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arXiv 1912.04522astro-ph.GA
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合并对MaNGA中运动失调和反向旋转Galerkin起源的影响

The Impact of Merging on The Origin of Kinematically Misaligned and Counter-rotating Galaxies in MaNGA

Song-lin Li, Yong Shi, Dmitry Bizyaev, Christopher Duckworth, Ren-bin Yan, Yan-mei Chen, Long-ji Bing, Jian-hang Chen, Xiao-ling Yu, Rogemar A. Riffel

摘要:

星系合并和相互作用预计将发挥重要作用,导致气体和恒星之间的星系运动的偏移。在这里,我们交叉匹配星系在MANGA MPL-8与暗能量光谱仪(DESI)的遗产调查,并确定311个合并的星系有可靠的测量值的$Δ$ PA,恒星和气体运动学位置角之间的差异,以调查合并对气体恒星旋转失调的影响。我们发现,在静止星系和恒星形成星系中,错位星系(30 $^\circ$ $\leqslant$ $Δ$ PA $<$ 150 $^\circ$)的合并率都高于共旋星系(30 $^\circ$)的合并率。这一结果表明,合并是一个过程,产生运动失调。在静止星系和恒星形成星系中,反旋星系($Δ$ PA $\leqslant$ 150 $^\circ$)的合并比例都低于错位星系,而在恒星形成星系中,它甚至可能低于共旋星系。在并合过程中,轨道角动量转移到恒星和气体的自旋,潮汐特征消失,可以导致小的并合分数。许多新的恒星在合并后从气体中继承角动量,可以进一步降低恒星形成的反旋子的合并比例。

英文摘要:

Galaxy mergers and interactions are expected to play a significant role leading to offsets between gas and stellar motions in galaxies. Herein we crossmatch galaxies in MaNGA MPL-8 with the Dark Energy Spectroscopic Instrument (DESI) Legacy Surveys and identify 311 merging galaxies that have reliable measurements of the $Δ$PA, the difference between the stellar and gas kinematic position angles to investigate the impacts of merging on gas-stellar rotation misalignments. We find that the merging fractions of misaligned galaxies (30$^\circ$ $\leqslant$ $Δ$PA $<$150$^\circ$) are higher than that of co-rotators ($Δ$PA $<$ 30$^\circ$) in both quiescent and star-forming galaxies. This result suggests that merging is one process to produce kinematic misalignments. The merging fraction of counter-rotators ($Δ$PA $\leqslant$ 150$^\circ$) is lower than that of misaligned galaxies in both quiescent and star-forming galaxies, while in the latter it is likely even lower than that of co-rotators. The orbital angular momentum transfer to the spins of stars and gas during merging and the tidal feature disappearance can lead to small merging fractions in counter-rotators. Numerous new stars that inherit angular momentum from gas after merging can further lower the merging fraction of star-forming counter-rotators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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