J/ApJ/874/74 Local stellar halo member stars from Gaia DR2 & LAMOST (Li+, 2019)
The substructures in the local stellar halo from Gaia and LAMOST.
Li H., Du C., Liu S., Donlon T., Newberg H.J.
<Astrophys. J., 874, 74-74 (2019)>
=2019ApJ...874...74L 2019ApJ...874...74L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, halo; Milky Way; Associations, stellar; Space velocities;
Abundances, [Fe/H]; Spectra, optical; Surveys
Keywords: Galaxy: halo; Galaxy: kinematics and dynamics; solar neighborhood
Abstract:
Based on the second Gaia data release and spectroscopy from the Large
Sky Area Multi-Object Fiber Spectroscopic Telescope Data, we
identified 20,089 halo stars kinematically and chemically. The halo
streams in the solar neighborhood could be detected in the space of
energy and angular momentum. We reshuffle the velocities of these
stars to determine the significance of substructure. Finally, we
identify four statistically significant substructures that are labeled
GL-1 through 4. Among these substructures, GL-1 is a previously known
stream ("N2" stream), and the other three substructures are new. These
substructures may be the debris of dwarf galaxy accretion event; their
dynamical and chemical information can help us to understand the
history of the Milky Way.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 92 53 GL-2 member stars
table3.dat 92 116 GL-3 member stars
table4.dat 92 75 GL-4 member stars
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/A+A/430/165 : Radial velocities for 6691 K and M giants (Famaey+, 2005)
J/AJ/134/1579 : Halo stars in solar neighborhood (Kepley+, 2007)
J/ApJ/698/865 : Halo streams in the SDSS-DR7 (Klement+, 2009)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/A+A/566/A118 : A comprehensive view of Virgo stellar stream (Duffau+, 2014)
J/A+A/583/A76 : Omega Cen candidates RAVE-selected (Fernandez-Trincado+, 2015)
J/other/RAA/17.62 : Candidate members of 4 stellar streams (Li+, 2017)
J/AJ/156/90 : New cat. of APOGEE RV standard stars (Huang+, 2018)
Byte-by-byte Description of file: table[234].dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- Gaia Gaia DR2 identifier
21- 29 I9 --- ObsID [7013119/576315040] LAMOST DR5 obsID
31- 36 F6.2 deg GLON Galactic longitude
38- 43 F6.2 deg GLAT [-61/88] Galactic latitude
45- 49 F5.2 [-] [Fe/H] [-2.25/0.23] Metallicity
51- 54 F4.1 kpc X [3.8/13] Galactocentric x coordinate
56- 59 F4.1 kpc Y [-6/3.6] Galactocentric y coordinate
61- 64 F4.1 kpc Z [-3.2/5.2] Galactocentric z coordinate
66- 71 F6.1 km/s U [-254/253] U component of space velocity
73- 78 F6.1 km/s V [-216/136] V component of space velocity
80- 85 F6.1 km/s W [-197/208] W component of space velocity
87- 92 F6.1 km.s-1.kpc Lz [-536/1073] z-angular momentum
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 23-Oct-2023