The Nearest High-Velocity Stars Revealed by LAMOST Data Release 1

Abstract

We report the discovery of 28 candidate high-velocity stars (HVSs) at heliocentric distances of less than 3 kpc, based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 1. Our sample of HVS candidates covers a much broader color range than the equivalent ranges discussed in previous studies and comprises the first and largest sample of HVSs in the solar neighborhood. The sufficiently accurate observed and derived parameters for all candidates allow us to ascertain their nature as genuine HVSs, while a subset of 12 objects represents the most promising candidates. Our results also highlight the great potential of discovering statistically large numbers of HVSs of different spectral types in LAMOST survey data. This will ultimately enable us to achieve a better understanding of the nature of Galactic HVSs and their ejection mechanisms, and to constrain the structure of the Galaxy.

arXiv comment8 pages, 1 figure, 3 tables, accepted for publication in ApJ Letter

References in corpus (31)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• Correcting for the Effects of Interstellar Extinction
• The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
• The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
• The PPMXL catalog of positions and proper motions on the ICRS. Combining USNO-B1.0 and 2MASS
• Chemical evolution with radial mixing
• The Milky Way Tomography with SDSS: II. Stellar Metallicity
• Ejection of hypervelocity stars by the (binary) black hole(s) in the Galactic center
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo
• Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
• Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog
• Lifting the Dusty Veil With Near- and Mid-Infrared Photometry: I. Description and Applications of the Rayleigh-Jeans Color Excess Method
• The uncertainty in Galactic parameters
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• MMT Hypervelocity Star Survey
• Companion stars of Type Ia supernovae and hypervelocity stars
• The First Hypervelocity Star from the LAMOST Survey
• MMT Hypervelocity Star Survey. II. Five New Unbound Stars
• The Nature of the Hyper-Runaway Candidate HIP 60350
• Hypervelocity Star Candidates in the SEGUE G & K Dwarf Sample
• New release of the ELODIE library: Version 3.1
• Metal-poor hypervelocity star candidates from the Sloan Digital Sky Survey
• SDSS J013655.91+242546.0 - an A-type hyper-velocity star from the outskirts of the Galaxy
• SEGUE-2 Limits on Metal-Rich Old-Population Hypervelocity Stars In the Galactic Halo
• Old-Population Hypervelocity Stars from the Galactic Center: Limits from the SDSS
• Stars on the run: escaping from stellar clusters
• Origin and possible birthplace of the extreme runaway star HIP 60350
• Subdwarfs and white dwarfs from the 2MASS, Tycho-2, XPM and UCAC3 catalogues
• A halo blue straggler on a highly eccentric retrograde orbit

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• LAMOST observations in the Kepler field. II. Database of the low-resolution spectra from the five-year regular survey
• Relativistic effects on tidal disruption kicks of solitary stars
• High velocity stars from close interaction of a globular cluster and a super massive black hole
• Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk
• High velocity stars from the interaction of a globular cluster and a massive black hole binary
• Discovery of two new hypervelocity stars from the LAMOST spectroscopic surveys
• 591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
• LAMOST observations in the Kepler field. Analysis of the stellar parameters measured with the LASP based on the low-resolution spectra
• Estimation of distances to stars with stellar parameters from LAMOST
• Core-Collapse Supernovae in Binaries as the Origin of Galactic Hyper-Runaway Stars
• New nearby hypervelocity stars and their spatial distribution from Gaia DR2
• The central engine of GRB 130831A and the energy breakdown of a relativistic explosion
• Hypervelocity stars from star clusters hosting Intermediate-Mass Black Holes
• A new Hyper-Runaway star discovered from LAMOST and GAIA: ejected almost in the galactic rotation direction
• Impact of the Galactic Disk and Large Magellanic Cloud on the Trajectories of Hypervelocity Stars Ejected from the Galactic Center
• Constraints on the Galactic Centre environment from Gaia hypervelocity stars
• Candidate hypervelocity stars of spectral type G and K revisited
• Red Runaways: Hypervelocity Stars, Hills Ejecta and Other Outliers in the F-M Star Regime
• Comparing hypervelocity star populations from the Large Magellanic Cloud and the Milky Way
• Constraints on the Galactic Centre environment from \textit{Gaia} hypervelocity stars III: Insights on a possible companion to Sgr A*
• The origin of high velocity stars from Gaia and LAMOST
• Constraints on the Galactic Centre environment from Gaia hypervelocity stars II: The evolved population
• Intermediate-Mass Black Holes in binary-rich star clusters
• The luminosity function of quasars by the Principle of Maximum Entropy
• Constraints on the origins of hypervelocity stars: velocity distribution, mergers and star-formation history
• Runaway Dwarf Carbon Stars as Candidate Supernova Ejecta
• Detecting Stars at the Galactic Centre via Synchrotron Emission
• Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria