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• W3103604486 abstract "<i>Context. <i/>Two main scenarios for the formation of the Galactic bulge are invoked, the first one through gravitational collapse or hierarchical merging of subclumps, the second through secular evolution of the Galactic disc.<i>Aims. <i/>We aim to constrain the formation of the Galactic bulge through studies of the correlation between kinematics and metallicities in Baade's Window (<i>l<i/> = 1°, <i>b<i/> = -4°) and two other fields along the bulge minor axis (<i>l<i/> = 0°, <i>b<i/> = -6° and <i>b<i/> = -12°).<i>Methods. <i/>We combine the radial velocity and the [Fe/H] measurements obtained with FLAMES/GIRAFFE at the VLT with a spectral resolution of <i>R<i/> = 20 000, plus for the Baade's Window field the OGLE-II proper motions, and compare these with published <i>N<i/>-body simulations of the Galactic bulge.<i>Results. <i/>We confirm the presence of two distinct populations in Baade's Window found in Hill et al. (2010, A&A, submitted): the metal-rich population presents bar-like kinematics while the metal-poor population shows kinematics corresponding to an old spheroid or a thick disc. In this context the metallicity gradient along the bulge minor axis observed by Zoccali et al. (2008, A&A, 486, 177), visible also in the kinematics, can be related to a varying mix of these two populations as one moves away from the Galactic plane, alleviating the apparent contradiction between the kinematic evidence of a bar and the existence of a metallicity gradient.<i>Conclusions. <i/>We show evidence that the two main scenarios for the bulge formation co-exist within the Milky Way bulge." @default.
• W3103604486 created "2020-11-23" @default.
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• W3103604486 date "2010-09-01" @default.
• W3103604486 modified "2023-10-14" @default.
• W3103604486 title "Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity" @default.
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• W3103604486 doi "https://doi.org/10.1051/0004-6361/201014353" @default.
• W3103604486 hasPublicationYear "2010" @default.
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