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SUMMARY:Decoding Dark Matter with Stellar Streams from Beyond the Milky Wa
 y
DTSTART;VALUE=DATE-TIME:20230323T135500Z
DTEND;VALUE=DATE-TIME:20230323T142000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115754Z
UID:indico-contribution-181@meetings.aip.de
DESCRIPTION:Speakers: Sarah Pearson (NYU)\nIn the coming decade\, thousand
 s of stellar streams will be observed in the halos of external galaxies wi
 th the Nancy Grace Roman Space Telescope\, the Euclid Space Telescope\, an
 d the Vera C. Rubin Observatory. Stellar streams form when a dwarf galaxy 
 or a cluster of stars is torn apart due to an underlying galactic potentia
 l\, leaving behind a swath of thousands of stars that exhibit coherent\, o
 rdered motion. These streams are sensitive to the distribution of dark mat
 ter and to the population of dark matter subhalos in galaxies\, both of wh
 ich depend on the mass and interactions of the dark matter particle. In th
 is talk\, I discuss how to use the incoming wealth of stellar stream data 
 to rule out dark matter candidates. I first focus on dwarf streams and pre
 sent new models of the Centaurus A (Cen A) dwarf companion Dwarf 3 (Dw3) a
 nd Dw3's associated stellar stream. With a novel external galaxy stream-fi
 tting technique\, I show that there are many viable stream models that fit
  the data well\, provided that Cen A has a dark matter halo mass larger th
 an M_200 > 4.7 x 10^12 Msun. I also demonstrate that just one radial veloc
 ity measurement breaks degeneracies between stream morphology and dark mat
 ter halo mass. In the second part of the talk\, I discuss stellar streams 
 from globular clusters. Due to their low velocity dispersions\, these stre
 ams are sensitive to gravitational interactions with low-mass dark matter 
 subhalos. In the Milky Way\, we know of a handful of stellar streams with 
 noticeable under-densities\, however\, the Galactic bar\, molecular clouds
 \, and spiral arms can also lead to similar signatures in the streams. If 
 we can instead find globular cluster streams in external galaxies without 
 these baryonic perturbers\, gaps in such streams can be easier to decipher
  and serve as a test of LCDM. I present the Hough Stream Spotter code whic
 h can rapidly and systematically search for linear structures in external 
 galaxies. The Hough Stream Spotter combined with the Nancy Grace Roman Spa
 ce Telescope will find hundreds of thin globular cluster streams in extern
 al galaxies. Lastly\, I will discuss how to use stellar streams as tools t
 o rule out dark matter candidates that are inconsistent with the new wealt
 h of data.\n\nhttps://meetings.aip.de/event/20/contributions/181/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/181/
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