关于高海拔疏散星团在Milky Way星系潮中的生存
On the Survival of High-Altitude Open Clusters within the Milky Way Galaxy Tides
摘要：
一个普遍的假设是，高海拔的疏散星团比靠近银河平面的星团寿命更长。这是因为在高海拔地区，疏散星团远离平面内子结构的破坏性影响，如螺旋臂、分子云和棒。然而，在这种情况下需要考虑的一个重要方面是，高海拔疏散星团的轨道最终会穿过银河平面，那里的盘的垂直潮汐场很强。在这项工作中，我们模拟了疏散星团与一个详细的银河系模型的潮汐场在不同的平均高度和银心半径的相互作用。我们发现，集群的预期寿命随着最大轨道高度的增加而减少，并在大约600 pc的高度达到最小值。靠近银道面的星系团寿命更长，因为它们不会经历来自银盘的强烈垂直潮汐冲击;然后，对于轨道高度高于600 pc的星系团，由于与银盘相遇的次数减少，它们又开始寿命更长。通过我们的研究，我们发现，在武器区域和酒吧的潮汐的压缩性质有一个重要的作用，对小集群的生存，保护他们免受破坏：集群内的武器可以活长达两倍的武器外在类似的银河中心距离。
英文摘要：
It is a common assumption that high-altitude open clusters live longer compared with clusters moving close to the Galactic plane. This is because at high altitudes, open clusters are far from the disruptive effects of in-plane substructures, such as spiral arms, molecular clouds and the bar. However, an important aspect to consider in this scenario is that orbits of high-altitude open clusters will eventually cross the Galactic plane, where the vertical tidal field of the disk is strong. In this work we simulate the interaction of open clusters with the tidal field of a detailed Milky Way Galactic model at different average altitudes and galactocentric radii. We find that the life expectancy of clusters decreases as the maximum orbital altitude increases and reaches a minimum at altitudes of approximately 600 pc. Clusters near the Galactic plane live longer because they do not experience strong vertical tidal shocks from the Galactic disk; then, for orbital altitudes higher than 600 pc, clusters start again to live longer due to the decrease in the number of encounters with the disk. With our study, we find that the compressive nature of the tides in the arms region and the bar have an important role on the survival of small clusters by protecting them from disruption: clusters inside the arms can live up to twice as long as those outside the arms at similar galactocentric distance.
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