TREX: Kinematic Characterisation of a High-Dispersion Intermediate-Age Stellar Component in M33

TL;DR

This study characterizes the kinematic properties of the stellar halo in M33, revealing a distinct intermediate-age halo component that suggests a combination of in-situ formation and tidal interactions.

Contribution

It provides the first detailed kinematic analysis of an intermediate-age stellar halo in M33, highlighting its distinct properties and potential formation mechanisms.

Findings

Detection of a high-dispersion, non-rotating halo component.

Identification of a ~10% intermediate-age halo population.

Evidence of velocity offset indicating complex formation history.

Abstract

The dwarf galaxy Triangulum (M33) presents an interesting testbed for studying stellar halo formation: it is sufficiently massive so as to have likely accreted smaller satellites, but also lies within the regime where feedback and other "in-situ" formation mechanisms are expected to play a role. In this work, we analyse the line-of-sight kinematics of stars across M33 from the TREX survey with a view to understanding the origin of its halo. We split our sample into two broad populations of varying age, comprising 2032 "old" red giant branch (RGB) stars, and 671 "intermediate-age" asymptotic giant branch (AGB) and carbon stars. We find decisive evidence for two distinct kinematic components in both old and intermediate-age populations: a low-dispersion (~22 km/s) disk-like component co-rotating with M33's HI gas, and a significantly higher-dispersion component (~50-60 km/s) which does not rotate in the same plane as the gas and is thus interpreted as M33's stellar halo. While kinematically similar, the fraction of stars associated with the halo component differs significantly between the two populations: this is consistently ~10% for the intermediate age population, but decreases from ~34% to ~10% as a function of radius for the old population. We additionally find evidence that the intermediate-age halo population is systematically offset from the systemic velocity of M33 by ~25 km/s, with a preferred central LOS velocity of ~-155 km/s. This is the first detection and characterisation of an intermediate-age halo in M33, and suggests in-situ formation mechanisms, as well as potentially tidal interactions, have helped shaped it.