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Aceleración de partículas de muy alta energía impulsada por los chorros del microcuásar SS 433
A U Abeysekara1, A Albert2, R Alfaro3
1Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, USA.
Nature
|October 5, 2018
Resumen
Las observaciones de rayos gamma de alta energía revelan que el sistema SS 433/W50
Área de la Ciencia:
- La astrofísica
- Astrofísica de alta energía
- Astrofísica de las partículas
Sus antecedentes:
- SS 433 es un microquásar con una estrella supergigante que se acumula en un objeto compacto, produciendo potentes chorros.
- Estos chorros interactúan con el remanente de la supernova W50, causando distorsiones y aceleración de partículas.
- Estudios anteriores a energías más altas (por encima de 100 GeV) tuvieron resultados ambiguos con respecto al mecanismo de emisión (electrones frente a protones).
Objetivo del estudio:
- Investigar el origen de la emisión de rayos gamma de alta energía del sistema SS 433/W50.
- Resolver espacialmente las regiones de emisión dentro de los lóbulos W50.
- Determinar la población de partículas dominantes y el rango de energía responsable de la radiación observada.
Principales métodos:
- Se utilizaron las observaciones de rayos gamma de teraelectronvolt (TeV) para estudiar el sistema SS 433/W50.
- Técnicas empleadas para resolver espacialmente los lóbulos del remanente W50.
- Analizaron energías de fotones de hasta al menos 25 TeV y consideraron la geometría de visualización del sistema.
Principales resultados:
- Se detectó una emisión de rayos gamma TeV localizada en estructuras dentro de los lóbulos W50, lejos del binario central SS 433.
- Energías de fotones medidas que alcanzan al menos 25 TeV, lo que confirma la emisión no impulsada por Doppler.
- La emisión observada a través de un amplio rango de energía (radio a TeV) es consistente con una sola población de electrones.
Conclusiones:
- La emisión de SS 433/W50 proviene de electrones acelerados a por lo menos cientos de TeV.
- Estos electrones energéticos existen dentro de un campo magnético de aproximadamente 16 microgauss en los lóbulos W50.
- Los hallazgos aclaran el mecanismo de emisión en este sistema de microcuásares, atribuyéndolo a los electrones en lugar de los protones.
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