具有恒星反旋现象的星系的详细研究
Detailed study of galaxies with the stellar counter-rotation phenomenon
摘要：
星系盘生长的过程仍然没有完全了解。在大多数盘状星系中，气体和恒星位于同一平面，并沿同一方向旋转。然而，有一些运动学上奇特的星系拥有两个反向旋转的恒星盘。它们的起源被认为是过去气体吸积和恒星形成的结果。通过研究这样的星系，我们可以了解有多少物质，何时以及如何落入祖先星系。我们在MaNGA IFU调查中确定了56个反向旋转星系的样本，并在6米望远镜（BTA）上发起了后续观测活动，旨在确定两个恒星盘的恒星星族属性。我们的初步结果表明，反旋转星系的样本的二分法。我们发现大多数大质量星系都有扩展的反向旋转盘，其对光度的贡献高于小质量星系，暗示了不同的演化路径。
英文摘要：
The process of galactic disc growing is still not fully understood. In the majority of disk galaxies the gas and stars are located in the same plane and rotate in the same direction. However, there are kinematically peculiar galaxies hosting two counter-rotating stellar discs. Their origin is believed to be the result of a past event of accretion of gas followed by star formation. By studying such galaxies we can learn how much material, when, and how, have fallen onto the progenitor galaxy. We identified a sample of 56 counter-rotating galaxies in the MaNGA IFU survey and initiated a follow-up observing campaign at the 6-m telescope (BTA) aiming to determine the stellar population properties of both stellar discs. Our preliminary results suggest the dichotomy of the sample of counter-rotating galaxies. We found that most massive galaxies have extended counter-rotating disks, whose contribution to luminosity is higher than in the less massive galaxies suggestive of different evolutionary paths.
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