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Formación estelar intensa dentro de regiones compactas resueltas en una galaxia en z = 2,3
A M Swinbank1, I Smail, S Longmore
1Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK. a.m.swinbank@dur.ac.uk
Nature
|March 23, 2010
Resumen
Las galaxias tempranas masivas exhiben una intensa formación estelar, impulsada por fusiones. La lente gravitacional permitió una resolución sin precedentes de las regiones de formación estelar, revelando una física similar pero con una energía mucho más alta que las galaxias locales.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Cosmología Cosmología.
Sus antecedentes:
- Las galaxias masivas en el Universo temprano forman estrellas a tasas excepcionalmente altas.
- Las galaxias oscurecidas por el polvo son ejemplos clave, potencialmente formando estrellas a 1.000 masas solares por año.
- Es probable que estas explosiones sean provocadas por fusiones de galaxias ricas en gas.
Objetivo del estudio:
- Para sondear las propiedades de las regiones individuales de formación estelar en las primeras galaxias masivas.
- Para superar las limitaciones en la resolución espacial y la sensibilidad de los telescopios actuales.
- Para investigar la física y la energética de la formación de estrellas en el Universo temprano.
Principales métodos:
- Observaciones de la galaxia submilimétrica con lente gravitacional SMMJ2135-0102 (desplazamiento al rojo z = 2.3259).
- Utilizó un factor de ampliación de 32 proporcionado por una lente de cúmulo de galaxias en primer plano.
- Empleó imágenes submilimétricas de alta resolución para lograr una resolución de escala lineal de 100 parsecs.
Principales resultados:
- Regiones de formación estelar resueltas dentro de SMMJ2135-0102.
- Encontraron densidades de luminosidad comparables a las de núcleos de nubes moleculares gigantes locales.
- Las regiones observadas fueron ~100 veces más grandes y 10^7 veces más luminosas que las contrapartes locales.
Conclusiones:
- La física subyacente de la formación estelar en z ~ 2 parece similar a las galaxias locales.
- Las energías de estas primeras regiones de formación estelar son significativamente más altas que las observadas hoy en día.
- La lente gravitacional es una herramienta poderosa para estudiar la evolución de las galaxias de alto desplazamiento al rojo.
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