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Updated: Apr 30, 2026
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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Un breve estallido de rayos gamma aparentemente asociado con una galaxia elíptica con desplazamiento al rojo z =
N Gehrels1, C L Sarazin, P T O'Brien
1NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
Nature
|October 7, 2005
Resumen
Los investigadores localizaron una explosión corta de rayos gamma (GRB), GRB 050509B, cerca de una galaxia elíptica. Este hallazgo apoya la teoría de que los GRB cortos se originan de la fusión de binarios de estrellas de neutrones o agujeros negros.
Área de la Ciencia:
- * Astrofísica es la astrofísica.
- * Astrofísica de alta energía.
- * Cosmología observacional.
Sus antecedentes:
- * Las explosiones de rayos gamma (GRB) se clasifican como eventos largos (> 2s) o cortos y duros.
- * Los GRB largos, a menudo con un alto corrimiento al rojo (z ~ 1), se originan en el colapso del núcleo de una estrella masiva.
- * Los GRB cortos carecían de una localización precisa y rápida, lo que dificultaba los estudios de origen.
Objetivo del estudio:
- * Para detectar y localizar el estallido corto de rayos gamma GRB 050509B.
- * Investigar el origen de los GRB cortos mediante la localización exacta de su ubicación.
- * Para explicar la dificultad histórica en la localización de GRBs cortos.
Principales métodos:
- * Se ha detectado un resplandor de rayos X del GRB corto 050509B.
- * Localizado GRB 050509B a una posición precisa en el cielo (<10").
- * Se buscó el resplandor óptico, estableciendo límites superiores estrictos.
Principales resultados:
- * GRB 050509B se localizó cerca de una galaxia elíptica luminosa y no formadora de estrellas con desplazamiento al rojo z = 0.225.
- * El resplandor de los rayos X fue débil y se desvaneció rápidamente en cuestión de horas.
- * No se detectó ningún resplandor óptico, en consonancia con los desafíos de localización anteriores.
Conclusiones:
- * La localización del GRB 050509B apoya los orígenes de fusiones binarias (estrella de neutrones o agujero negro).
- * El débil y efímero resplandor posterior explica la dificultad en la rápida localización de GRBs cortos.
- * Este estudio proporciona evidencia observacional crucial para los progenitores de GRB cortos.
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