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SUMMARY:The Triangulum Extended Survey: Insights into the Dynamical Histor
 y of M33 and M31
DTSTART;VALUE=DATE-TIME:20230321T133000Z
DTEND;VALUE=DATE-TIME:20230321T134500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092424Z
UID:indico-contribution-191@meetings.aip.de
DESCRIPTION:Speakers: Karoline Gilbert (Space Telescope Science Institute)
 \nTriangulum (M33)\, a satellite of the Andromeda (M31) galaxy\, is the on
 ly dwarf Spiral in the Local Group.  With a mass ten times lower than M31
 ’s and a star formation rate 10 times higher\, M33 is the best local ana
 log for high z galaxies. The Triangulum Extended Survey (TREX) is a large 
 resolved stellar spectroscopic survey of M33 and its extended structures. 
  With contiguous spectroscopic fields covering M33's inner disk\, out to M
 33's disk break\, and beyond\, we are investigating the evidence for both 
 internal and external heating mechanisms affecting M33.  Using a sample of
  over 4500 M33 stars with line of sight velocity measurements\, spanning f
 rom young\, massive main sequence stars to old red giant branch stars\, we
  established that a significant high-velocity-dispersion component is pres
 ent in M33's RGB population from near M33's center to at least the radius 
 where M33's H I disk begins to warp at 30' (~7.5 kpc) in the plane of the 
 disk. This is the first detection and spatial characterization of a kinema
 tically hot stellar component throughout M33's inner regions.  However\, b
 eyond the break in M33's disk\, we find the stellar population is dominate
 d by stars with disk-like kinematics\, with only marginal evidence for a k
 inematically hot halo component\, casting doubt onto whether this componen
 t is likely to have been formed from accretion of smaller systems.   We ha
 ve also measured the velocity dispersion and asymmetric drift of stars in 
 the disk as a function of stellar age\, finding neither increases with ste
 llar age and the youngest disk stars are dynamically hotter than predicted
  by simulated M33 analogs in Illustris. This indicates an additional\, cur
 rently unknown source of dynamical heating of the young stars in the disk 
 of M33.  I will discuss these TREX results\, as well as future prospects\,
  in the context of our understanding of the  orbital history of M33\, in p
 articular\, the question of whether M33 is on first infall or has interact
 ed substantially with M31 in the past.\n\nhttps://iaus379.aip.de/event/20/
 contributions/191/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/191/
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