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Estructuras lineales en el núcleo del cúmulo de galaxias Coma
J S Sanders1, A C Fabian, E Churazov
1Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany. jsanders@mpe.mpg.de
Science (New York, N.Y.)
|September 21, 2013
Resumen
Los núcleos de los cúmulos de galaxias exhiben estructuras a gran escala, lo que desafía las teorías de la turbulencia. Las observaciones de rayos X de Deep Chandra revelan brazos de larga vida y baja entropía, lo que sugiere una turbulencia y una conducción suprimidas debido a los campos magnéticos.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Cúmulos de galaxias Los cúmulos de galaxias.
- Física del plasma es la física del plasma.
Sus antecedentes:
- Los cúmulos de galaxias contienen plasma caliente que emite rayos X.
- Se predice que el movimiento turbulento en este plasma contribuye significativamente a la densidad de energía.
- Comprender la dinámica del plasma es crucial para la evolución de los cúmulos.
Objetivo del estudio:
- Investigar la estructura y la dinámica del plasma en el núcleo del cúmulo Coma.
- Determinar el tiempo de vida y el origen de las estructuras plasmáticas observadas.
- Evaluar el impacto de estas estructuras en la turbulencia y la conducción.
Principales métodos:
- Observaciones del Observatorio de rayos X Deep Chandra del cúmulo Coma.
- Análisis de brazos cuasi-lineales de alta densidad que abarcan 150 kiloparsecs.
- El rastreo de material de baja entropía probablemente despojado de la fusión de subgrupos.
Principales resultados:
- Descubrimiento de brazos extensos y coherentes de baja entropía en el núcleo del cúmulo Coma.
- Identificación de las conexiones entre estos brazos y un subgrupo de galaxias en fusión.
- Evidencia de coherencia durante varios cientos de millones de años.
Conclusiones:
- Las estructuras observadas implican una turbulencia isotrópica suprimida y una conducción en el núcleo del cúmulo.
- Es probable que los campos magnéticos sean los responsables de suprimir la turbulencia y la conducción.
- Estos hallazgos ofrecen información sobre la actividad de fusión de subgrupos en los últimos mil millones de años.
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