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Un desplazamiento al rojo fotométrico de z = 6,39 +/- 0,12 para el GRB 050904

J B Haislip¹, M C Nysewander, D E Reichart

¹Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Campus Box 3255, Chapel Hill, North Carolina 27599, USA.

|March 10, 2006

Resumen

Descubrimos el resplandor de un estallido de rayos gamma (GRB) con desplazamiento al rojo z = 6.3, un récord para estos eventos cósmicos. Este hallazgo muestra que los GRB son herramientas poderosas para estudiar el Universo temprano.

Área de la Ciencia:

Explosiones cósmicas y eventos astronómicos transitorios.
Cosmología y astrofísica del Universo Temprano.

Sus antecedentes:

Las explosiones de rayos gamma (GRB) son fenómenos transitorios excepcionalmente luminosos.
Se predice que los GRB y sus resplandores posteriores serán observables hasta el corrimiento al rojo z ≈ 20.
Estos eventos ofrecen potencial como sondas del Universo temprano.

Objetivo del estudio:

Para informar sobre el descubrimiento del resplandor del infrarrojo cercano del GRB 050904.4.
Para determinar el desplazamiento al rojo de GRB 050904 utilizando observaciones de resplandor posterior.
Para evaluar la utilidad de los GRB como sondas del Universo temprano.

Principales métodos:

Observación del resplandor del infrarrojo cercano del GRB 050904.4.
Intento de detección del resplandor óptico.
Estimación fotométrica del corrimiento al rojo basada en datos de resplandor posterior.
Confirmación del desplazamiento al rojo espectroscópico.

Principales resultados:

Descubrimiento de un brillante resplandor en el infrarrojo cercano para GRB 050904.4.
El desplazamiento hacia el rojo fotométrico se determinó como z = 6.39 - 0.12 + 0.11.
El desplazamiento al rojo espectroscópico confirmado en z = 6.29 ± 0.01, consistente con la estimación fotométrica.
GRB 050904 identificado como el resplandor más lejano de GRB descubierto hasta la fecha.

Conclusiones:

Los GRB se confirman como herramientas valiosas para investigar el Universo temprano.
El resplandor posterior del GRB observado permite rastrear la historia de la formación estelar.
La metalicidad y las historias de reionización del Universo primitivo se pueden estudiar utilizando GRB.

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