The Rapid Onset of Stellar Bars in the Baryon-dominated Centers of Disk Galaxies
The Astrophysical Journal, 2023 Recent observations of high-redshift galactic disks ( z ≈ 1–3) show a strong negative trend in the dark-matter (DM) fraction f _DM with increasing baryon surface density.
Joss Bland-Hawthorn +3 more
doaj +1 more source
The age structure of stellar populations in the solar vicinity Clues of a two-phase formation history of the Milky Way disk [PDF]
, 2013 We analyze a sample of solar neighborhood stars that have high-quality abundance determinations and show that there are two distinct regimes of [α/Fe] versus age, which we identify as the epochs of the thick and thin disk formation.
M. Haywood +4 more
semanticscholar +1 more source
Stellar kinematics from the symmetron fifth force in the Milky Way disk [PDF]
Physical Review D, 2018 It has been shown that the presence of non-minimally coupled scalar fields giving rise to a fifth force can noticeably alter dynamics on galactic scales.
C. O’Hare, C. Burrage
semanticscholar +1 more source
Clues to the formation of the Milky Way’s thick disk [PDF]
Astronomy & Astrophysics, 2015 7 pages, 6 figures, accepted for publication in A&A, replaced to include a correction on the color bar of figure 2 and ...
Haywood, M. +3 more
openaire +4 more sources
The Flattening Metallicity Gradient in the Milky Way’s Thin Disk [PDF]
The Astrophysical Journal, 2021 Abstract We calculate the ages, orbits and phase-space coordinates for a sample of ∼4 million LAMOST and Gaia stars. The ages are cross-matched and compared with values from two other popular age catalogs, which derive the ages using different methods.
John J. Vickers, Juntai Shen, Zhao-Yu Li
openaire +2 more sources
All-sky Kinematics and Chemistry of Monoceros Stellar Overdensity
The Astrophysical Journal, 2023 We explore the kinematic and chemical properties of the Monoceros stellar overdensity by combining data from the Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, APOGEE, and Gaia.
Lais Borbolato +9 more
doaj +1 more source
Are disk galaxies the progenitors of giant ellipticals? [PDF]
, 2007 A popular formation scenario for giant elliptical galaxies proposes that they might have formed from binary mergers of disk galaxies. Difficulties with the scenario that emerged from earlier studies included providing the necessary stellar mass and ...
Barden +69 more
core +4 more sources
THE RELATIONSHIP BETWEEN MONO-ABUNDANCE AND MONO-AGE STELLAR POPULATIONS IN THE MILKY WAY DISK [PDF]
, 2016 Studying the Milky Way disk structure using stars in narrow bins of [Fe/H] and [α/Fe] has recently been proposed as a powerful method to understand the Galactic thick and thin disk formation.
I. Minchev +6 more
semanticscholar +1 more source
Thin disk kinematics from RAVE and the solar motion [PDF]
, 2012 Aims. We study the Milky Way thin disk with the Radial Velocity Experiment (RAVE) survey. We consider the thin and thick disks as different Galactic components and present a technique to statistically disentangle the two populations.
Bertelli, G. +16 more
core +2 more sources
The Vertical Displacement of the Milky Way Disk [PDF]
Proceedings of the International Astronomical Union, 2016 AbstractAn oscillating vertical displacement of the Milky Way, with a wavelength of about 8 kpc and and amplitude of about 100 pc (increasing with distance from the Galactic center) is observed towards the Galactic anticenter. These oscillations are thought to be the result of disk perturbations from dwarf satellites of the Milky Way.
Newberg, Heidi Jo, Xu, Yan
openaire +2 more sources