条形能腐蚀尖齿晕吗？
Can Bars Erode Cuspy Halos ?
摘要：
核心尖点问题是Lambda CDM宇宙学模型的一个主要的和广为人知的小尺度问题。在这项研究中，我们调查是否可以解决这个问题，利用酒吧的不稳定性。我们看到，在我们的模拟中，所有的初始条都是薄的（b/a $<$ 0.3），并且在高分辨率模拟中，条变得更厚（b/a $>$ 0.3$）。通过增加分辨率，我们意味着更大数量的磁盘颗粒。在高分辨率模拟中，较厚的棒向晕传递的角动量较少。因此，我们发现，在高分辨率的模拟，它需要约7 Gyr的酒吧，以消除内部的暗物质尖点，这是太长了，是有意义的星系演化的时间尺度。从物理上讲，原因是随着分辨率的增加，条形图的缩放速度更快，并且在更早的时候变得更厚。
英文摘要：
One of the major and widely known small scale problem with the Lambda CDM model of cosmology is the core-cusp problem. In this study we investigate whether this problem can be resolved using bar instabilities. We see that all the initial bars are thin (b/a $<$ 0.3) in our simulations and the bar becomes thick (b/a $>$ 0.3$) faster in the high resolution simulations. By increasing the resolution, we mean a larger number of disk particles. The thicker bars in the high resolution simulations transfer less angular momentum to the halo. Hence, we find that in the high resolution simulations it takes around 7 Gyr for the bar to remove inner dark matter cusp which is too long to be meaningful in galaxy evolution timescales. Physically, the reason is that as the resolution increases, the bar buckles faster and becomes thicker much earlier on.
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