Results 1 to 10 of about 45,998 (281)

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

The PAndAS Field of Streams: stellar structures in the Milky Way halo toward Andromeda and Triangulum

, 2014
We reveal the highly structured nature of the Milky Way stellar halo within the footprint of the PAndAS photometric survey from blue main sequence and main sequence turn-off stars.
Babul, Arif, Bate, Nicholas F., Chapman, Scott C., Collins, Michelle L. M., Conn, Anthony R., Crnojević, Denija, Fardal, Mark A., Ferguson, Annette M. N., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F., Mackey, A. Dougal, Martin, Nicolas F., McConnachie, Alan W., Navarro, Julio F., Peñarrubia, Jorge, Rich, R. Michael, Tanvir, Nial T., Valls-Gabaud, David   +18 more
core   +3 more sources

The Milky Way’s Rowdy Neighbors: The Effects of the Large Magellanic Cloud and Sagittarius Dwarf on the Milky Way Disk

The Astrophysical Journal
The Milky Way (MW) is a barred spiral galaxy shaped by tidal interactions with its satellites. The Large Magellanic Cloud (LMC) and the Sagittarius dwarf galaxy (Sgr) are the dominant influences at the present day. This paper presents a suite of four 10 ^
Ioana A. Stelea, Jason A. S. Hunt, Kathryn V. Johnston   +2 more
doaj   +1 more source

The Magellanic Stream in Modified Newtonian Dynamics

, 2006
The dynamics of the Magellanic Stream (MS) as a series of clouds extending from the Magellanic Clouds (MCs) to the south Galactic pole is affected by the distribution and the amount of matter in the Milky Way. We calculate the gravitational effect of the
Haghi, Hossein, Hasani-Zonooz, Akram, Rahvar, Sohrab   +2 more
core   +1 more source

On the Corotation of Milky Way Satellites: LMC-mass Satellites Induce Apparent Motions in Outer Halo Tracers

The Astrophysical Journal
Understanding the physical mechanism behind the formation of a corotating thin plane of satellite galaxies, like the one observed around the Milky Way (MW), has been challenging.
Nicolás Garavito-Camargo, Adrian M. Price-Whelan, Jenna Samuel, Emily C. Cunningham, Ekta Patel, Andrew Wetzel, Kathryn V. Johnston, Arpit Arora, Robyn E. Sanderson, Lehman Garrison, Danny Horta   +10 more
doaj   +1 more source

Testing modified gravity with globular cluster velocity dispersions

, 2008
Globular clusters (GCs) in the Milky Way have characteristic velocity dispersions that are consistent with the predictions of Newtonian gravity, and may be at odds with Modified Newtonian Dynamics (MOND).
Famaey B., J. W. Moffat, Jaffe W., Sumner T. J., V. T. Toth   +4 more
core   +1 more source

HR-GO. II. Chemical Abundances of Low-E Retrograde Dynamically Tagged Groups: Revealing Thamnos as a Very Metal-poor Substructure

The Astrophysical Journal
Milky Way halo substructures identified in dynamical space are known to suffer from contamination from the Milky Way in situ stars, which makes their accreted origins uncertain. We present detailed chemical abundances of 35 stars belonging to two sets of
Renjing Xie, Zhen Yuan, Haining Li, Tadafumi Matsuno, Nicolas F. Martin, Ruizhi Zhang, Zhiqiang Yan, Federico Sestito, Guillaume F. Thomas, Projjwal Banerjee, Ruizheng Jiang, Linda Lombardo, David S. Aguado, Kohei Hattori, Gang Zhao   +14 more
doaj   +1 more source

Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars

The Astrophysical Journal Supplement Series
A detailed measurement is made of the metallicity distributions, kinematics, and dynamics of the thin and thick disks across a large disk volume (5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc) by using the LAMOST–APOGEE red clump stars.
Weixiang Sun, Han Shen, Biwei Jiang, Xiaowei Liu   +3 more
doaj   +1 more source

Radial Wave in the Galactic Disk: New Clues to Discriminate Different Perturbations

The Astrophysical Journal
Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way’s evolution history. The second Gaia data release unveils a novel wave pattern in the L _Z −〈 V _R 〉 space, but its formation ...
Chengye Cao, Zhao-Yu Li, Ralph Schönrich, Teresa Antoja   +3 more
doaj   +1 more source