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1 results

  • First Results from the Triangulum Extended Survey: Insights into the Dynamical History of M33

  • K. M. Gilbert, A. C. N. Quirk, L. R. Cullinane, A. Smercina, P. Guhathakurta
  • Journal:
    Proceedings of the International Astronomical Union / Volume 19 / Issue S379 / December 2023
    Published online by Cambridge University Press:
    30 October 2025, pp. 123-128
    Print publication:
    December 2023
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  • The Triangulum Extended (TREX) Survey is a spectroscopic survey† that targets resolved stars of all ages throughout the disk of Triangulum (M33). We summarize the first results from the TREX Survey, including the discovery of a kinematically hot, halo-like population throughout M33’s inner disk in both the old and intermediate-age populations and evidence that the youngest stars have been dynamically heated. We also discuss the implications for our understanding of M33’s dynamical history in the context of recent results from the Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) Survey.