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SUMMARY:An aMUSEing view of the dwarf irregular galaxy IC 1613
DTSTART;VALUE=DATE-TIME:20230322T082500Z
DTEND;VALUE=DATE-TIME:20230322T084000Z
DTSTAMP;VALUE=DATE-TIME:20241114T092427Z
UID:indico-contribution-199@meetings.aip.de
DESCRIPTION:Speakers: Salvatore Taibi (Leibniz-Institute for Astrophysics 
 Potsdam)\nAnalysing the stellar kinematic properties of a dwarf galaxy mak
 es it possible to investigate which internal mechanisms have shaped its ev
 olution. Isolated dwarf galaxies with an extended star formation history\,
  in particular\, offer the opportunity to study not only star formation pr
 ocesses at low-mass and low-metallicity scales\, but also to understand ho
 w internal kinematic properties evolve thanks to the possibility of a comb
 ined comparison of gas kinematics with that of young and old stars. \n\nIn
  this context\, we have analysed a new spectroscopic dataset of the isolat
 ed gas-rich dwarf galaxy IC 1613 taken with the integral-field-unit MUSE i
 nstrument mounted on the Very Large Telescope (VLT)\, capable of combining
  high spatial resolution to a wide spectral coverage (4750 − 9300 AA) wi
 th a resolving power of R = 1500 − 3000. Thanks to this revolutionary in
 strument\, we obtained a large dataset of ~2000 sources extracted from 3 p
 ointings\, of which we could reliably perform spectral classification and 
 radial velocity determination for more than 800 stars. We were also able t
 o obtain metallicities from Ca II triplet lines for a selected subsample o
 f ~300 red giant branch stars. This dataset is the largest currently colle
 cted for an isolated dwarf galaxy in the Local Group. \n\nFrom the spectra
 l classification we found giant stars of all stellar types\, with a large 
 predominance of red giant branch stars\, as to be expected. We were also a
 ble to identify a sample of C-star candidates\, useful for determining the
  spectroscopic C/M ratio\, and hot emission line stars as an additional ki
 nematic tracer for young stars.\nThe preliminary kinematic analysis has le
 d to a systemic velocity and a velocity dispersion both in agreement with 
 previous literature values. We also found with high statistical significan
 ce a linear rotation signal along the optical major axis of the galaxy\, w
 hich is a novelty. Stars follow the velocity field of the neutral HI compo
 nent\, although they start to decouple from the gas motion around the half
 -light radius. When subdivided according to age\, young and old stars seem
  to follow similar kinematic trends\, although the statistics for young st
 ars drop dramatically in the outermost pointings. \nFinally\, chemical ana
 lysis resulted in an average [Fe/H] that was slightly higher than literatu
 re values\, but within the rms dispersion of the stellar luminosity-metall
 icity relation. We found no evidence of a radial metallicity gradient\, co
 mpatible with results from other similarly luminous dwarf galaxies.\n\nReg
 ardless of results actually obtained\, we want to show the vast research p
 ossibilities that MUSE offers in the field of resolved stellar populations
  in nearby dwarf galaxies\, whose surface we have only scratched.\n\nhttps
 ://iaus379.aip.de/event/20/contributions/199/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/199/
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