Ghostly Tributaries to the Milky Way: Charting the Halo's Stellar
  Streams with the Gaia DR2 catalogue
  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 $|b|>30\deg$, 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, 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.
