English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Two main scenarios for the formation of the Galactic bulge are invoked, thefirst one through gravitational collapse or hierarchical merging of subclumps,the second through secular evolution of the Galactic disc. We aim to constrainthe formation of the Galactic bulge through studies of the correlation betweenkinematics and metallicities in Baade's Window (l=1, b=-4) and two other fieldsalong the bulge minor axis (l=0, b=-6 and b=-12). We combine the radialvelocity and the [Fe/H] measurements obtained with FLAMES/GIRAFFE at the VLTwith a spectral resolution of R=20000, plus for the Baade's Window field theOGLE-II proper motions, and compare these with published N-body simulations ofthe Galactic bulge. We confirm the presence of two distinct populations inBaade's Window found in Hill et al. 2010: the metal-rich population presentsbar-like kinematics while the metal-poor population shows kinematicscorresponding to an old spheroid or a thick disc one. In this context themetallicity gradient along the bulge minor axis observed by Zoccali et al.(2008), visible also in the kinematics, can be related to a varying mix ofthese two populations as one moves away from the Galactic plane, alleviatingthe apparent contradiction between the kinematic evidence of a bar and theexistence of a metallicity gradient. We show evidences that the two mainscenarios for the bulge formation co-exist within the Milky Way bulge.

Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity