-γ luminosity is done. We concentrate on two unsolved problems of the diffuse cloud scenario: the unphysical formation epoch only shortly before the first detection and the too steep Brackett-γ light curve obtained in simulations, whereas the observations indicate a constant Brackett-γ luminosity between 2004 and 2013. For a given atmosphere and cloud mass, we find a consistent model that can explain both, the observed Brackett-γ light curve and the PV diagrams of all epochs. Assuming initial pressure equilibrium with the atmosphere, this can be reached for a starting date earlier than roughly 1900, which is close to apo-center and well within the disks of young stars.
DOI：
10.1088/0004-637x/750/1/58
发表时间：
2012-01
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Burkert;M. Schartmann;C. Alig;S. Gillessen;R. Genzel;T. Fritz;F. Eisenhauer
通讯作者：
A. Burkert;M. Schartmann;C. Alig;S. Gillessen;R. Genzel;T. Fritz;F. Eisenhauer