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

The Milky Way disk in the framework of a semi-analytic model: Gaia data, forward modelling approach, and perspectives

Kseniia Sysoliatina , ARI

We use highly precise astrometric parameters and photometry provided in Gaia DR1 and DR2, and also high-resolution spectroscopy from surveys such as RAVE and APOGEE, in order to derive new constraints on the Milky Way disk evolution as viewed in the frame- work of a semi-analytic chemo-dynamic model (JJ model) calibrated in the solar neighborhood. First, we discuss the possibility to extend the JJ model to Galactocentric distances beyond solar, R=[4,12] kpc, and compare the predicted trends in stellar distribution with the corresponding trends identified through observations or predicted by N-body simulations. Second, we test the model in the solar cylinder against the thin-disk sample selected from the Gaia DR1 and RAVE data. Based on the JJ model, we simulate this sample via the forward modelling technique. In particular, we convert the predicted vertical density laws of the thin-disk populations into a mock sample making use of a decreasing SFR and a three-slope broken power law IMF. The obtained mock populations are reddened with a 3D dust map and subjected to the selection criteria corresponding to the RAVE and Gaia DR1 observational limitations as well as to additional cuts applied to the data sample. We calculate the quantities of interest (star counts, Hess diagrams, velocity distribution functions) separately at different heights above the Galactic plane also accounting for the observational distance errors. We also check and confirm the consistency of our results with the newly available Gaia DR2. In the end, the future work in this direction will be discussed.

ARI Institute Colloquium
8 Nov 2018, 11:15
ARI Moenchhofstrasse 12-14, Seminarraum 1

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