Possible explanation for the surface brightness profile of the stellar disk

Possible explanation for the surface brightness profile of the stellar disk
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对恒星盘表面亮度分布的可能解释

DOI:
10.1140/epjp/i2015-15189-x
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发表时间:
2015-09
期刊:
EPJP
影响因子:
--
通讯作者:
崔朗
崔朗
中科院分区:
其他
文献类型:
--
作者:
康东彪;崔朗

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盘状星系的指数表面亮度轮廓(SBP)至今仍未得到完全解释。在这项研究中,我们将从统计力学的角度来探讨这个问题。本文采用一个简化的模型,它概括了我们以前的工作,着重于三维球形系统,研究盘的径向和垂直分布,并再现了垂直结构的ch ~ 2/N定律。对于径向结构,我们假设速度弥散在径向和切向方向上是各向同性的。在我们的方法中,能量约束消失,解决方案是只适用于一些截断和大尺度长度相对于半径的SBPs。当限制总角动量时,恒星盘的能量和大多数典型盘的径向SBP都能得到很好的描述。因此,恒星盘的径向分布可以由恒星的随机运动和轨道运动决定。然而,我们的模型不能很好地解释那些径向SBPs与内倾角或那些与三指数律的档案,我们应该进一步考虑我们所有的假设的有效性。在我们的拟合中,中心引力被设置为非零,以包括恒星盘中心的非零引力的影响。
The exponential surface brightness profile (SBP) of a disk galaxy still has not been completely explained. In this study, we will explore this issue from the point of view of statistical mechanics. A simplified model is adopted here, which generalizes our previous work focusing on 3-dimensional spherical systems to study the disk’s radial and vertical distribution and reproduces thesech2/Nlaw of the vertical structure. For the radial structure we assume that the velocity dispersion is isotropic in the radial and tangential directions. In our method, the energy constraint vanishes, and the solution is only valid for some SBPs with truncation and large scale lengths relative to radius. When constraining the total angular momentum, the energy of the stellar disk and most of the radial SBPs of typical disks can be well described. Thus, the radial distribution of the stellar disk may be determined by both the random and orbital motions of stars. However, our model does not explain well those radial SBPs with an inner dip or those with a three-exponential law profile, for which we should further consider the validity of all our assumptions. In our fittings, the central gravitational force is set to be nonzero to include the effect of nonzero gravity at the center of the stellar disk.
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