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• W2950002013 abstract "Recent observational studies have revealed that the Galactic bulge has cylindrical rotation and a steeper vertical metallicity gradient. We adopt two representative models for the bulge formation and thereby investigate whether the two models can explain both the observed cylindrical rotation and vertical metallicity gradient in a self-consistent manner. One is the pure disk scenario (PDS) in which the bulge is formed from a pure thin stellar disk through spontaneous bar instability. The other is the two-component disk scenario (TCDS) in which the bulge is formed from a disk composed of thin and thick disks through bar instability. Our numerical simulations show that although PDS can reproduce the cylindrical rotation, it shows a rather flatter vertical metallicity gradient that is inconsistent with observations. The derived flatter metallicity gradient is due to the vertical mixing of stars with different initial metallicities by the stellar bar. This result implies that the bulge can not be simply formed from a pure thin stellar disk. On the other hand, the bulge formed from the two-component disk in TCDS can explain both the observed cylindrical rotation and vertical metallicity gradient of the Galactic bulge reasonably well. In TCDS, more metal-poor stars at higher |z| (vertical distance) which originate from the already dynamically hotter thick disk can not be strongly influenced by vertical mixing of the bar so that they can stay in situ for longer timescales and thus keep the lower metallicity at higher |z|. Consequently, the vertical metallicity gradient of the bulge composed of initially thin and thick disk stars can not be so flattened, even if the gradient of the thin disk can be flattened significantly by the bar in TCDS." @default.
• W2950002013 created "2019-06-27" @default.
• W2950002013 creator A5050379623 @default.
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• W2950002013 date "2011-07-18" @default.
• W2950002013 modified "2023-10-04" @default.
• W2950002013 title "Formation of the Galactic bulge from a two-component stellar disc: explaining cylindrical rotation and a vertical metallicity gradient" @default.
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• W2950002013 doi "https://doi.org/10.1111/j.1745-3933.2011.01097.x" @default.
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