Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 481, Issue 3, Pages 3442-3455Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2474
Keywords
stars: kinematics and dynamics; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure
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Funding
- DPAC
- CEA
- CNES
- National Science Foundation [NSF PHY11-25915]
- Programme National Cosmology et Galaxies (PNCG) of CNRS/INSU
- INP
- IN2P3
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We present a panoramic map of the stellar streams of the Milky Way based upon astrometric and photometric measurements from the Gaia DR2 catalogue. In this first contribution, we concentrate on the halo at heliocentric distances beyond 5 kpc, and at Galactic latitudes vertical bar b vertical bar > 30 degrees, using the STREAMFINDER algorithm to detect structures along plausible orbits that are consistent with the Gaia proper motion measurements. We find a rich network of criss-crossing streams in the halo. Some of these structures were previously known, while several are new discoveries, but others are potentially artefacts of the Gaia scanning law and will require confirmation. With these initial discoveries, we are starting to unravel the complex formation of the halo of our Galaxy.
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