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Una diferencia de edad de dos mil millones de años entre un cúmulo globular rico en metales y uno pobre en metales

B M S Hansen¹, J S Kalirai, J Anderson

¹Division of Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA. hansen@astro.ucla.edu

|August 2, 2013

Resumen

Los cúmulos globulares revelan la historia de la formación de galaxias. El cúmulo globular rico en metales 47 Tucanae tiene 9.900 millones de años, formándose más tarde que los cúmulos pobres en metales como NGC 6397.

Área de la Ciencia:

La astronomía y la astrofísica.
Arqueología Galáctica Arqueología Galáctica
Evolución Estelar Evolución Estelar

Sus antecedentes:

Los cúmulos globulares son cruciales para comprender la formación y evolución de las galaxias.
La metalicidad y la edad de los cúmulos proporcionan información sobre la secuencia de formación de los componentes galácticos.
Los cúmulos pobres en metales se encuentran en halos galácticos, mientras que los cúmulos ricos en metales se encuentran en regiones interiores.

Objetivo del estudio:

Para determinar la edad absoluta del cúmulo globular rico en metales 47 Tucanae.
Para comparar el tiempo de formación de cúmulos globulares ricos en metales y pobres en metales.
Proporcionar evidencia cuantitativa para la secuencia de formación de los componentes galácticos.

Principales métodos:

Modelado de la secuencia de enfriamiento de las enanas blancas de los cúmulos globulares.
Utilizando técnicas precisas de datación de la edad de las poblaciones estelares.
Análisis comparativo de los datos de edad entre diferentes grupos de metalicidad.

Principales resultados:

El cúmulo globular rico en metales 47 Tucanae tiene una edad absoluta de 9.9 ± 0.7 mil millones de años.
Esta edad es aproximadamente dos mil millones de años más joven que el cúmulo pobre en metales NGC 6397.7.
La evidencia cuantitativa muestra que los cúmulos ricos en metales se formaron más tarde que los cúmulos halo pobres en metales.

Conclusiones:

Los cúmulos globulares ricos en metales como 47 Tucanae se formaron más tarde que los cúmulos halo pobres en metales como NGC 6397.
Esta diferencia de edad apoya un modelo de formación secuencial para los componentes galácticos.
Las edades de los cúmulos globulares son marcadores clave del conjunto jerárquico de galaxias.

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