Andromeda and its satellites - a kinematic perspective

TL;DR

This paper compares the kinematic properties of Andromeda and its satellites with the Milky Way, highlighting differences in dwarf galaxy characteristics and analyzing the newly discovered thick disc of M31.

Contribution

It provides new spectroscopic data and analysis of Andromeda's disc and satellite systems, revealing discrepancies and features not previously characterized.

Findings

Andromeda's dwarf spheroidals differ in mass and scale radius from Milky Way counterparts.

The M31 thick disc is hotter, more extended, and thicker than the Milky Way's.

Spectroscopic data enhances understanding of galaxy formation and satellite dynamics.

Abstract

Using spectroscopic data taken with Keck II DEIMOS by the Z-PAndAS team in the Andromeda-Triangulum region, I present a comparison of the disc and satellite systems of Andromeda with those of our own Galaxy. I discuss the observed discrepancies between the masses and scale radii of Andromeda dwarf spheroidal galaxies of a given luminosity with those of the Milky Way. I also also present an analysis of the newly discovered M31 thick disc, which is measured to be hotter, more extended and thicker than that seen in the Milky Way.