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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230606T123000
DTEND;TZID=Atlantic/Canary:20230606T133000
UID:iactalks-1688
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1688
CREATED:2023-06-06T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Ultra-Diffuse Galaxies (UDGs) and the Stellar Mass – Halo Mass Re
 lationship 
DESCRIPTION:Ultra-Diffuse Galaxies (UDGs) and the Stellar Mass – Halo Mas
 s Relationship \nDr. Jonah Gannon\n\nThe stellar mass – halo mass re
 lationship is a fundamental scaling relationship connecting galaxies from 
 dwarfs to giants to their dark matter halos. This relationship is currentl
 y key to our understanding of the complex interplay between the many modes
  of feedback (e.g., stellar winds, supernovae, AGN) and star formation in 
 galaxies. However, recently a population of large half-light radius, low s
 urface brightness ultra-diffuse galaxies (UDGs) have questioned our unders
 tanding of galaxy formation in the dwarf galaxy regime. UDGs have been fou
 nd to reside in dark matter halos of widely varying mass. While many likel
 y reside in "normal" dark matter halos for their stellar mass, some may ex
 hibit an extreme lack of dark matter while yet others are extremely dark m
 atter rich. In this talk, I give an overview of the current observational 
 evidence for UDGs residing in massive dark matter halos. I place particula
 r emphasis on my own Keck observations which have provided support for UDG
 s' unexpected stellar mass – halo mass positioning and that has reve
 aled the internal structure of their halo (i.e., core vs cusp nature). I d
 iscuss how these observations currently inform proposed formation scenario
 s for UDGs and show an outstanding tension of my observations with simulat
 ions of galaxy formation. I conclude with a brief discussion of the import
 ant future goals of the field.
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