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Detección de una contraparte de radio de la llamarada gigante del 27 de diciembre de 2004 desde SGR 1806-20-20
P B Cameron1, P Chandra, A Ray
1Division of Physics, Mathematics and Astronomy, 105-24, California Institute of Technology, Pasadena, California 91125, USA. pbc@astro.caltech.edu
Nature
|April 29, 2005
Resumen
Los investigadores detectaron una señal de radio de un magnetar (SGR 1806-20) después de una llamarada gigante. Esto permitió la primera medición directa de la distancia, lo que sugiere que la emisión de radio se originó a partir de escombros expulsados, no un típico resplandor.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Astrofísica de alta energía Astrofísica de alta energía
- Física de las estrellas de neutrones Física de las estrellas de neutrones
Sus antecedentes:
- Los repetidores blandos de rayos gamma (SGR) son transitorios de alta energía originados en magnetares, estrellas de neutrones con campos magnéticos extremadamente fuertes.
- Una poderosa llamarada gigante fue detectada desde SGR 1806-20 el 27 de diciembre de 2004.
Objetivo del estudio:
- Para detectar y caracterizar la contraparte de radio de la SGR 1806-20 llamarada gigante.
- Para determinar la distancia a SGR 1806-20 utilizando el análisis del espectro de radio.
- Para investigar el origen de la emisión de radio observada y sus implicaciones para los modelos de llamaradas magnetar.
Principales métodos:
- Monitoreo de radio de múltiples frecuencias (0,2 a 250 GHz) de SGR 1806-20 después de la llamarada gigante.
- Obtención de un espectro de radio de alta resolución de 21 cm para sondear el hidrógeno neutro interestelar.
- Analizar el espectro de radio para obtener una medición directa de la distancia a la fuente.
Principales resultados:
- Detección de una contraparte de radio en desvanecimiento de la llamarada gigante SGR 1806-20.
- Medición de distancia directa a SGR 1806-20, restringido entre 6.4 y 9.8 kpc.
- La energía y la rápida desintegración de la emisión de radio observada son inconsistentes con los modelos estándar de resplandor de la explosión de rayos gamma.
Conclusiones:
- La emisión de radio probablemente se origina en los escombros expulsados durante el evento de la llamarada gigante del magnetar.
- La estimación revisada de la distancia tiene un impacto en el presupuesto energético calculado de la llamarada, lo que podría aliviar las restricciones teóricas.
- Este estudio proporciona nuevos conocimientos sobre la física de las llamaradas gigantes magnetares y sus mecanismos de emisión asociados.
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