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Un disco dinámicamente joven y perturbado de la Vía Láctea

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
Resumen
Este resumen es generado por máquina.

La Vía Láctea

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Área de la Ciencia:

  • Astronomía y astrofísica
  • Dinámica Galáctica

Sus antecedentes:

  • La evolución del disco de la Vía Láctea está influenciada por su barra, brazos espirales y galaxias satélite.
  • Los procesos dinámicos causan migración estelar, calentamiento y cambios en la estructura de velocidad en el disco.
  • Estudios anteriores detectaron subestructuras cinemáticas y desviaciones de los modelos de equilibrio.

Objetivo del estudio:

  • Para analizar la distribución de fase y espacio de seis millones de estrellas en el disco de la Vía Láctea.
  • Para identificar las subestructuras e inferir las perturbaciones dinámicas pasadas.

Principales métodos:

  • Análisis de coordenadas espaciales y de velocidad de seis millones de estrellas.
  • Identificación de las subestructuras de espacio de fase como las "conchas de caracol" y las crestas.

Principales resultados:

  • La distribución de espacio de fase revela subestructuras distintas.
  • Una perturbación significativa ocurrió hace 300-900 millones de años.
  • Esta sincronización se alinea con el paso pericéntrico de la galaxia enana de Sagitario.

Conclusiones:

  • El disco galáctico es dinámicamente joven y no está en un estado estable.
  • El modelado del disco como independiente del tiempo y asimétrico es inexacto.
  • Las interacciones pasadas con las galaxias satélite moldean significativamente la evolución del disco.