Fakultät für Physik und Astronomie
STEPHEN PHILLIPS hostreviews.co.uk / UNSPLASH

Modelling the Milky Way Disc and Gaia Data

Andreas Just , ARI

Many fundamental questions about the structure and evolution of the Milky Way’s thin disc are still under debate: What is its radial scale length? What is the star formation history in the solar neighbourhood? What is the reason for the dynamical heating (age-velocity dispersion relation) of the stellar sub-populations? Has the thin disc grown inside-out? Is radial mixing important to understand the dynamical and abundance properties of the disc stars? All these aspects are strongly correlated in any consistent physical model of the Milky Way. I will present the status of our analytic disc model and discuss the impact of the Gaia DR1 data on the local disc parameters. TGAS provides parallaxes and proper motions for more than a million stars in the solar neighbourhood. Combined with RAVE data, full 6-D param-eter space information is available for 250,000 stars allowing a stringent test of the local model. For the radial extension of the disc model additional large spectral surveys like APOGEE and GES are needed to infer the inside-out growth of the disc.

ARI Institute Colloquium
6 Jul 2017, 11:15
ARI Moenchhofstrasse 12-14, Seminarraum 1

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