arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.1020astro-ph
收藏

旋转有限云向中心物体吸积的解析解I。牛顿方法

Analytic solutions to the accretion of a rotating finite cloud towards a central object I. Newtonian approach

S. Mendoza, E. Tejeda, E. Nagel

摘要:

我们建立了一个稳定的分析吸积流模型的有限旋转气体云吸积材料的中心引力对象。流动的压力梯度被认为是可忽略的,因此,流动是弹道的。我们还假设一个稳定的流动,并考虑在球形云的边界处的粒子作为一个刚体旋转,具有固定量的向内径向速度。这是对Ulrich(1976)描述的传统无限气体云模型的推广。我们表明,流线和密度分布得到很大程度上偏离乌尔里希计算的。在模型上的参数的选择额外的自由度可以自然地解释在密集的集群中形成的原恒星的触发机制,在各种各样的外部物理机制确定的边界条件的研究。此外,正如预期的那样,该模型预测在中心物体周围形成一个赤道吸积盘,其半径与Ulrich(1976)计算的半径不同。

英文摘要:

We construct a steady analytic accretion flow model for a finite rotating gas cloud that accretes material to a central gravitational object. The pressure gradients of the flow are considered to be negligible and so, the flow is ballistic. We also assume a steady flow and consider the particles at the boundary of the spherical cloud to be rotating as a rigid body, with a fixed amount of inwards radial velocity. This represents a generalisation to the traditional infinite gas cloud model described by Ulrich (1976). We show that the streamlines and density profiles obtained deviate largely from the ones calculated by Ulrich. The extra freedom in the choice of the parameters on the model can naturally account for the study of protostars formed in dense clusters by triggered mechanisms, where a wide variety of external physical mechanisms determine the boundary conditions. Also, as expected, the model predicts the formation of an equatorial accretion disc about the central object with a radius different from the one calculated by Ulrich (1976).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑