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SUMMARY:Dark matter content and dynamical masses of ultra-diffuse galaxies
  in the Coma cluster
DTSTART;VALUE=DATE-TIME:20230323T134000Z
DTEND;VALUE=DATE-TIME:20230323T135500Z
DTSTAMP;VALUE=DATE-TIME:20241114T092450Z
UID:indico-contribution-217@meetings.aip.de
DESCRIPTION:Speakers: Igor Chilingarian (Center for Astrophysics - Harvard
  and Smithsonian)\nUltra-diffuse galaxies (UDGs) are spatially extended\, 
 low surface brightness stellar systems with regular elliptical-like morpho
 logy found in a wide range of environments. Studies of the internal dynami
 cs and dark matter content of UDGs that would elucidate their formation an
 d evolution have been hampered by their low surface brightnesses. We ident
 ified a sample of low-mass early-type post-starburst galaxies in the Coma 
 cluster still populated with young stars\, which will passively evolve int
 o UDGs in the next 5-10 Gyr. We collected deep observations for a large sa
 mple of low-mass galaxies in the Coma cluster using MMT Binospec. Here\, w
 e present spatially resolved velocity profiles out to 1 half-light radius\
 , stellar velocity dispersions\, ages\, and metallicities for dozens of ol
 d UDGs in the Coma cluster and the same quantities derived out to 2-3 half
 -light radii for young dwarf post-starburst galaxies\, the future UDGs. We
  derived their dynamical masses and dark matter content using Jeans modell
 ing. High dark matter fractions\, low degrees of rotational support\, mode
 rately low metallicities place UDGs onto the extension of the dwarf ellipt
 ical galaxy locus in several galaxy scaling relations such as the Fundamen
 tal Plane\, the baryonic Tully-Fisher and the mass-metallicity relation. W
 e demonstrate that statistically at least a half of present-day `old' UDGs
  were formed by ram-pressure stripping of disky progenitors. We discuss wh
 ether the same evolutionary scenario is applicable to the entire UDG popul
 ation.\n\nhttps://iaus379.aip.de/event/20/contributions/217/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/217/
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