تقرير
The Impact of Merging on The Origin of Kinematically Misaligned and Counter-rotating Galaxies in MaNGA
| العنوان: | The Impact of Merging on The Origin of Kinematically Misaligned and Counter-rotating Galaxies in MaNGA |
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| المؤلفون: | Li, Song-lin, Shi, Yong, Bizyaev, Dmitry, Duckworth, Christopher, Yan, Ren-bin, Chen, Yan-mei, Bing, Long-ji, Chen, Jian-hang, Yu, Xiao-ling, Riffel, Rogemar A. |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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 $\Delta$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$^\circ$ $\leqslant$ $\Delta$PA $<$150$^\circ$) are higher than that of co-rotators ($\Delta$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 ($\Delta$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. Comment: 11 pages, 6 figures, accepted by MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/staa3618 |
| URL الوصول: | http://arxiv.org/abs/1912.04522 |
| رقم الأكسشن: | edsarx.1912.04522 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/staa3618 |
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