Results 41 to 50 of about 8,688,256 (155)

A Precise Milky Way

, 2018
The Milky Way Galaxy in which we live seems to be a normal spiral galaxy. But it can be hard to tell. Our perspective from within it precludes a "face-on" view like the picture above, which combines some real data with a lot of artistic liberty.
Stacy McGaugh
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

The dynamic Milky Way in the Gaia era [PDF]

The Milky Way is a relatively typical galaxy, and we are in the middle of it. That allows astronomers to observe an enormous amount of individual stars and their properties. With the success of the Gaia mission, the amount of catalogued stars is reaching
Koop, Orlin; id_orcid
core   +1 more source

The Orbital Eccentricities of Planets in the Kinematic Thin and Thick Galactic Disks

The Astronomical Journal
The orbital eccentricity distribution of exoplanets is shaped by a combination of dynamical processes, reflecting both formation conditions and long-term evolution.
Sheila Sagear, Sarah Ballard, Kathryne J. Daniel, Adrian M. Price-Whelan, Sóley Ó. Hyman, Gregory J. Gilbert, Christopher Lam   +6 more
doaj   +1 more source

The Age–Thickness Relation as a Tracer of the Merger History of Disk Galaxies

The Astrophysical Journal
In the hierarchical framework of galaxy formation, disk galaxies are shaped by a sequence of mergers and interactions, yet reconstructing this history from observations remains challenging.
Lekshmi Thulasidharan, Elena D’Onghia, Robert Benjamin, Ronald Drimmel, Eloisa Poggio   +4 more
doaj   +1 more source

Testing modified gravity theory in the Milky Way TESTING MODIFIED GRAVITY THEORY in the MILKY WAY NEGRELLI et al

, 2018
We perform a test of John Moffat's modified gravity theory (MOG) within the Milky Way, adopting the well-known "rotation curve" method. We use the dynamics of observed tracers within the disk to determine the gravitational potential as a function of ...
Iocco F., Benito M., Kraiselburd L., Negrelli C., Landau S.   +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

Internal proper motion dispersion profiles for 37 Milky Way globular clusters extracted from Gaia EDR3

, 2022
<p>Internal proper motion dispersion profiles, in the radial and tangential components, extracted from Gaia EDR3 data for 37 Milky Way globular clusters.</p> <p>Created for, and used for model fitting in, the submitted manuscript ...
Gieles, Mark, Smith, Peter J., Dickson, Nolan, Hénault-Brunet, Vincent, Nolan, Dickson, Baumgardt, Holger, Smith, Peter   +6 more
core   +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