# IAUS379: Dynamical Masses of Local Group Galaxies

20-24 March 2023
Haus H, Telegrafenberg
Europe/Berlin timezone

## The relation between stellar and dark matter haloes of Milky Way-mass galaxies

21 Mar 2023, 09:57
2m
Haus H, Telegrafenberg

#### Haus H, Telegrafenberg

Potsdam, Germany
Poster SESSION 2 : Sizes, Masses, and Formation histories of the Milky Way and of Andromeda

Anna Genina

### Description

In this talk, I will discuss the predictions of the $\Lambda$CDM model on the make-up of stellar and dark matter haloes of Milky Way-mass galaxies. I will show that the stellar haloes are made up largely of stars from massive mergers, like Gaia-Enceladus/Sausage in the Milky Way, while the same mergers also make up nearly half of the dark matter halo. Past mergers leave imprints in the phase-space structure of the stellar halo. In particular, the "edge" of the stellar halo is defined by the latest major merger and the location of the "edge" is indicative of the total mass and recent assembly history of the galaxy. I will also show that recently accreted massive satellites (analogous to the LMC) contribute nearly a quarter of the total dark matter mass of Milky Way-mass galaxies despite not being fully disrupted yet.

Do you plan to attend the symposium in-person or virtually? in-person

### Presentation Materials

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