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Un desplazamiento al rojo promedio de 2,4 para las galaxias brillantes en longitudes de onda submilimétricas
S C Chapman1, A W Blain, R J Ivison
1California Institute of Technology, Pasadena, California 91125, USA.
Nature
|April 18, 2003
Resumen
Las galaxias del universo temprano, ocultas por el polvo, se revelan a través de observaciones submilimétricas (submm). Los desplazamientos al rojo espectroscópicos muestran que estas galaxias luminosas y polvorientas coexistieron con los cuásares, impactando la evolución cósmica.
Área de la Ciencia:
- Radiación de fondo de microondas cósmicas de fondo de radiación cósmica de microondas
- Evolución de la galaxia Evolución de la galaxia.
- Astronomía de alto desplazamiento al rojo.
Sus antecedentes:
- La producción de energía del Universo temprano estaba dominada por galaxias luminosas y oscurecidas por el polvo.
- Las galaxias submilimétricas (submm) son significativas pero difíciles de estudiar debido a las limitaciones instrumentales.
- Determinar los desplazamientos al rojo (z) de las galaxias submm es fundamental para comprender su naturaleza y evolución cósmica.
Objetivo del estudio:
- Para determinar los desplazamientos al rojo espectroscópicos para diez galaxias submilimétricas identificadas.
- Para investigar la relación entre el crecimiento del agujero negro masivo y las galaxias luminosas y polvorientas.
- Para evaluar la densidad espacial y la importancia cósmica de las galaxias submm a altos desplazamientos al rojo.
Principales métodos:
- Identificación de galaxias submilimétricas utilizando observaciones de radio de alta resolución.
- Determinación espectroscópica del corrimiento al rojo para la muestra de galaxias identificadas.
- Análisis de la densidad espacial de las galaxias y comparación con las galaxias luminosas actuales.
Principales resultados:
- Se obtuvieron desplazamientos al rojo espectroscópicos para diez galaxias submm.
- El desplazamiento al rojo medio de la muestra es de 2,4 (rango de cuartil 1.9-2.8).
- Las galaxias submm en z > 2 son aproximadamente 1.000 veces más densas en el espacio que las galaxias actuales comparables.
Conclusiones:
- Las galaxias submm coexisten con el pico de actividad de cuásares, lo que sugiere un vínculo entre el crecimiento del agujero negro y la evolución de galaxias luminosas y polvorientas.
- Las galaxias submm representan un componente crucial de la formación de estrellas en el Universo temprano.
- Las observaciones de radio de alta resolución son efectivas para estudiar estas galaxias previamente oscurecidas.
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