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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220524T123000
DTEND;TZID=Atlantic/Canary:20220524T133000
UID:iactalks-1567
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1567
CREATED:2022-05-24T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Globular clusters as a dynamical probe of dark matter
DESCRIPTION:Globular clusters as a dynamical probe of dark matter\nProf. Kf
 ir Blum\n\nGravitational dynamical friction affecting the orbits of globul
 ar clusters (GCs) was studied extensively as a possible formation mechanis
 m for nuclear star clusters in galaxies. In well-known examples that showc
 ase this phenomenon, like the Milky Way and M31 galaxies, the medium which
  affects the dynamical friction is dominated by bulge stars. In comparison
 , the case for dynamical friction in dark matter-dominated systems is much
  less clear. A puzzling example is the Fornax dwarf galaxy, where the obse
 rved positions of GCs have long been suspected to pose a challenge for dar
 k matter, dynamical friction theory, or both. We search for additional sys
 tems that are dark matter-dominated and contain a rich population of GCs, 
 offering a test of the mechanism. A possible example is the ultra diffuse 
 galaxy NGC5846-UDG1: we show that GC photometry in this galaxy provide evi
 dence for the imprint of dynamical friction, visible via mass segregation.
  If confirmed by future analyses of more GC-rich UDG systems, these observ
 ations could provide a novel perspective on the nature of dark matter.
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