Results 91 to 100 of about 200,659 (240)

Icarus Revisited: An Ancient, Metal-poor Accreted Stellar Stream in the Disk of the Milky Way

The Astrophysical Journal
The search for accreted satellites in the Galactic disk is a challenging task, to which Gaia plays a crucial role in synergy with ground-based spectroscopic surveys. In 2021, P. Re Fiorentin et al.
Paola Re Fiorentin, Alessandro Spagna, Mario G. Lattanzi, Michele Cignoni, Sara Vitali   +4 more
doaj   +1 more source

Dynamical evidence of the age-metallicity relation in the Milky Way disk [PDF]

Astronomy & Astrophysics, 2006
We studied the relationship between the average stellar abundance of several elements and the orbital evolution of stars in the neighbourhood of the Sun, using both observational data for 325 late-type dwarfs in a volume-complete sample and simulations of the orbital diffusion.
H. J. Rocha-Pinto, G. F. Porto de Mello, G. A. Bragança, Rafael Henrique Oliveira Rangel, Walter J. Maciel   +4 more
openaire   +4 more sources

A dynamical model of the local cosmic expansion

, 2014
We combine the equations of motion that govern the dynamics of galaxies in the local volume with Bayesian techniques in order to fit orbits to published distances and velocities of galaxies within $\sim 3$ Mpc. We find a Local Group (LG) mass $2.3\pm 0.7\
Ma, Yin-Zhe, McConnachie, Alan, Peñarrubia, Jorge, Walker, Matthew G.   +3 more
core   +1 more source

An Inward-moving and Asymmetric Velocity Wave Detected in LAMOST-Gaia

The Astrophysical Journal Letters
The phase space, as coded by kinematic parameters and chemical abundances, is crucial for understanding the formation of the Galactic disk. Using red giant stars from the Galactic thin disk with [Fe/H] > − 0.8 and low- α ratios identified in LAMOST-Gaia,
Yuqin Chen, Gang Zhao, Wenbo Wu, Zixi Guo, Haopeng Zhang, Zhuohan Li   +5 more
doaj   +1 more source

Finding r-II Sibling Stars in the Milky Way with the Greedy Optimistic Clustering Algorithm

The Astrophysical Journal, 2023
R -process enhanced stars with [Eu/Fe] ≥ +0.7 (so-called r -II stars) are believed to have formed in an extremely neutron-rich environment in which a rare astrophysical event (e.g., a neutron-star merger) occurred.
Kohei Hattori, Akifumi Okuno, Ian U. Roederer   +2 more
doaj   +1 more source

Dynamical evolution of a bulge in an N-body model of the Milky Way [PDF]

EPJ Web of Conferences, 2012
2 pages, 2 figures, to appear in the proceedings of "Assembling the Puzzle of the Milky Way", Le Grand Bornand (April 17-22, 2011), C. Reyle, A. Robin, M. Schultheis (eds.)
Ortwin Gerhard, Kanak Saha, Inma Martinez-Valpuesta   +2 more
openaire   +4 more sources

Structure, Kinematics, and Observability of the Large Magellanic Cloud’s Dynamical Friction Wake in Cold versus Fuzzy Dark Matter

The Astrophysical Journal, 2023
The Large Magellanic Cloud (LMC) will induce a dynamical friction (DF) wake on infall to the Milky Way (MW). The MW’s stellar halo will respond to the gravity of the LMC and the dark matter (DM) wake, forming a stellar counterpart to the DM wake.
Hayden R. Foote, Gurtina Besla, Philip Mocz, Nicolás Garavito-Camargo, Lachlan Lancaster, Martin Sparre, Emily C. Cunningham, Mark Vogelsberger, Facundo A. Gómez, Chervin F. P. Laporte   +9 more
doaj   +1 more source

Dynamical heating across the Milky Way disc using APOGEE and Gaia [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
Abstract The kinematics of the Milky Way disc as a function of age are well measured at the solar radius, but have not been studied over a wider range of Galactocentric radii. Here, we measure the kinematics of mono-age, mono-[Fe/H] populations in the low and high [α/Fe] discs between 4 ≲ R ≲ 13 kpc and |z| ≲ 2 kpc using 65 719 stars in ...
Steven R. Majewski, Marie Martig, Victor Silva Aguirre, Jo Bovy, J. Ted Mackereth, J. Ted Mackereth, Gail Zasowski, David L. Nidever, Jennifer Sobeck, Marc H. Pinsonneault, Ricardo P. Schiavon, Diane Feuillet, Wilma H. Trick, Andrea Miglio, Henry W. Leung, Katia Cunha, J. Tayar, William J. Chaplin   +17 more
openaire   +4 more sources

Dynamical Models of the Milky Way in Action Space with LAMOST DR8 and Gaia EDR3

The Astrophysical Journal
This work explores dynamical models of the Milky Way (MW) by analyzing a sample of 86,109 K giant stars selected through cross-matching the LAMOST DR8 and Gaia EDR3 surveys. Our earlier torus models of Q. Wang et al.
Guang-Chen Sun, Qiao Wang, Shude Mao, Yichao Li, Richard J. Long, Ping-Jie Ding, Yougang Wang, Xin Zhang, Xuelei Chen   +8 more
doaj   +1 more source

Orbital Torus Imaging: Acceleration, Density, and Dark Matter in the Galactic Disk Measured with Element Abundance Gradients

The Astrophysical Journal
Under the assumption of a simple and time-invariant gravitational potential, many Galactic dynamics techniques infer the milky Way’s mass and dark matter distributions from stellar kinematic observations.
Danny Horta, Adrian M. Price-Whelan, David W. Hogg, Kathryn V. Johnston, Lawrence Widrow, Julianne J. Dalcanton, Melissa K. Ness, Jason A. S. Hunt   +7 more
doaj   +1 more source