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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
El inusual estallido de rayos gamma GRB 101225A de una fusión de estrella de helio / estrella de neutrones con
C C Thöne1, A de Ugarte Postigo, C L Fryer
1IAA - CSIC, Glorieta de la Astronomía s/n, 18008 Granada, Spain. cthoene@iaa.es
Nature
|December 2, 2011
Resumen
La inusual explosión larga de rayos gamma (GRB) 101225A exhibió una emisión de larga duración seguida de una supernova térmica de rayos X transitorios y óptica. Se propone una fusión de estrellas de helio y estrellas de neutrones como el evento progenitor.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Astrofísica de altas energías de alta energía.
- Evolución estelar de la evolución estelar.
Sus antecedentes:
- Las explosiones largas de rayos gamma (GRB) están asociadas con muertes estelares masivas y supernovas.
- Los GRB involucran chorros ultra-relativistas que producen emisión no térmica a través de la radiación de sincrotrón.
- La comprensión de los progenitores de GRB y los mecanismos de emisión es crucial para la astrofísica.
Objetivo del estudio:
- Para analizar las características únicas del largo estallido de rayos gamma GRB 101225A.
- Para investigar los mecanismos de emisión y el progenitor de este inusual evento GRB.
- Para determinar el desplazamiento al rojo y las propiedades de la galaxia anfitriona de GRB 101225A.
Principales métodos:
- Observación y análisis de las emisiones de rayos gamma, rayos X y ópticas del GRB 101225A.
- Ajuste de la distribución de energía espectral y la curva de luz con una plantilla GRB-supernova para estimar el corrimiento al rojo.
- Modelación de la emisión como un cuerpo negro en expansión, enfriamiento y una supernova posterior.
Principales resultados:
- GRB 101225A mostró una emisión de rayos gamma de vida excepcionalmente larga.
- Se observó un brillante transitorio de rayos X con un componente térmico caliente y una contraparte óptica inusual.
- La emisión óptica evolucionó como un cuerpo negro en enfriamiento, seguido por un débil componente de supernova, con un desplazamiento al rojo estimado de z = 0.33.
Conclusiones:
- Un progenitor propuesto es una fusión de una estrella de helio con una estrella de neutrones, lo que lleva a un chorro similar a un GRB termalizado por el material eyectado.
- Una explicación alternativa implica que un cuerpo menor se acrecentó en una estrella de neutrones galáctica.
- Los fenómenos observados desafían los modelos convencionales de GRB, sugiriendo diversos escenarios de progenitor.
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