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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Descubrimiento de la explosión corta de rayos gamma GRB 050709
J S Villasenor1, D Q Lamb, G R Ricker
1MIT Kavli Institute, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, Massachusetts 02139, USA. jsvilla@space.mit.edu
Nature
|October 7, 2005
Resumen
Los investigadores descubrieron el resplandor de rayos X y el resplandor óptico de una ráfaga de rayos gamma corta y dura (GRB, por sus siglas en inglés), revelando su origen cosmológico. Este hallazgo sugiere que la fusión de sistemas binarios compactos puede causar estas misteriosas explosiones cósmicas.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Explosiones cósmicas, explosiones cósmicas.
- Astrofísica de altas energías de alta energía.
Sus antecedentes:
- Las explosiones de rayos gamma (GRB) se clasifican como cortas, duras o largas y suaves.
- Se entiende que los GRB largos y blandos se originan en explosiones estelares masivas a distancias cosmológicas, exhibiendo rayos X y resplandores ópticos.
- Los GRB de corta dureza siguen siendo enigmáticos con respecto a su distancia, energía y progenitores.
Objetivo del estudio:
- Para investigar la naturaleza y el origen de las ráfagas de rayos gamma cortas y duras.
- Para determinar si los GRB de corta duración ocurren a distancias cosmológicas e identificar sus progenitores.
Principales métodos:
- Localización precisa de un estallido de rayos gamma corto y duro.
- Observaciones de seguimiento para detectar rayos X y resplandor óptico.
- Identificación de la galaxia anfitriona y determinación del corrimiento al rojo.
Principales resultados:
- Descubrimiento de los resplandores ópticos y de rayos X de un GRB de corta duración.
- Identificación de la galaxia anfitriona como una galaxia de tipo tardío con desplazamiento al rojo z = 0.16.
- Confirmación de que al menos algunos GRBs de corta duración ocurren a distancias cosmológicas.
Conclusiones:
- Las ráfagas de rayos gamma cortas y duras pueden ocurrir a distancias cosmológicas, contrariamente a las suposiciones anteriores.
- Los resplandores observados y la galaxia anfitriona sugieren que la fusión de binarios compactos es un probable progenitor de estos eventos.
- Este estudio resuelve los misterios clave que rodean a los GRBs de corta duración, vinculándolos a las fusiones binarias.
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