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Las observaciones de Fermi-LAT del estallido de rayos gamma GRB 130427AA

M Ackermann¹, M Ajello, K Asano

¹Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany.

Science (New York, N.Y.)

|November 23, 2013

Resumen

El Telescopio Espacial de Rayos Gamma Fermi observó una explosión de rayos gamma excepcionalmente brillante (GRB) 130427A, desafiando los modelos estándar. Sus propiedades únicas sugieren explicaciones alternativas para la emisión de alta energía en fuentes astrofísicas.

Área de la Ciencia:

La astrofísica es la astrofísica.
Astrofísica de altas energías de alta energía.
La astronomía de rayos gamma es una astronomía de rayos gamma.

Sus antecedentes:

Las explosiones de rayos gamma (GRB) son poderosas y enigmáticas explosiones cósmicas.
La fase de resplandor posterior de los GRB se explica típicamente por la emisión de sincrotrones de electrones acelerados.
Comprender los mecanismos de emisión de GRB es crucial para la astrofísica.

Objetivo del estudio:

Para analizar las características únicas de la explosión de rayos gamma (GRB) 130427A.
Para restringir la naturaleza física de fuentes astrofísicas excepcionales como el GRB 130427A.
Para probar los modelos prevalecientes de emisión de alta energía en el resplandor posterior de GRB.

Principales métodos:

Observaciones realizadas con el Large Area Telescope (LAT) a bordo del Telescopio Espacial de Rayos Gamma Fermi.
Análisis temporal de la curva de luz de rayos gamma.
Análisis espectral de la emisión de alta energía.

Principales resultados:

GRB 130427A exhibió propiedades sin precedentes: mayor fluencia, fotón de mayor energía (95 GeV), mayor duración (20 horas) e inmensa liberación de energía isotrópica.
Las características temporales y espectrales observadas se desvían significativamente de las predicciones del modelo estándar de emisión de sincrotrones.
Los datos desafían el modelo de choque externo ampliamente aceptado para la emisión no térmica de alta energía.

Conclusiones:

El carácter excepcional de GRB 130427A requiere una reevaluación de los modelos actuales de emisiones de GRB.
Se pueden requerir mecanismos de emisión alternativos o modificados para explicar los fenómenos observados.
Los estudios adicionales de tales GRB extremos son vitales para avanzar en nuestra comprensión de la astrofísica de alta energía.

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