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SUMMARY: Streams: A New Frontier in Constraining Dark Matter Halo Populati
 ons - David Chemaly / IoA
DTSTART:20250618T121500Z
DTEND:20250618T124000Z
UID:TALK233491@talks.cam.ac.uk
CONTACT:128254
DESCRIPTION:Tidal streams—remnants of disrupted stellar systems—are po
 werful tracers of galactic gravitational potentials. While streams in the 
 Milky Way have yielded insights into its dark matter halo thanks to full 6
 D stellar data\, applying this method to external galaxies is more difficu
 lt due to the lack of kinematics and projection effects. Individually\, ph
 otometric-only streams offer limited constraints\, but their collective si
 gnal can be statistically powerful.\n\nIn this talk\, we present a novel h
 ierarchical Bayesian framework that uses purely photometric data to constr
 ain the population-level properties of dark matter halos. To achieve this\
 , we constructed STRRINGS\, a catalog of long and curved streams around ne
 arby galaxies. Our results show that even without kinematic information\, 
 an ensemble of just 50 well-characterized streams can reliably distinguish
  between oblate\, spherical\, and prolate halos. This highlights that even
  purely photometric datasets\, when analyzed in aggregate\, can yield robu
 st insights into dark matter distributions. \n\nThis breakthrough arrives 
 at a critical moment\, as upcoming surveys from Euclid and LSST are set to
  deliver an unprecedented volume of high-quality stream observations. Our 
 approach represents a paradigm shift in how we constrain dark matter prope
 rties\, ultimately refining our understanding of the universe’s fundamen
 tal structure.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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