Revealing the spiral arms through radial migration and the shape of the Metallicity Distribution Function

Abstract

Recent observations show that the Milky Way's metallicity distribution function (MDF) changes its shape as a function of radius. This new evidence of radial migration within the stellar disc sets additional constraints on Galactic models. By performing controlled test particle simulations in a very detailed, observationally motivated model of the Milky Way, we demonstrate that, in the inner region of the disc, the MDF is shaped by the joint action of the bar and spiral arms, while at outer radii the MDF is mainly shaped by the spiral arms. We show that the spiral arms are able to imprint their signature in the radial migration, shaping the MDF in the outskirts of the Galactic disc with a minimal participation of the bar. Conversely, this work has the potential to characterise some structural and dynamical parameters of the spiral arms based on radial migration and the shape of the MDF. Finally, the resemblance obtained with this approximation to the MDF curves of the Galaxy as seen by APOGEE, show that a fundamental factor influencing their shape is the Galactic potential.

9 pages, 4 Figures, 1 Table. Accepted for publication in MNRAS

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• Arm-interarm gas abundance variations explored with MUSE: the role of spiral structure in the chemical enrichment of galaxies
• Migration and Mixing in the Galactic Disc from Encounters between Sagittarius and the Milky Way
• Dynamics and Morphology of the Milky Way Spiral Arms from the Metallicity Distribution and Radial Mixing
• The imprint of radial migration on the vertical structure of galaxy disks
• Evolution of the chemical enrichment and the Mass-Metallicity relation in CALIFA galaxies
• Chemodynamical signatures of bar resonances in the Galactic disk: current data and future prospects
• New insights in the origin and evolution of the old, metal-rich open cluster NGC 6791
• On the Survival of High-Altitude Open Clusters within the Milky Way Galaxy Tides
• Analytic solution of Chemical Evolution Models with Type Ia SNe
• Dynamics of thick, open spirals in Perlas potentials
• Probing the origins. I. Generalised Additive Model inference of birth radii for Milky Way stars in the solar vicinity