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Ejecta relativista de un flash de rayos X XRF 060218 y la tasa de explosiones cósmicas
A M Soderberg1, S R Kulkarni, E Nakar
1Caltech Optical Observatories 105-24, California Institute of Technology, Pasadena, California 91125, USA. ams@astro.caltech.edu
Nature
|September 1, 2006
Resumen
Los destellos de rayos X (XRF) y las explosiones de rayos gamma (GRB) son supernovas raras de estrellas masivas. Las observaciones de XRF 060218 sugieren que la producción de eyecciones relativistas las distingue de las supernovas típicas.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Explosiones cósmicas, explosiones cósmicas.
- Evolución estelar de la evolución estelar.
Sus antecedentes:
- Las explosiones de rayos gamma de larga duración (GRB) y los destellos de rayos X (XRF) son eventos raros y altamente luminosos vinculados a las muertes de estrellas masivas.
- Si bien los GRB / XRF y las supernovas comparten orígenes, los mecanismos físicos que diferencian sus luminosidades extremas siguen sin estar claros.
Objetivo del estudio:
- Para investigar la naturaleza de los destellos de rayos X (XRF) mediante el análisis de XRF 060218 (SN 2006aj).
- Comprender las principales diferencias físicas entre los GRB/XRF y las supernovas ordinarias.
Principales métodos:
- Se realizaron observaciones de radio y rayos X de XRF 060218.8.
- Analizó la salida de energía y las propiedades de eyección del evento.
Principales resultados:
- XRF 060218 es menos energético y más común que los GRB cósmicos típicos.
- Este evento exhibe eyecciones ligeramente relativistas y un motor central emisor de rayos X persistente.
- La energía liberada es de aproximadamente 10^48 erg.
Conclusiones:
- La producción de eyecciones relativistas es la principal distinción entre los GRB/XRF y las supernovas ordinarias.
- La naturaleza del motor central (agujero negro o magnetar) puede diferenciar los GRB típicos de los eventos esféricos menos luminosos como XRF 060218.8.
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