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GRB 090423 en un corrimiento al rojo de z de aproximadamente 8,1
R Salvaterra1, M Della Valle, S Campana
1INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy. salvaterra@mib.infn.it
Nature
|October 30, 2009
Resumen
Los astrónomos detectaron un estallido de rayos gamma (GRB) con un desplazamiento al rojo récord de z = 8.1.1. Este GRB del universo temprano sugiere que mecanismos similares de explosión estelar existieron poco después del Big Bang.
Área de la Ciencia:
- Cosmología Cosmología.
- La astrofísica es la astrofísica.
- Astrofísica de altas energías de alta energía.
Sus antecedentes:
- Las explosiones de rayos gamma (GRB) se originan en explosiones estelares masivas.
- Los resplandores posteriores de GRB son detectables a distancias cosmológicas debido a su brillo óptico.
- El desplazamiento al rojo más alto anterior para un GRB fue z = 6.7.
Objetivo del estudio:
- Para reportar la observación del GRB 090423.3.
- Para medir el corrimiento al rojo de GRB 090423 utilizando espectroscopia de infrarrojo cercano.
- Para investigar los fenómenos del universo temprano a través de observaciones de GRB.
Principales métodos:
- Observaciones del GRB 090423.3 han sido realizadas.
- Medición espectroscópica del desplazamiento al rojo en el infrarrojo cercano.
Principales resultados:
- El corrimiento al rojo del GRB 090423 medido en z = 8.1 (+0.1/-0.3).
- Este GRB ocurrió aproximadamente 600 millones de años después del Big Bang.
- Las propiedades de los GRB son comparables a las de los desplazamientos al rojo más bajos.
Conclusiones:
- Los hallazgos empujan la frontera de las GRB observables hacia desplazamientos al rojo más altos.
- Los GRB del universo temprano comparten propiedades similares con los posteriores, lo que indica mecanismos progenitoras consistentes.
- Esto sugiere que los procesos que forman los GRB se establecieron muy temprano en la historia cósmica.
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