The Milky Way is not an island: The halo of the Galaxy and its satellites

LOCATION: Sport & Kurhotel at Bad Moos - Via Val Fiscalina 27, 39030, Sexten

DETAILS

Image: Anne Dirkse, CC BY-SA 4.0, via Wikimedia Commons

Please contact the organisers (gabriele.cescutti@inaf.it)

Our Galaxy is not an isolated spiral galaxy in our Universe. We have known for a long time that it has satellite galaxies, such as the Magellanic clouds and the classical dwarf spheroidal galaxies. More recently, more and more objects have been discovered around the Milky way, from the elusive ultra faint galaxies, with the r-process rich Reticulum II, to the stellar streams. Nowadays, we know that the Galaxy has also cannibalized a number of dwarf galaxies in its past. For example, 8-10 billion years ago, a dwarf galaxy called Gaia-Enceladus Sausage was absorbed by the Milky Way and we discovered it thanks to Gaia data because of the eccentric orbits and range of energies its stars possess.

In this Conference, we will discuss chemical abundances from spectroscopy surveys as well as dynamical signatures from Gaia DR3 for the most ancient and metal-poor of our Galaxy as well as for its satellites. We will consider both stars born in situ and accreted, investigating their relative fractions and their different chemical enrichment histories. Theoretical models of the Galaxy formation and chemical evolution will be also discussed and their predictions for the key observables will be presented.

The main topics of the conference are:
– The halo of the Galaxy and its satellites
– Stellar streams and Ultra faint dwarf galaxies
– Accreted satellite and their dynamics
–Stellar spectroscopy and large surveys
–Stellar evolution model and stellar nucleosynthesis
–Chemical evolution models

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ORGANIZERS

Francesca Matteucci – Gabriele Cescutti – Emanuele Spitoni