Galerkin高阶并合中心的不平衡性和晃动
Lopsidedness and Sloshing in Centres of Advanced Mergers of Galaxies
摘要：
通过分析2 MASS图像，我们测量了一个高级合并星系样本中心几千秒差距内光度分布的非轴对称性。所有的合并显示出高度的中心不对称性：等照度线的中心显示出惊人的晃动模式，在中心1 kpc内的空间变化高达30%;并且不对称性的傅立叶振幅（m=1）显示出在中心5 kpc内高达0.2的高值。中心的不对称性估计是长期的，持续~几个陀螺或~ 100个当地的动力学时标。这将显著影响该地区的动力学演化，通过帮助燃料的中央活动星系核，也通过导致长期增长的不平衡驱动的隆起。
英文摘要：
We measure the non-axisymmetry in the luminosity distribution in the central few kpc of a sample of advanced mergers of galaxies, by analyzing their 2MASS images. All mergers show a high central asymmetry: the centres of isophotes show a striking sloshing pattern with a spatial variation of upto 30 % within the central 1 kpc; and the Fourier amplitude for lopsidedness (m=1) shows high values upto 0.2 within the central 5 kpc. The central asymmetry is estimated to be long-lived, lasting for ~ a few Gyr or ~ 100 local dynamical timescales. This will significantly affect the dynamical evolution of this region, by helping fuel the central active galactic nucleus, and also by causing the secular growth of the bulge driven by lopsidedness.
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