HYDRODYNAMICAL SIMULATIONS OF A COMPACT SOURCE SCENARIO FOR THE GALACTIC CENTER CLOUD G2
HYDRODYNAMICAL SIMULATIONS OF A COMPACT SOURCE SCENARIO FOR THE GALACTIC CENTER CLOUD G2
复制标题
银河系中心云 G2 紧凑源场景的流体力学模拟
DOI：
10.1088/0004-637x/776/1/13
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Ott
中科院分区：
文献类型：
--
作者：
A. Ballone;M. Schartmann;A. Burkert;S. Gillessen;R. Genzel;T. Fritz;F. Eisenhauer;O. Pfuhl;T. Ott
在银河系中心发现的致密气体云G2的起源仍然是一个有争议的谜题。G2可能是一个漫射云，也可能是嵌入其中的一颗不可见恒星流出物的结果。我们提出了流体动力学模拟的演化不同的球对称风的恒星对象嵌入在G2。我们发现，在这种源情景下，必须考虑与周围介质的相互作用和银河系中心超大质量黑洞的极端引力场。热而稠密的大气的热压力限制了风，而它的撞击压力通过沿轨道剥离来塑造风，其细节取决于风的参数。潮汐力挤压中心附近的风，使其变成细长的细丝。我们还发现，在这种情况下，大部分Brγ亮度预计来自风的密度最大的部分，它具有高丝状结构和低填充因子。对于我们假设的大气，观测结果可以用质量流出率和风速vw = 50 km s−1来最好地匹配。这些值与年轻的金牛座T星风的值相当，正如Scoville和Burkert已经提出的那样。
The origin of the dense gas cloud G2 discovered in the Galactic Center is still a debated puzzle. G2 might be a diffuse cloud or the result of an outflow from an invisible star embedded in it. We present hydrodynamical simulations of the evolution of different spherically symmetric winds of a stellar object embedded in G2. We find that the interaction with the ambient medium and the extreme gravitational field of the supermassive black hole in the Galactic Center must be taken into account in such a source scenario. The thermal pressure of the hot and dense atmosphere confines the wind, while its ram pressure shapes it via stripping along the orbit, with the details depending on the wind parameters. Tidal forces squeeze the wind near pericenter, reducing it to a thin and elongated filament. We also find that in this scenario most of the Brγ luminosity is expected to come from the densest part of the wind, which has a highly filamentary structure with a low filling factor. For our assumed atmosphere, the observations can be best matched by a mass outflow rate of and a wind velocity of vw = 50 km s−1. These values are comparable with those of a young T Tauri star wind, as already suggested by Scoville & Burkert.
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