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El enriquecimiento por supernovas en cúmulos globulares con múltiples poblaciones
Jae-Woo Lee1, Young-Woon Kang, Jina Lee
1Department of Astronomy and Space Science, ARCSEC, Sejong University, Seoul 143-747, Korea. jaewoolee@sejong.ac.kr
Nature
|November 27, 2009
Resumen
Los cúmulos globulares, como el omega Centauri, pueden ser restos de galaxias enanas interrumpidas. Sus variaciones químicas sugieren orígenes de galaxias tempranas masivas, no sólo contaminación estelar interna.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Evolución galáctica Evolución galáctica.
Sus antecedentes:
- Se teoriza que Omega Centauri, el cúmulo globular más masivo de la Vía Láctea, es un núcleo perturbado de una galaxia enana.
- Los cúmulos globulares exhiben inhomogeneidades químicas, atribuidas a las supernovas (enriquecimiento de metales) y potencialmente a la contaminación estelar interna.
Objetivo del estudio:
- Para investigar los orígenes de las variaciones químicas en los cúmulos globulares.
- Para comparar las abundancias de calcio en siete cúmulos globulares con omega Centauri.
Principales métodos:
- Análisis de las abundancias de calcio (Ca) en siete cúmulos globulares.
- Comparación de estas abundancias con los datos de omega Centauri.
Principales resultados:
- Las abundancias de calcio y elementos pesados en los cúmulos globulares están vinculadas a las explosiones de supernovas.
- El potencial gravitacional de los cúmulos actuales es insuficiente para retener las eyecciones de supernovas.
Conclusiones:
- Los cúmulos globulares, similares a omega Centauri, son probablemente reliquias de galaxias enanas primitivas más masivas y perturbadas.
- Esto apoya el modelo de fusión jerárquica para la formación de galaxias.
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