Results 11 to 20 of about 43,519 (315)
Gas dynamics and large-scale morphology of the Milky Way galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 We present a new model for the gas dynamics in the galactic disk inside the Sun's orbit. Quasi-equilibrium flow solutions are determined in the gravitational potential of the deprojected COBE NIR bar and disk, complemented by a central cusp and, in some models, an outer halo.
P. Englmaier, Ortwin Gerhard
core +8 more sources
Celestial Mechanics and Dynamical Astronomy, 2006 The Milky Way is made up of a central bar, a disk with embedded spiral arms, and a dark matter halo. Observational and theoretical constraints for the characteristic parameters of these components will be presented, with emphasis on the constraints from the dynamics of the Milky Way gas.
Englmaier, Peter, Gerhard, Ortwin
openaire +5 more sources
Structure and Dynamics of the Milky Way: The Evolving Picture
, 2010 From the inception of radio astronomy, the study of the Interstellar Medium has been both aided and frustrated by one fact: we are right within it! Our embedded perspective is favourable to observing kinematic and structural details that are likely to remain inaccessible in external galaxies for some time, but not so to gaining a birdseye view of our ...
T. Foster, Brendan Cooper
openalex +4 more sources
Gas dynamics in the Milky Way: second pattern speed and large-scale morphology [PDF]
, 2003 We present new gas flow models for the Milky Way inside the solar circle. To this end we use SPH simulations in gravitational potentials determined from the NIR luminosity distribution (including spiral arms) which are based on the COBE/DIRBE maps.
Nicolai Bissantz +2 more
openalex +5 more sources
On the dynamics of tidal streams in the Milky Way galaxy
, 2010 We present a brief history of Galactic astrophysics, and explain the origin of halo substructure in the Galaxy. We motivate our study of tidal streams by highlighting the tight constraints that analysis of the trajectories of tidal streams can place on the form of the Galactic potential.
Andy Eyre
openalex +4 more sources
The barred inner Milky Way: dynamical models from surveys [PDF]
Proceedings of the International Astronomical Union, 2017 AbstractThe Milky Way is a barred galaxy whose central bulge has a box/peanut shape and consists of multiple stellar populations with different orbit distributions. This review describes dynamical and chemo-dynamical equilibrium models for the Bulge, Bar, and inner Disk based on recent survey data.
Gerhard, Ortwin
openaire +5 more sources
Testing two alternative theories to dark matter with the Milky Way dynamics [PDF]
, 2015 Two alternative theories to dark matter are investigated by testing their ability to describe consistently the dynamics of the Milky Way. The first one refers to a modified gravity theory having a running gravitational constant and the second assumes ...
Paulo L. C. de Oliveira +2 more
openalex +3 more sources
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
The Astrophysical Journal, 2023 We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber ...
Ayeon Lee +4 more
doaj +1 more source
Building an Acceleration Ladder with Tidal Streams and Pulsar Timing
The Astrophysical Journal Letters, 2023 We analyse stellar streams in action-angle coordinates combined with recent local direct acceleration measurements to provide joint constraints on the potential of our galaxy.
Peter Craig +3 more
doaj +1 more source
A dynamically young and perturbed Milky Way disk [PDF]
Nature, 2018 The evolution of the Milky Way disk, which contains most of the stars in the Galaxy, is affected by several phenomena. For example, the bar and the spiral arms of the Milky Way induce radial migration of stars and can trap or scatter stars close to orbital resonances.
Amina Helmi +14 more
openaire +10 more sources