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SUMMARY:The Power of Milky Way's Stellar Streams with Full 6D+ Phase Space
  Data Set from S5 and DESI
DTSTART;VALUE=DATE-TIME:20230320T085500Z
DTEND;VALUE=DATE-TIME:20230320T092000Z
DTSTAMP;VALUE=DATE-TIME:20241114T092405Z
UID:indico-contribution-170@meetings.aip.de
DESCRIPTION:Speakers: Ting Li ()\nStellar streams are one of the most powe
 rful tracers to determine the mass of the Milky Way and other nearby galax
 ies. Full 6D phase space data is necessary for us to get there. In this ta
 lk\, I will discuss two ongoing spectroscopic programs to study the stella
 r streams in our Milky Way and highlight a few latest scientific results f
 rom these two programs. The Southern Stellar Stream Spectroscopic Survey (
 S5)\, started in 2018\, is the first systematic program pursuing a complet
 e census of known streams in the Southern Hemisphere using the fiber-fed A
 AOmega spectrograph on the Anglo-Australian Telescope. The science results
  from S5 include a homogeneous study of the kinematic and chemical propert
 ies of dozen streams in our Milky Way\, the finding of a stream at ~30 kpc
  possibly perturbed by the dark matter subhalo\, the constraints on the ma
 ss of the Milky Way and the Large Magellanic Cloud with stellar streams\, 
 and the discovery of the fastest hyper velocity stars ejected from Galacti
 c center that can be used to study the shape of the Milky Way halo. The Mi
 lky Way Survey of the Dark Energy Spectroscopic Instrument (DESI)\, on the
  other hand\, is a recently started 5-yr spectroscopic program in the Nort
 hern Hemisphere. DESI deploys 5000 fibers over a 3.2 deg diameter field of
  view at the prime focus of the Mayall 4-meter telescope at the Kitt Peak 
 National Observatory\, with a spectral resolution of R~2500-5000 and a wav
 elength coverage of 3600-9824 Angstrom. With just the first year of data c
 ollected in 2021-2022\, 3.6 million unique stars have been observed\, incl
 uding many stars in the streams of the northern sky (e.g. GD-1) and showin
 g some interesting features. We are entering an extremely data-rich era in
  the next decade\, with full 6D+chemistry information on dozens of stellar
  streams\, to shape our understanding on the chemo-dynamical evolution of 
 the Milky Way\, as well as the nature of the dark matter.\n\nhttps://iaus3
 79.aip.de/event/20/contributions/170/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/170/
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