Tracing the Origin of Moving Groups. III. Detecting Moving Groups in The LAMOST DR7

Abstract

We revisit the moving groups (MGs) in the solar neighborhood with a sample of 91969 nearby stars constructed from LAMOST DR7. Using the wavelet technique and Monte Carlo simulations, five MGs together with a new candidate located at $V\simeq$ -130 km s${}^{-1}$ are detected simultaneously in $V-\sqrt{U^2+2V^2}$ space. Taking into account the other known MGs, we conclude that MGs in the Galactic disk are spaced by approximately 15 $\sim$ 25 km s${}^{-1}$ along $V$ velocity. The origin of detected MGs is analysed through the distributions of [Fe/H]$-$[Mg/Fe] and ages. Our results support attributing the origin to the continuous resonant mechanisms probably induced by the bar or spiral arms of the Milky Way.

Accepted for the publication in ApJ

References in corpus (11)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• galpy: A Python Library for Galactic Dynamics
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• Is the Milky Way ringing? The hunt for high velocity streams
• Disentangling the Hercules stream
• Origin and evolution of moving groups I. Characterization in the observational kinematic-age-metallicity space
• Chemically Tagging the HR1614 Moving Group
• The Hyades stream: evaporated cluster or intrusion from the inner disk?
• Stellar Kinematic Constraints on Galactic Structure Models Revisited: Bar and Spiral Arm Resonances
• Three Moving Groups Detected in the LAMOST DR1 Archive
• The HR 1614 moving group is not a dissolving cluster

Cited by in corpus (1)

• Moving groups across Galactocentric radius with Gaia DR3