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Una galaxia masiva de explosión estelar máxima oscurecida por el polvo con un corrimiento al rojo de 6.34
Dominik A Riechers1, C M Bradford, D L Clements
1California Institute of Technology, 1200 East California Boulevard, MC 249-17, Pasadena, California 91125, USA. dr@astro.cornell.edu
Nature
|April 20, 2013
Resumen
Los astrónomos descubrieron una galaxia masiva de estallido estelar con desplazamiento al rojo de 6.34, lo que indica que la intensa formación estelar ocurrió mucho antes en el universo. Este hallazgo revela que los entornos galácticos maduros existieron 880 millones de años después del Big Bang.
Área de la Ciencia:
- La evolución cósmica es la evolución cósmica.
- Formación de galaxias Formación de galaxias
- El universo temprano astrofísica astrofísica.
Sus antecedentes:
- Las galaxias masivas probablemente formaron estrellas rápidamente en las primeras épocas cósmicas.
- Se desconoce la existencia de progenitores masivos de explosiones estelares poco después del Big Bang.
- Observaciones anteriores sugirieron desplazamientos al rojo más bajos para estallidos de estrellas polvorientas debido a sesgos de selección.
Objetivo del estudio:
- Para identificar galaxias masivas de estallido estelar con muy altos desplazamientos al rojo.
- Para investigar la existencia de entornos galácticos maduros en el universo temprano.
Principales métodos:
- Utilizó una técnica de selección de color submilimétrica para identificar galaxias candidatas.
- Determinación del corrimiento al rojo utilizando líneas de refrigeración de estructuras finas moleculares y atómicas.
- Analizó las propiedades del medio interestelar y la tasa de formación estelar.
Principales resultados:
- Identificó una galaxia masiva de estallido estelar en el corrimiento al rojo z = 6.34.
- Reveló una galaxia con 100 mil millones de masas solares de medio interestelar excitado y químicamente evolucionado.
- Se midió una tasa de formación estelar más de 2.000 veces mayor que la de la Vía Láctea.
Conclusiones:
- Las galaxias masivas de estallido de estrellas existían ya 880 millones de años después del Big Bang.
- Los entornos capaces de formar explosiones estelares intensas y masivas estaban presentes en el universo temprano.
- Desafía la noción de una disminución universal en la formación de estrellas a altos desplazamientos al rojo.
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