Identifying Stellar Streams in Gaia DR2 with Data Mining Techniques

Abstract

Streams of stars from captured dwarf galaxies and dissolved globular clusters are identifiable through the similarity of their orbital parameters, a fact that remains true long after the streams have dispersed spatially. We calculate the integrals of motion for 44855 stars, to a distance of 4 kpc from the Sun, which have full and accurate 6D phase space positions in the Gaia DR2 catalogue. We then apply a novel combination of data mining, numerical and statistical techniques to search for stellar streams. This process returns seven high-confidence streams (including four that were not previously known), all of which display tight clustering in the integral of motion space. Colour-magnitude diagrams indicate that these streams are relatively simple, old, metal-poor populations. A combined evaluation of the kinematics and colour-magnitude properties suggests that the previously undiscovered streams are fragments of the Gaia-Enceladus progenitor. The success of this project demonstrates the usefulness of data mining techniques in exploring large datasets.

References in corpus (59)

• Scikit-learn: Machine Learning in Python
• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• The Structure of Cold Dark Matter Halos
• Local Kinematics and the Local Standard of Rest
• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• The Dartmouth Stellar Evolution Database
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• galpy: A Python Library for Galactic Dynamics
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• The mass distribution and gravitational potential of the Milky Way
• Tracing Galaxy Formation with Stellar Halos I: Methods
• The Field of Streams: Sagittarius and its Siblings
• The First Data Release (DR1) of the LAMOST general survey
• Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way
• A giant stream of metal-rich stars in the halo of the galaxy M31
• Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
• The Sagittarius Dwarf Galaxy: a Model for Evolution in a Triaxial Milky Way Halo
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• Estimating distances from parallaxes
• Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
• Constraining the Milky Way potential with a 6-D phase-space map of the GD-1 stellar stream
• The GALAH Survey: Second Data Release
• A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: IV. Modeling the Sagittarius Tidal Tails
• Detection of a 63 Degree Cold Stellar Stream in the Sloan Digital Sky Survey
• Galaxia: a code to generate a synthetic survey of the Milky Way
• Fossil Signatures of Ancient Accretion Events in the Halo
• Stellar Streams Discovered in the Dark Energy Survey
• Globular Clusters with Tidal Tails: Deep Two-Color Star Counts
• Gaia reveals a metal-rich in-situ component of the local stellar halo
• Ghostly Tributaries to the Milky Way: Charting the Halo's Stellar Streams with the Gaia DR2 catalogue
• One large blob and many streams frosting the nearby stellar halo in Gaia DR2
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• Confirmation of the $Gaia$ DR2 parallax zero-point offset using asteroseismology and spectroscopy in the $Kepler$ field
• The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
• Simultaneous calibration of spectro-photometric distances and the Gaia DR2 parallax zero-point offset with deep learning
• Discovery of a New, Polar-Orbiting Debris Stream in the Milky Way Stellar Halo
• Characterization and history of the Helmi streams with Gaia DR2
• Constraining the Milky Way Halo Potential with the GD-1 stellar stream
• Off the beaten path: Gaia reveals GD-1 stars outside of the main stream
• STREAMFINDER I: A New Algorithm for detecting Stellar Streams
• A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE
• Halo Substructure in the SDSS-Gaia Catalogue : Streams and Clumps
• The devil is in the tails: the role of globular cluster mass evolution on stream properties
• Dipping Our Toes in the Water: First Models of GD-1 as a Stream
• Halo streams in the 7th SDSS data release
• The RAVE-on catalog of stellar atmospheric parameters and chemical abundances for chemo-dynamic studies in the Gaia era
• The Dawning of the Stream of Aquarius in RAVE
• Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey
• Stellar halo streams in the Solar neighbourhood
• Tidal tails around the outer halo globular clusters Eridanus and Palomar 15
• Phlegethon, a nearby $75°$-long retrograde stellar stream
• The tidal tails of NGC 2298
• STREAMFINDER II: A possible fanning structure parallel to the GD-1 stream in Pan-STARRS1
• Chemo-Dynamical Clustering applied to APOGEE data: Re-Discovering Globular Clusters
• Dating the tidal disruption of globular clusters with Gaia data on their stellar streams
• Detecting Halo Streams with GAIA

Cited by in corpus (28)

• Streams, substructures and the early history of the Milky Way
• Dark matter local density determination: recent observations and future prospects
• Reconstructing the Disrupted Dwarf Galaxy $Gaia$-Sausage/Enceladus Using its Stars and Globular Clusters
• Galactic Archaeology with Gaia
• The GALAH survey: A census of lithium-rich giant stars
• Via Machinae: Searching for Stellar Streams using Unsupervised Machine Learning
• Substructure in the stellar halo near the Sun. I. Data-driven clustering in Integrals of Motion space
• Dynamically Tagged Groups of Metal-Poor Stars from the Best \& Brightest Survey
• Chasing Accreted Structures within Gaia DR2 using Deep Learning
• The S2 Stream: the shreds of a primitive dwarf galaxy
• Purveyors of fine halos. II. Chemodynamical association of halo stars with Milky Way globular clusters
• The R-Process Alliance: Chemo-Dynamically Tagged Groups II. An Extended Sample of Halo $r$-Process-Enhanced Stars
• Dynamically Tagged Groups of Metal-Poor Stars II. The Radial Velocity Experiment Data Release 6
• Cataloging Accreted Stars within Gaia DR2 using Deep Learning
• The GALAH Survey: Accreted stars also inhabit the Spite Plateau
• Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream
• Charting Galactic Accelerations with Stellar Streams and Machine Learning
• Using Action Space Clustering to Constrain the Accretion History of Milky Way like Galaxies
• Young nearby open clusters and their luminosity functions
• Frequencies, chaos and resonances: a study of orbital parameters of nearby thick disc and halo stars
• Variation in the Stellar Mass Function Along Stellar Streams
• How well can we unravel the accreted constituents of the Milky Way stellar halo? A test on cosmological hydrodynamical simulations
• Exploring the ex-situ components within Gaia DR3
• Weakly-Supervised Anomaly Detection in the Milky Way
• Measuring the Matter Density of the Galactic Disk Using Stellar Streams
• Applying machine learning to Galactic Archaeology: how well can we recover the origin of stars in Milky Way-like galaxies?
• One Stream or Two -- Exploring Andromeda's North West Stream
• Machine Learning for Galactic Archaeology: A chemistry-based neural network method for identification of accreted disc stars