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Magnetically Induced Rotating Rayleigh-Taylor Instability
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The Radcliffe Wave is oscillating.

Ralf Konietzka1,2,3, Alyssa A Goodman4, Catherine Zucker4,5

  • 1Harvard University Department of Astronomy and Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA. ralf.konietzka@cfa.harvard.edu.

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|February 20, 2024
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Summary
This summary is machine-generated.

The Radcliffe Wave, a massive gas cloud structure, is confirmed to be oscillating through the Galactic plane and moving away from the Galactic Centre. This discovery provides insights into galactic dynamics and the origins of star formation.

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Area of Science:

  • Galactic Astronomy
  • Star Formation
  • Astrophysics

Background:

  • The Radcliffe Wave is a 2.7-kiloparsec-long sinusoidal chain of dense gas clouds located near our Sun.
  • Previous studies identified its wave-like shape via 3D dust mapping, but kinematic evidence for oscillation was inconclusive.
  • Understanding the Radcliffe Wave's motion is crucial for galactic structure and dynamics.

Purpose of the Study:

  • To provide kinematic evidence for the Radcliffe Wave's oscillation through the Galactic plane.
  • To investigate the Radcliffe Wave's radial motion relative to the Galactic Centre.
  • To use the Radcliffe Wave's motion to probe the local Galactic potential and the Sun's oscillation period.

Main Methods:

  • Utilized line-of-sight velocity measurements of 12CO (a carbon monoxide isotope).
  • Incorporated three-dimensional velocity data of young stellar clusters associated with the Radcliffe Wave.
  • Modeled the Radcliffe Wave as a coherently oscillating structure to derive its motion and galactic properties.

Main Results:

  • Presented evidence that the Radcliffe Wave is oscillating vertically through the Galactic plane.
  • Demonstrated that the Radcliffe Wave is drifting radially outwards from the Galactic Centre.
  • Showed that massive star-forming regions within the wave move consistently with gravitational acceleration from the Galactic potential.

Conclusions:

  • The Radcliffe Wave's motion confirms it as a dynamically significant structure within the Milky Way.
  • The study provides a method to independently measure local Galactic potential properties and the Sun's vertical oscillation period.
  • The outward drift suggests potential origins for the star cluster responsible for the Local Bubble.