The Pristine survey -- XVI. The metallicity of 26 stellar streams around the Milky Way detected with the STREAMFINDER in Gaia EDR3

Abstract

We use the photometric metallicities provided by the panoramic Pristine survey to study the veracity and derive the metallicities of the numerous stellar streams found by the application of the STREAMFINDER algorithm to the Gaia EDR3 data. All 26 streams present in Pristine show a clear metallicity distribution function, which provides an independent check of the reality of these structures, supporting the reliability of STREAMFINDER in finding streams and the power of Pristine to measure precise metallicities. We further present 6 candidate structures with coherent phase-space and metallicity signals that are very likely streams. The majority of studied streams are very metal-poor (14 structures with [Fe/H]<-2.0) and include 3 systems with [Fe/H]<-2.9 (C-11, C-19, and C-20). These streams could be the closest debris of low-luminosity dwarf galaxies or may have originated from globular clusters of significantly lower metallicity than any known current Milky Way globular cluster. Our study shows that the promise of the Gaia data for Galactic Archeology studies can be substantially strengthened by quality photometric metallicities, allowing us to peer back into the earliest epochs of the formation of our Galaxy and its stellar halo constituents.

25 pages, 29 figures, accepted for publication in MNRAS. Updated version has only minor changes compared to initial submission. The metallicity of most streams have marginally changed in the updated version

References in corpus (48)

• The Gaia mission
• The Radial Velocity Experiment (RAVE): first data release
• The Milky Way Tomography with SDSS: II. Stellar Metallicity
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• Detection of a 63 Degree Cold Stellar Stream in the Sloan Digital Sky Survey
• The Biggest Splash
• An Orphan in the "Field of Streams"
• SkyMapper Southern Survey: Second Data Release (DR2)
• The GALAH Survey: Observational Overview and Gaia DR1 companion
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
• Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES
• The Global Dynamical Atlas of the Milky Way mergers: Constraints from Gaia EDR3 based orbits of globular clusters, stellar streams and satellite galaxies
• Dynamical Relics of the Ancient Galactic Halo
• A 22 Degree Tidal Tail for Palomar 5
• $S^5$: The Orbital and Chemical Properties of One Dozen Stellar Streams
• A Low-Mass Stellar-Debris Stream Associated with a Globular Cluster Pair in the Halo
• The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams
• Orbital Clustering Identifies the Origins of Galactic Stellar Streams
• Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream
• The Complex Structure of Stars in the Outer Galactic Disk as revealed by Pan-STARRS1
• The Pristine Survey -- VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates
• The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
• Variations in the width, density, and direction of the Palomar 5 tidal tails
• The eye of Gaia on globular clusters structure: tidal tails
• The Pristine survey III: Spectroscopic confirmation of an efficient search for extremely metal-poor stars
• Pristine IX: CFHT ESPaDOnS Spectroscopic Analysis of 115 Bright Metal-Poor Candidate Stars
• A stellar stream remnant of a globular cluster below the metallicity floor
• An old, metal-poor globular cluster in Sextans A and the metallicity floor of globular cluster systems
• The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
• The tidal remnant of an unusually metal-poor globular cluster
• High-resolution spectroscopy of the GD-1 stellar stream localizes the perturber near the orbital plane of Sagittarius
• Detection of Strong Epicyclic Density Spikes in the GD-1 Stellar Stream. An Absence of Evidence for the Influence of Dark Matter Subhalos?
• Chemo-dynamical properties of the Anticenter Stream: a surviving disc fossil from a past satellite interaction
• The minimum metallicity of globular clusters and its physical origin -- implications for the galaxy mass-metallicity relation and observations of proto-globular clusters at high redshift
• Detection of a 50 degree-long Trailing Tidal Tail for the Globular Cluster M5
• Stellar Metallicities from SkyMapper Photometry II: Precise photometric metallicities of $\sim$280,000 giant stars with [Fe/H] $<-0.75$ in the Milky Way
• The Complexity of the Cetus Stream Unveiled from the Fusion of STREAMFINDER and StarGO
• The Pristine survey XIII: Uncovering the very metal-poor tail of the thin disc
• The hidden past of M92: Detection and characterization of a newly formed 17° long stellar stream using the Canada-France Imaging Survey
• Phase-space correlation in stellar streams of the Milky Way halo: The clash of Kshir and GD-1
• An extremely metal-deficient globular cluster in the Andromeda Galaxy
• Chemical Mapping of the Milky Way With The Canada-France Imaging Survey: A Non-parametric Metallicity-Distance Decomposition of the Galaxy
• The outer disc in shambles: blind detection of Monoceros and ACS with Gaia's astrometric sample
• A Blueprint for the Milky Way's Stellar Populations. II. Improved Isochrone Calibration in the SDSS and Pan-STARRS Photometric Systems
• Evidence for C and Mg variations in the GD-1 stellar stream
• 4MOST Consortium Survey 1: The Milky Way Halo Low-Resolution Survey
• The heavy-elements heritage of the falling sky

Cited by in corpus (24)

• Galactic Archaeology with Gaia
• The Cosmic Hunt for Members in the Outskirts of Ultra Faint Dwarf Galaxies: Ursa Major I, Coma Berenices, and Boötes I
• Metallicity Distribution Functions of 13 Ultra-Faint Dwarf Galaxy Candidates from Hubble Space Telescope Narrowband Imaging
• Euclid: Early Release Observations -- Deep anatomy of nearby galaxies
• A Swing of the Pendulum: The Chemodynamics of the Local Stellar Halo Indicate Contributions from Several Radial Merger Events
• ED-2: a cold but not so narrow stellar stream crossing the Solar neighbourhood
• GD-1 Stellar Stream and Cocoon in the DESI Early Data Release
• Exploring the chemodynamics of metal-poor stellar populations
• The Pristine survey: XXV. The very metal-poor Galaxy: Chemodynamics through the follow-up of the Pristine-Gaia synthetic catalogue
• The Pristine survey -- XX: GTC follow-up observations of extremely metal-poor stars identified from Pristine and LAMOST
• Prospects for Detecting Gaps in Globular Cluster Stellar Streams in External Galaxies with the Nancy Grace Roman Space Telescope
• Hidden deep in the halo: selection of a reduced proper motion halo catalogue and mining retrograde streams in the velocity space
• Nucleosynthetic yields of intermediate-mass primordial to extremely metal-poor stars
• Euclid: Early Release Observations of diffuse stellar structures and globular clusters as probes of the mass assembly of galaxies in the Dorado group
• Chemical Abundances of the Typhon Stellar Stream
• RR Lyrae stars as probes of the outer Galactic halo: Chemical and kinematic analysis of a pilot sample
• M92 (NGC~6341) Is a Metal-Complex Globular Cluster with an Atypical Primordial Population
• A Ghost in Boötes: The Least Luminous Disrupted Dwarf Galaxy
• Nearby stellar substructures in the Galactic halo from DESI Milky Way Survey Year 1 Data Release
• Searching for globular clusters in the inner halo of the Circinus galaxy
• The Pristine survey: XXVII. The extremely metal-poor stream C-19 stretches over more than 100 degrees
• Modeling Tidal Streams and Tidal Tails around Galaxies Using Deep Wendelstein Imaging Data
• Ancient, eclipsing, tidally-locked: A blue lurker progenitor in the population of extreme-velocity star candidates
• Rise of the forsaken relics: connecting present-day stellar streams and phase-mixed galaxies to the Epoch of Reionization