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SUMMARY:Leo T Dissected with the MUSE-Faint Survey
DTSTART;VALUE=DATE-TIME:20230322T091000Z
DTEND;VALUE=DATE-TIME:20230322T092500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092430Z
UID:indico-contribution-203@meetings.aip.de
DESCRIPTION:Speakers: Daniel Vaz (Instituto de Astrofísica e Ciências do
  Espaço)\nPrevious studies of Ultra-Faint Dwarfs (UFDs) show that their d
 ynamical mass-to–light ratios are the highest values measured in any typ
 e of galaxy\, implying relatively pure dark-matter halos with minimal bary
 onic content. Furthermore\, UFDs have the lowest metallicities\, oldest ag
 es\, smallest sizes\, and simplest assembly histories of all galaxies. Und
 erstanding the nature of these galaxies would improve immensely the knowle
 dge of the galaxy formation process and help to unravel the nature of dark
  matter.\n\nThe Leo T UFD is one of the lowest mass galaxies known to cont
 ain neutral gas and to be also extremely dark-matter dominated. Previous s
 tudies have shown signs of recent star formation in the galaxy\, making it
  one of the very faintest galaxies to show this. It is\, therefore\, an in
 teresting laboratory for studies of gas and star formation at the limit of
  where galaxies are found to have rejuvenating episodes of star formation.
 \n\nIn this contribution I will discuss a novel study of Leo T that we hav
 e done using data from the MUSE integral field spectrograph. The high sens
 itivity of MUSE allowed us to obtain velocity measurements for stars as fa
 int as magnitude ~24\, which allowed us to increase the number of Leo T st
 ars observed spectroscopically from 19 to 75.\nCombining the MUSE data wit
 h photometric data from HST\, we have studied the age and metallicity of t
 hese stars and identified two populations\, all consistent with similar me
 tallicity. Within the young population sample we discovered three emission
  line Be stars - a first for ultra-faint dwarfs.\nWhile looking for differ
 ences in the dynamics of young and old stars\, we find that they have diff
 erent kinematics\, with the young population having a velocity dispersion 
 consistent with the kinematics of the cold component of the neutral gas. \
 nIn this contribution I will discuss these results and their implications 
 for the origin and evolution of Leo T.\n\nhttps://iaus379.aip.de/event/20/
 contributions/203/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/203/
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