Element abundance analysis of the metal-rich stellar halo and high-velocitythick disk in the galaxy
arXiv:2105.03152 · doi:10.3847/1538-4357/abff52
Abstract
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, wedefined two kinds of star sample: high-velocity thick disk (HVTD) with and metal-richstellar halo (MRSH) with . Due to high resolution spectra data from APOGEE (DR16),we can analyze accurately the element abundance distribution of HVTD and MRSH. These elementsabundance constituted a multidimensional data space, and we introduced an algorithm method forprocessing multi-dimensional data to give the result of dimensionality reduction clustering. Accordingto chemical properties analysis, we derived that some HVTD stars could origin from the thin disk,and some MRSH stars from dwarf galaxies, but those stars which have similar chemical abundancecharacteristics in both sample may form in-situ.
arXiv comment11 pages, 8 figures, accepted for publication in ApJ
References in corpus (93)
- Astropy: A Community Python Package for Astronomy
- emcee: The MCMC Hammer
- Gaia Data Release 2. Summary of the contents and survey properties
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
- Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
- The Galaxy in Context: Structural, Kinematic and Integrated Properties
- 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
- Radial Mixing in Galactic Discs
- Co-formation of the Galactic disc and the stellar halo
- The Radial Velocity Experiment (RAVE): first data release
- Gaia Data Release 2: using Gaia parallaxes
- Chemical evolution with radial mixing
- Kinematics of Metal-Poor Stars in the Galaxy. III. Formation of the Stellar Halo and Thick Disk as Revealed from a Large Sample of Non-Kinematically Selected Stars
- Two Stellar Components in the Halo of the Milky Way
- alpha-, r-, and s-process element trends in the Galactic thin and thick disks
- Simulations of Galaxy Formation in a Lambda CDM Universe II: The Fine Structure of Simulated Galactic Disks
- Two distinct halo populations in the solar neighborhood. Evidence from stellar abundance ratios and kinematics
- Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
- Estimating distances from parallaxes
- Structure and Kinematics of the Stellar Halos and Thick Disks of the Milky Way Based on Calibration Stars from SDSS DR7
- Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
- APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
- Gaia Data Release 2: Mapping the Milky Way disc kinematics
- The Galactic Thick Disk Stellar Abundances
- The Emergence of the Thick Disk in a CDM Universe
- Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
- A New Mechanism for Radial Migration in Galactic Disks: Spiral-Bar Resonance Overlap
- Evidence from the H3 Survey that the Stellar Halo is Entirely Comprised of Substructure
- In disguise or out of reach: first clues about in-situ and accreted stars in the stellar halo of the Milky Way from Gaia DR2
- Origin and structure of the Galactic disc(s)
- The Biggest Splash
- Galaxy Disks
- Breathing FIRE: How Stellar Feedback Drives Radial Migration, Rapid Size Fluctuations, and Population Gradients in Low-Mass Galaxies
- The birth of the Milky Way as uncovered by accurate stellar ages with Gaia
- Red giant masses and ages derived from carbon and nitrogen abundances
- Multiple retrograde substructures in the Galactic halo: A shattered view of Galactic history
- A high resolution VLT/FLAMES study of individual stars in the centre of the Fornax dwarf spheroidal galaxy
- The Sausage Globular Clusters
- Gaia reveals a metal-rich in-situ component of the local stellar halo
- Two distinct halo populations in the solar neighborhood. II. Evidence from stellar abundances of Mn, Cu, Zn, Y, and Ba
- The Case for the Dual Halo of the Milky Way
- Carbon, nitrogen and -element abundances determine the formation sequence of the Galactic thick and thin disks
- Estimating distances from parallaxes. II. Performance of Bayesian distance estimators on a Gaia-like catalogue
- Isochrone ages for ~3 million stars with the second Gaia data release
- Dynamical Relics of the Ancient Galactic Halo
- Formation of In Situ Stellar Haloes in Milky Way-Mass Galaxies
- Carbon-Enhanced Metal-Poor Stars in the Inner and Outer Halo Components of the Milky Way
- Estimating distances from parallaxes. III. Distances of two million stars in the Gaia DR1 catalogue
- Apocenter Pile-Up: Origin of the Stellar Halo Density Break
- The origin of galactic metal-rich stellar halo components with highly eccentric orbits
- Galactic Stellar Populations in the Era of SDSS and Other Large Surveys
- The Formation of a Disk Galaxy within a Growing Dark Halo
- The Gaia-ESO Survey: the chemical structure of the Galactic discs from the first internal data release
- The Stellar Metallicity Distribution Function of the Galactic Halo from SDSS Photometry
- Sausage & Mash: The dual origin of the Galactic thick disc and halo from the gas-rich Gaia-Enceladus-Sausage merger
- Resolving the Metallicity Distribution of the Stellar Halo with the H3 Survey
- Timing the Early Assembly of the Milky Way with the H3 Survey
- The Halo's Ancient Metal-Rich Progenitor Revealed with BHB Stars
- Orbital Eccentricity as a probe of Thick Disk Formation Scenarios
- Metal Abundances and Kinematics of Bright Metal-Poor Giants Selected from the LSE Survey: Implications for the Metal-Weak Thick Disk
- On the alleged duality of the Galactic halo
- Population Studies. XIII. A New Analysis of the Bidelman-MacConnell "Weak-Metal" Stars - Confirmation of Metal-Poor Stars in the Thick Disk of the Galaxy
- Spatial variations in the Milky Way disc metallicity-age relation
- Ages and masses of million Galactic disk main sequence turn-off and sub-giant stars from the LAMOST Galactic spectroscopic surveys
- Chemo-orbital evidence from SDSS/SEGUE G-type dwarf stars for a mixed origin of the Milky Way's thick disk
- Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk
- The Fractions of Inner- and Outer-Halo Stars in the Local Volume
- Evidence for the Third Stellar Population in the Milky Way's Disk
- The Kinematic Properties of BHB and RR Lyrae stars towards the Anticentre and the North Galactic Pole: The Transition between the Inner and the Outer Halo
- Local stellar kinematics from RAVE data: III. Radial and Vertical Metallicity Gradients based on Red Clump Stars
- The dynamically selected stellar halo of the Galaxy with Gaia and the tilt of the velocity ellipsoid
- Chemical and Kinematic Properties of the Galactic Disk from the LAMOST and Gaia Sample Stars
- Non-local thermodynamic equilibrium stellar spectroscopy with 1D and 3D models - II. Chemical properties of the Galactic metal-poor disc and the halo
- The Metallicity Gradient of the Thick Disk Based on Red Horizontal Branch Stars From SDSS DR8
- The chemodynamics of prograde and retrograde Milky Way stars
- Vertical and radial metallicity gradients in high latitude galactic fields with SDSS
- Disk-Like Chemistry of the Triangulum-Andromeda Overdensity as Seen by APOGEE
- The nature of the Milky Way's stellar halo revealed by the three integrals of motion
- The stellar metallicity distribution in intermediate latitude fields with BATC and SDSS data
- Metallicity and Kinematics of the Galactic halo from the LAMOST sample stars
- High- and Low- Disk Stars Separate Dynamically at all Ages
- Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
- The stellar metallicity distribution of the Milky Way from the BATC survey
- Photometric Metallicity Calibration with SDSS and SCUSS and its Application to distant stars in the South Galactic Cap
- Kinematics of the Galactic disk from LAMOST Dwarf sample
- Insights into the Formation and Evolution History of the Galactic Disk System
- On the Origin of Metal-poor Stars in the Solar Neighborhood
- Existence of the Metal-Rich Stellar Halo and High-velocity Thick Disk in the Galaxy
- A Monte-Carlo Method for Estimating Stellar Photometric Metallicity Distributions
- Galactic Stellar Populations from Photometric Metallicity Distribution Functions