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Enriquecimiento de elementos pesados en regiones de baja densidad del medio intergaláctico

L L Cowie¹, A Songaila

¹Institute for Astronomy, University of Hawaii, Honolulu 96822, USA. cowie@uhifa.ifa.hawaii.edu

|July 17, 1998

Resumen

Las primeras galaxias inesperadamente enriquecieron el gas intergaláctico de baja densidad con elementos pesados. Este hallazgo desafía los modelos de evolución química cósmica y sugiere que las pequeñas galaxias han expulsado eficientemente elementos al medio intergaláctico.

Área de la Ciencia:

Cosmología Cosmología.
La astrofísica es la astrofísica.
El medio intergaláctico es el medio intergaláctico.

Sus antecedentes:

Los modelos cosmológicos predicen que el gas intergaláctico de baja densidad con alto corrimiento al rojo es pobre en elementos.
Se cree que la síntesis y distribución de elementos pesados ocurren preferentemente en regiones densas.

Objetivo del estudio:

Para sondear la abundancia de elementos pesados en el gas intergaláctico de baja densidad con desplazamiento al rojo tres.
Para analizar las líneas de absorción de carbono y oxígeno en espectros de cuásares.

Principales métodos:

Desarrolló un nuevo método para analizar las líneas de absorción en espectros de cuásares.
Centrado en las líneas de absorción de carbono y oxígeno para determinar la abundancia de elementos pesados.
Gas examinado a través de un rango de densidades, incluyendo regiones de densidad cercana a cero.

Principales resultados:

La relación entre el carbono triplemente ionizado y el hidrógeno neutro se mantuvo relativamente constante en todas las densidades.
Incluso en regiones de densidad cercana a cero, las abundancias de elementos pesados fueron inesperadamente altas.
Esto indica un enriquecimiento significativo de gas intergaláctico de baja densidad.

Conclusiones:

Las primeras galaxias pequeñas pueden ser altamente eficientes en la eyección de elementos pesados en el medio intergaláctico.
Los modelos actuales de la composición del medio intergaláctico pueden necesitar revisión.
Sugiere una comprensión revisada de los primeros procesos cósmicos de enriquecimiento químico.

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