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Measurement of Microtubule Dynamics by Spinning Disk Microscopy in Monopolar Mitotic Spindles
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A dynamically young and perturbed Milky Way disk.

T Antoja1, A Helmi2, M Romero-Gómez3

  • 1Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Barcelona, Spain. tantoja@fqa.ub.edu.

Nature
|September 21, 2018
PubMed
Summary
This summary is machine-generated.

The Milky Way

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Area of Science:

  • Astronomy and Astrophysics
  • Galactic Dynamics

Background:

  • The Milky Way's disk evolution is influenced by its bar, spiral arms, and satellite galaxies.
  • Dynamical processes cause stellar migration, heating, and velocity structure changes in the disk.
  • Previous studies detected kinematic substructures and deviations from equilibrium models.

Purpose of the Study:

  • To analyze the phase-space distribution of six million stars in the Milky Way disk.
  • To identify substructures and infer past dynamical perturbations.

Main Methods:

  • Analysis of spatial and velocity coordinates of six million stars.
  • Identification of phase-space substructures like 'snail shells' and ridges.

Main Results:

  • The phase-space distribution reveals distinct substructures.
  • A significant perturbation occurred 300-900 million years ago.
  • This timing aligns with the Sagittarius dwarf galaxy's pericentric passage.

Conclusions:

  • The Galactic disk is dynamically young and not in a steady state.
  • Modeling the disk as time-independent and axisymmetric is inaccurate.
  • Past interactions with satellite galaxies significantly shape the disk's evolution.