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Una llamarada gigante de rayos gamma desde el magnetar SGR 1806-20-20
D M Palmer1, S Barthelmy, N Gehrels
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. palmer@lanl.gov
Nature
|April 29, 2005
Resumen
Los repetidores blandos de rayos gamma (SGR) son magnetares, que emiten poderosas explosiones de rayos X. Una llamarada gigante de SGR 1806-20 liberó 2 x 10 ^ 46 erg, probablemente debido a la reconfiguración del campo magnético.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Astrofísica de altas energías de alta energía.
- Física de las estrellas de neutrones Física de las estrellas de neutrones
Sus antecedentes:
- Los magnetares son estrellas de neutrones con campos magnéticos ultra fuertes (aprox. 10^15 G). es decir, 10^15 G). es decir, 10^15 G).
- Los repetidores blandos de rayos gamma (SGR) y los púlsares de rayos X anómalos son clases de magnetares.
- Los SGR exhiben ráfagas ocasionales y llamaradas gigantes extremadamente raras.
Objetivo del estudio:
- Para informar y analizar un evento de llamarada gigante del magnetar SGR 1806-20.
- Para caracterizar la salida de energía y la causa potencial de la llamarada observada.
Principales métodos:
- Observación y análisis de los datos de emisión de rayos X de SGR 1806-20.
- Cálculo de energía del evento de la llamarada gigante.
Principales resultados:
- Una llamarada gigante se observó desde SGR 1806-20 el 27 de diciembre de 2004.
- La energía isotrópica de la llamarada alcanzó 2 x 1046 erg, superando significativamente las llamaradas gigantes anteriores.
- La liberación de energía se atribuye a una reconfiguración catastrófica del campo magnético.
Conclusiones:
- La llamarada gigante observada proporciona información sobre los mecanismos de liberación de energía magnetar.
- Tales eventos, si se observan desde distancias extragalácticas, podrían clasificarse como ráfagas de rayos gamma cortas y duras.
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