Events · Colloquium

CASSA Colloquium 13: Modelling the Last Major Merger that Shaped the Milky Way

Name: CASSA Colloquium 13: Modelling the Last Major Merger that Shaped the Milky Way
Start: 2026-01-27T08:30:00.000Z
End: 2026-01-27T10:00:00.000Z
Location: CASSA, IUB Main Building Rooftop, Plot 16, Aftabuddin Ahmed Road, Block B, Bashundhara RA (Main Building Rooftop)

Speaker (in person): Istiak Akib, PhD candidate, Laboratoire d’Instrumentation et de Recherche en Astrophysique (LIRA), Observatoire de Paris, Paris…

When

Tuesday, 27 January 2026

2:30 pm – 4:00 pm

Where

CASSA, IUB Main Building Rooftop, Plot 16, Aftabuddin Ahmed Road, Block B, Bashundhara RA (Main Building Rooftop)

Organizer

CASSA, Independent University, Bangladesh

Type

Colloquium

Speaker (in person): Istiak Akib, PhD candidate, Laboratoire d’Instrumentation et de Recherche en Astrophysique (LIRA), Observatoire de Paris, Paris Sciences et Lettres University (PSL), France.

Abstract

The last major merger of the Milky Way (MW) occurred 9-10 Gyr ago with an incoming galaxy known as the Gaia-Sausage Enceladus (GSE). We present the first hydrodynamical modelling of this collision using GIZMO. Our simulation reproduces the observed kinematic signatures of GSE. Furthermore, the merger model successfully recovers key structural and dynamical properties of the present-day MW, such as, the bulge, disk, bar and its rotation, four spiral arms, surface mass density, rotation curve, gas fraction, and star formation history. The simulations also show evidence for the Galactic warp and flare.

← All events