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11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Un hiper-estrellamiento a escala de kiloparsec en un cuásar acoge menos de 1 giga año después del Big Bang
Fabian Walter1, Dominik Riechers, Pierre Cox
1Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany. walter@mpia.de
Nature
|February 6, 2009
Resumen
Las primeras galaxias forman estrellas en grandes regiones, a diferencia de las galaxias locales. Este estudio revela la formación de estrellas en una galaxia anfitriona de cuásares z = 6.42 que abarca 750 pc, lo que sugiere un rápido crecimiento de estructuras esferoidales masivas.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Evolución cósmica de la evolución cósmica.
- Formación de galaxias Formación de galaxias
Sus antecedentes:
- Los cuásares son núcleos galácticos activos extremadamente luminosos alimentados por agujeros negros supermasivos.
- Las galaxias del Universo temprano exhiben altas tasas de formación estelar, pero las escalas de esta actividad son poco conocidas.
- Las galaxias luminosas locales muestran explosiones estelares compactas (<100 pc), en contraste con los primeros modelos de formación de galaxias.
Objetivo del estudio:
- Para investigar la distribución espacial de la formación de estrellas en la galaxia anfitriona de un cuásar de alto desplazamiento al rojo (SDSS J114816.64+525150.3).3).
- Para comparar las escalas de formación estelar en el Universo temprano con las observadas en galaxias locales.
- Comprender las implicaciones para la formación de estructuras galácticas masivas.
Principales métodos:
- Imágenes con resolución espacial de la emisión [C ii] de la galaxia anfitriona.
- Análisis de la luminosidad infrarroja para estimar la actividad de formación estelar.
- Comparación de las escalas observadas con los puntos de referencia de galaxias locales (por ejemplo, Arp 220).
Principales resultados:
- El gas formador de estrellas en la galaxia anfitriona del cuásar se distribuye en un radio de aproximadamente 750 pc.
- La densidad superficial de la tasa de formación estelar es de ~ 1,000 años ((-1) kpc ((-2), comparable a los valores máximos en estallidos estelares locales.
- La región de formación estelar es significativamente más grande (dos órdenes de magnitud) que en las galaxias luminosas locales.
Conclusiones:
- La formación de estrellas en el Universo temprano ocurre en escalas mucho más grandes que en el Universo local.
- Esta generalizada y vigorosa formación estelar es probablemente un proceso clave en la construcción de componentes esferoidales masivos en las primeras galaxias.
- Los hallazgos desafían las suposiciones anteriores sobre estallidos estelares compactos en galaxias primordiales.
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