1 research outputs found
Proper Motions of Stellar Streams Discovered in the Dark Energy Survey
We cross-match high-precision astrometric data from Gaia DR2 with accurate multi-band photometry
from the Dark Energy Survey (DES) DR1 to confidently measure proper motions for nine stellar
streams in the DES footprint: Aliqa Uma, ATLAS, Chenab, Elqui, Indus, Jhelum, Phoenix, Tucana
III, and Turranburra. We determine low-confidence proper motion measurements for four additional
stellar streams: Ravi, Wambelong, Willka Yaku, and Turbio. We find evidence for a misalignment
between stream tracks and the systemic proper motion of streams that may suggest a systematic
gravitational in
uence from the Large Magellanic Cloud. These proper motions, when combined with
radial velocity measurements, will allow for detailed orbit modeling which can be used to constrain
properties of the LMC and its on nearby streams, as well as global properties of the Milky Way's
gravitational potential