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Burbujas calientes de núcleos galácticos activos como fuente de calor en los cúmulos de flujo de enfriamiento.
Marcus Brüggen1, Christian R Kaiser
1International University Bremen, Campus Ring 1, 28759 Bremen, Germany. m.brueggen@iu-bremen.de
Nature
|July 19, 2002
Resumen
Los núcleos galácticos activos en los cúmulos de galaxias inflan burbujas flotantes. Estas burbujas agitan el gas caliente, aumentando los tiempos de enfriamiento y reduciendo la deposición de gas frío, al contrario de los modelos de flujo de enfriamiento anteriores.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Cosmología Cosmología.
- Física del plasma es la física del plasma.
Sus antecedentes:
- Los cúmulos de galaxias contienen plasma caliente que emite rayos X.
- Los picos de brillo de rayos X centrales observados sugieren flujos de enfriamiento de gas.
- Existen discrepancias entre el gas frío predicho y el observado, lo que implica tasas de deposición de masa más bajas.
Objetivo del estudio:
- Investigar el impacto de los núcleos galácticos activos (AGN) en el enfriamiento del gas en los cúmulos de galaxias.
- Reevaluar el modelo de flujo de enfriamiento a la luz de la actividad de AGN.
- Cuantificar el efecto de las burbujas flotantes en la termodinámica de los gases.
Principales métodos:
- Simulaciones hidrodinámicas de alta resolución.
- Modelado de burbujas de plasma infladas por AGN.
- Analizando la entropía del gas y los tiempos de enfriamiento en núcleos de racimo simulados.
Principales resultados:
- Burbujas flotantes se elevan a través de la atmósfera del cúmulo, agitando el gas.
- Las simulaciones muestran un aumento de los tiempos de enfriamiento en las regiones de clúster interior.
- Reducción significativa en la deposición de gas frío debido a la actividad de burbujas.
Conclusiones:
- Las burbujas flotantes impulsadas por AGN juegan un papel crucial en la regulación del enfriamiento del gas en los cúmulos de galaxias.
- El modelo de flujo de enfriamiento puede ser incompleto sin tener en cuenta la retroalimentación AGN.
- Estos hallazgos concilian las discrepancias en las cantidades de gas frío observadas.
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