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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Dynamical Regularities in Rotating Galaxies.

Stacy McGaugh1, Federico Lelli2, Pengfei Li1

  • 1Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA.

Proceedings of the International Astronomical Union. International Astronomical Union
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

Galactic dynamical scaling relations reveal universal empirical laws. These laws connect diverse rotationally supported disk galaxies through a common acceleration scale.

Keywords:
galaxies: dwarfgalaxies: irregulargalaxies: kinematics and dynamicsgalaxies: spiralgalaxies: structure

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Area of Science:

  • Astrophysics
  • Galactic Dynamics
  • Observational Astronomy

Background:

  • Galaxies exhibit complex behaviors across vast ranges of mass, surface brightness, and gas content.
  • Understanding these behaviors requires identifying underlying physical principles and empirical relationships.

Purpose of the Study:

  • To review and synthesize the dynamical scaling relations observed in rotationally supported disk galaxies.
  • To identify unifying principles that govern the behavior of diverse galactic systems.

Main Methods:

  • Review of observational data for rotationally supported disk galaxies.
  • Analysis of dynamical scaling relations across a wide range of galactic properties.
  • Identification of empirical laws and common underlying scales.

Main Results:

  • Galactic dynamical scaling relations are strict and universally applicable to disk galaxies.
  • A few empirical laws effectively summarize the behavior of galaxies spanning many decades in mass, surface brightness, and gas content.
  • These laws are interconnected through a common acceleration scale.

Conclusions:

  • The observed dynamical scaling relations in disk galaxies are not random but follow fundamental empirical laws.
  • A single, common acceleration scale provides a unifying framework for understanding the dynamics of diverse galactic systems.
  • This finding simplifies the complex phenomenology of galaxies and points towards fundamental physics governing their evolution.