Ghostly Tributaries to the Milky Way: Charting the Halo's Stellar Streams with the Gaia DR2 catalogue

Abstract

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 $|b|>30°$, 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.

14 pages, 10 Figures, 1 Table. Accepted for publication by MNRAS

References in corpus (24)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Gaia Data Release 2: The astrometric solution
• Gaia Data Release 2: Photometric content and validation
• Gaia Data Release 2: using Gaia parallaxes
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• Detection of a 63 Degree Cold Stellar Stream in the Sloan Digital Sky Survey
• Stellar Streams Discovered in the Dark Energy Survey
• Detection of a 60 Degree-Long Dwarf Galaxy Debris Stream
• Globular Cluster Streams as Galactic High-Precision Scales - The Poster Child Palomar 5
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• ZFOURGE/CANDELS: On the Evolution of M* Galaxy Progenitors from z=3 to 0.5
• STREAMFINDER I: A New Algorithm for detecting Stellar Streams
• A New Catalog of Globular Clusters in the Milky Way
• The information content in cold stellar streams
• Fourteen candidate RR Lyrae star streams in the inner Galaxy
• Revised Geometric Estimates of the North Galactic Pole and the Sun's Height Above the Galactic Midplane
• Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey
• Evidence for the formation of the young counter-rotating stellar disk from gas acquired by IC 719
• Migration of planets in circumbinary discs
• A deeper look at the GD1 stream: density variations and wiggles
• Periodic Variations in the O-C Diagrams of Five Pulsation Frequencies of the DB White Dwarf EC 20058-5234
• Forming Different Planetary Architectures . I . Formation Efficiency of Hot Jupites from High-eccentricity Mechanisms
• Discovery of a Very Large (~20 kpc) Galaxy at z=3.72
• Measuring the Sun's Motion with Stellar Streams

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