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Un chorro de radio transitorio en una enana nova en erupción
Elmar Körding1, Michael Rupen, Christian Knigge
1School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK. elmar@phys.soton.ac.uk
Science (New York, N.Y.)
|June 7, 2008
Resumen
Los astrónomos detectaron el primer chorro astrofísico de una nova enana, un tipo de enana blanca en acreción. Este descubrimiento sugiere que el mecanismo de acoplamiento disco / chorro es común en todos los objetos celestes en acrecentamiento.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
- Física del plasma es la física del plasma.
Sus antecedentes:
- Los chorros astrofísicos se observan en varios objetos de acreción, incluidos los agujeros negros supermasivos y los objetos estelares jóvenes.
- Un escenario unificado de acoplamiento de disco / chorro, basado principalmente en binarios de rayos X, ha sido ampliamente aceptado.
- Las variables cataclísmicas, específicamente las novas enanas (enanas blancas de débil acreción), se consideraron excepciones debido a la falta de chorros detectados a pesar de comportamientos de estallido similares a los binarios de rayos X.
Objetivo del estudio:
- Para investigar la presencia de chorros astrofísicos en las nuevas enanas.
- Para determinar si el mecanismo de acoplamiento disco / chorro observado en otros objetos en acrecentamiento también está presente en las novas enanas.
- Para probar la hipótesis de que la producción de chorros es un fenómeno ubicuo en los sistemas de acreción.
Principales métodos:
- Se realizaron observaciones por radio de una nova enana durante su fase de estallido.
- Analizó la emisión de radio observada en busca de características indicativas de la emisión de sincrotrón de un chorro.
- Comparó las propiedades del chorro inferido (potencia, relación con el ciclo de explosión) con las observadas en binarios de rayos X.
Principales resultados:
- Se detectó una emisión de radio de espectro plano variable de la nova enana durante el estallido.
- Interpretó la emisión de radio como procedente de un chorro transitorio, consistente con la emisión de sincrotrón.
- Descubrió que la potencia de chorro inferida y su relación con el ciclo de explosión son análogas a las de las binarias de rayos X.
Conclusiones:
- La detección de un chorro en una nova enana desafía la noción de que estos sistemas son excepciones a la producción de chorros.
- Los hallazgos sugieren que el mecanismo de acoplamiento disco / chorro es realmente ubicuo, operando a través de una amplia gama de objetos de acrecentamiento.
- Este estudio unifica la comprensión de la formación de chorros en diversos entornos astrofísicos, desde objetos de masa estelar hasta agujeros negros supermasivos.
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