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SUMMARY:The OC stream's evolution in the dark matter haloes of the Milky W
 ay and the LMC
DTSTART;VALUE=DATE-TIME:20230323T080000Z
DTEND;VALUE=DATE-TIME:20230323T082500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115748Z
UID:indico-contribution-178@meetings.aip.de
DESCRIPTION:Speakers: Denis Erkal (University of Surrey)\nThe OC stream is
  a dwarf galaxy stream and is one of the longest and best-measured streams
  in the Galaxy\, spanning over 200 degrees on the sky. It extends from the
  inner Milky Way ($\\sim$15 kpc) to the outer halo ($\\sim$60 kpc)\, givin
 g us a great tool with which to measure our Galaxy's dark matter halo. In 
 addition\, portions of the stream pass remarkably close to the LMC ($\\sim
 $5 kpc)\, allowing us to simultaneously measure the properties of our Gala
 xy and the LMC. By combining data from Gaia DR3 with the S5 survey\, LAMOS
 T\, SDSS\, and APOGEE\, I will present a 6D view of the stream. In light o
 f this powerful data\, we fit the OC stream using a flexible model of the 
 Milky Way halo and the LMC. In particular\, we measure the Milky Way's mas
 s to a precision of 4% in the middle of the stream's radial extent\, $\\si
 m$2.85$\\times10^{11}M_\\odot$ at $\\sim$32.4 kpc. We also infer a highly 
 flattened dark matter halo of the Milky Way\, with the data preferring an 
 oblate (q = $\\sim$0.55) and prolate (q = $\\sim$1.40) halo over a spheric
 al one. Interestingly\, we find that both of these haloes are producing a 
 similar forcefield in the orbital plane of the OC stream\, suggesting they
  may be attempting to mimic a forcefield which cannot be described with by
  a flattened halo. We also measure the LMC's dark matter halo. In particul
 ar\, we find the LMC has a mass of $\\sim1.3\\times10^{11} M_\\odot$\, whi
 ch is one-sixth the Milky Way's virial mass. Our fits also suggest that th
 e LMC's dark matter halo must extend out to at least $\\sim$53 kpc from th
 e LMC\, consistent with the LMC being on first approach to the Milky Way. 
 Finally\, we find that the OC stream's close passage with the LMC occurs $
 \\sim$300 Myr ago. Since the OC stream is very sensitive to the LMC's loca
 tion at this time\, this allows us to better constrain the LMC's past orbi
 t up to that time. For the first time\, we constrain the amount of dynamic
 al friction the LMC has experienced and find that it is consistent with wh
 at is expected given the LMC's substantial dark matter halo. I will end wi
 th the future directions of this work and how these results can be used to
  constrain alternative gravity and alternative dark matter models.\n\nhttp
 s://meetings.aip.de/event/20/contributions/178/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/20/contributions/178/
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