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Descubrimiento de poderosas llamaradas de rayos gamma de la Nebulosa del Cangrejo
M Tavani1, A Bulgarelli, V Vittorini
1Istituto Nazionale di Astrofisica-Istituto di Astrofisica Spaziale e Fisica Cosmica (INAF-IASF) Roma, via del Fosso del Cavaliere 100, 00133 Roma, Italy. pi.agile@iasf-roma.inaf.it
Science (New York, N.Y.)
|January 8, 2011
Resumen
La Nebulosa del Cangrejo, un remanente de supernova, exhibió inesperadas llamaradas de rayos gamma detectadas por el satélite AGILE. Estos poderosos eventos de corta duración desafían los modelos existentes de emisión nebulosa.
Área de la Ciencia:
- Astrofísica de altas energías de alta energía.
- Los remanentes de las supernovas.
- La física del púlsar es la física del púlsar.
Sus antecedentes:
- Se pensaba que la Nebulosa del Cangrejo, impulsada por un púlsar, tenía emisiones estables.
- Las observaciones anteriores no indicaron una variabilidad significativa en la salida de rayos gamma.
Objetivo del estudio:
- Informar y analizar la detección de fuertes llamaradas de rayos gamma de la Nebulosa del Cangrejo.
- Investigar el origen y las implicaciones de estos eventos transitorios.
Principales métodos:
- Detección de llamaradas de rayos gamma (100 MeV10 GeV) utilizando el satélite AGILE.
- Análisis del flujo de las llamaradas y escala de tiempo.
- Discusión de datos ópticos y de rayos X complementarios de Chandra y el Hubble.
Principales resultados:
- Fuertes llamaradas de rayos gamma se observaron en septiembre de 2010 y octubre de 2007.
- El flujo de rayos gamma se triplicó durante las llamaradas en comparación con los períodos de quietud.
- Las características de las llamaradas sugieren un origen cercano al púlsar.
Conclusiones:
- Las llamaradas observadas desafían los modelos estándar de emisión nebulosa de la Nebulosa del Cangrejo.
- Los hallazgos requieren nuevos modelos que impliquen una rápida aceleración de partículas, posiblemente a través de turbulencias de ondas de plasma impulsadas por golpes.
- Se propone una escala de tiempo de aproximadamente 1 día para la aceleración.
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