Results 111 to 120 of about 3,622,393 (232)

Investigating the Lower Limit of Metallicity for the Galactic Thin Disk

The Astrophysical Journal
We explore the metal-poor regime of the Galactic disk on the distribution of stars in the [ α /M]– V _ϕ plane, to identify the most metal-poor thin disk (MPTnD) stars belonging to the low- α sequence.
Guozhen Hu, Zhengyi Shao, Erbil Gügercinoǧlu, Wenyuan Cui   +3 more
doaj   +1 more source

Role of Gaseous Disk in the Formation of the Spiral Structure of the Milky Way Galaxy

Open Astronomy, 2016
We use observational gaseous and stellar density distributions in the disk of the Milky Way (MW) galaxy together with the disk rotation curve and measured disk velocity dispersion to build collisionless and combined collisionless-gaseous equilibrium ...
Korchagin V. I., Khoperskov S. A., Khoperskov A. V.   +2 more
doaj   +1 more source

Dynamics and configurations of galaxy triplets [PDF]

The purpose is to infer the probable dynamical states of galaxy triplets by the observed data on their configurations. Two methods are proposed for describing the distributions of the triplet configuration parameters characterizing a tendency to ...
Anosova, Joanna P., Chernin, Arthur D., Ivanov, Alexei V., Kiseleva, Ljudmila G., Orlov, Victor V.   +4 more
core   +1 more source

The Quest for a Stable Disk

The Astrophysical Journal
The majority of disk galaxies manifest spirals and/or bars that are believed to result from dynamical instabilities. However, some galaxies have featureless disks, which are therefore inferred to be dynamically stable.
J. A. Sellwood, R. G. Carlberg
doaj   +1 more source

Metal-poor Stars in the MW Disk: Resonant Cooling of Vertical Oscillations of Halo Stars in Barred Galaxies

The Astrophysical Journal Letters
Using numerical simulations of a barred disk galaxy embedded in nonspinning and spinning dark matter (DM) halos, we present a novel mechanism of “cooling” the vertical oscillations of DM particles, which acquire disk kinematics.
Xingchen Li, Isaac Shlosman, Daniel Pfenniger, Clayton Heller   +3 more
doaj   +1 more source

A Strong Falsification of the Universal Radial Acceleration Relation in Galaxies

The Astrophysical Journal
In the past few decades, many studies revealed that there exist some apparent universal relations that can describe the dynamical properties in galaxies.
Man Ho Chan
doaj   +1 more source

The spheroidal bulge of the Milky Way: Chemodynamically distinct from the inner-thick disc and bar

Astronomy & Astrophysics
Studying the composition and origin of the inner region of our Galaxy—the “Galactic bulge”—is crucial for understanding the formation and evolution of the Milky Way and other galaxies.
Nepal S., Chiappini C., Pérez-Villegas A., Queiroz A. B., Souza S., Steinmetz M., Anders F., Khalatyan A., Barbuy B., Guiglion G.   +9 more
doaj   +1 more source

A Physically Motivated Framework to Compare the Merger Timescales of Isolated Low- and High-mass Galaxy Pairs Across Cosmic Time

The Astrophysical Journal
The merger timescales of isolated low-mass pairs (10 ^8 < M _* < 5 × 10 ^9 M _⊙ ) on cosmologically motivated orbits have not yet been studied in detail, though isolated high-mass pairs (5 × 10 ^9 < M _* < 10 ^11 M _⊙ ) have been studied extensively.
Katie Chamberlain, Ekta Patel, Gurtina Besla, Paul Torrey, Vicente Rodriguez-Gomez   +4 more
doaj   +1 more source

Dynamics of Galaxy Interactions [PDF]

, 1998
This review briefly and very informally summarizes some of my ongoing research. One unifying theme in my work is the use of computers to bridge the gap between human and astronomical time-scales. Galactic collisions are an example; the dynamics of interacting galaxies can be visualized with numerical simulations.
openaire   +1 more source

Mass and Metal Flows in Isolated IllustrisTNG Halos

The Astrophysical Journal
The circumgalactic medium (CGM) is a reservoir of metals and star-forming fuel. Most baryons in the Universe are in the CGM or the intergalactic medium (IGM). The baryon cycle—how mass and metals reach the CGM from the inner regions of the galaxy and how
Jacob Morgan, Jeremy Bailin, Annelia Anderson   +2 more
doaj   +1 more source