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Un ambiente magneto-iónico extremo asociado con la fuente de ráfagas de radio rápidas FRB 121102
D Michilli1,2, A Seymour3, J W T Hessels1,2
1ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
Nature
|January 12, 2018
Resumen
Las ráfagas rápidas de radio son señales cósmicas misteriosas. FRB 121102 exhibe una polarización extrema y un entorno dinámico, lo que sugiere una estrella de neutrones cerca de un agujero negro masivo.
Área de la Ciencia:
- La astrofísica
- La radioastronomía
- Fenómenos cósmicos
Sus antecedentes:
- Las ráfagas de radio rápidas (FRB) son destellos de radio extragalácticos de milisegundos con orígenes desconocidos.
- FRB 121102 es el único FRB repetitivo conocido, localizado en la región de formación estelar de una galaxia enana cerca de una fuente de radio persistente.
- El origen de los FRB, la naturaleza de la fuente persistente y el entorno local siguen sin estar claros.
Objetivo del estudio:
- Para investigar las propiedades de FRB 121102.
- Para entender el entorno extremo que rodea a la fuente de FRB repetida.
- Limitar el origen físico de los FRB y la naturaleza de su fuente persistente.
Principales métodos:
- Observaciones de FRB 121102 utilizando radiotelescopios.
- Análisis de las propiedades de polarización, incluida la medida de rotación de Faraday.
- Medición de la estructura temporal y la variabilidad en el tiempo.
Principales resultados:
- FRB 121102 muestra casi un 100% de polarización lineal.
- Se observó una medida de rotación de Faraday muy alta y variable (1.331.46 × 10^5 rad/m2).
- Se detectó una estructura temporal estrecha (< 30 microsegundos).
Conclusiones:
- El ambiente magneto-iónico extremo y dinámico sugiere que FRB 121102 está cerca de un agujero negro masivo.
- Las breves duraciones de las explosiones y las altas mediciones de rotación apuntan hacia un origen de estrella de neutrones.
- Los posibles escenarios incluyen una estrella de neutrones en un entorno de agujero negro masivo o una nebulosa magnetizada.
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