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Streams and the Milky Way dark matter halo

Published online by Cambridge University Press:  14 May 2020

Heidi Jo Newberg
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Siddhartha Shelton
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Eric Mendelsohn
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Jake Weiss
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Matthew Arsenault
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Jacob S. Bauer
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu Department of Physics, Engineering Physics & Astronomy, Queen’s University, Kingston, ON, K7L 3N6, Canada
Travis Desell
Affiliation:
Department of Software Engineering, Rochester Institute of Technology, 134 Lomb Memorial Drive, Rochester, NY14623, USA
Roland Judd
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Malik Magdon-Ismail
Affiliation:
Department of Computer Science, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA
Matthew Newby
Affiliation:
Department of Physics, Temple University, 1925 N. 12th Street, Philadelphia, PA19122, USA
Clayton Rayment
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Colin Rice
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Boleslaw K. Szymanski
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu Department of Computer Science, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA
Jeffery M. Thompson
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Steve Ulin
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
Carlos Varela
Affiliation:
Department of Computer Science, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA
Lawrence M. Widrow
Affiliation:
Department of Physics, Engineering Physics & Astronomy, Queen’s University, Kingston, ON, K7L 3N6, Canada
Benjamin A. Willett
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY12180, USA email: newbeh@rpi.eu
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Abstract

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We describe an algorithm that can fit the properties of the dwarf galaxy progenitor of a tidal stream, given the properties of that stream. We show that under ideal conditions (the Milky Way potential, the orbit of the dwarf galaxy progenitor, and the functional form of the dwarf galaxy progenitor are known exactly), the density and angular width of stars along the stream can be used to constrain the mass and radial profile of both the stellar and dark matter components of the progenitor dwarf galaxy that was ripped apart to create the stream. Our provisional fit for the parameters of the dwarf galaxy progenitor of the Orphan Stream indicates that it is less massive and has fewer stars than previous works have indicated.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

References

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