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Inspiradoras corrientes de gas enriquecido observadas alrededor de una galaxia masiva hace 11 mil millones de años
Shiwu Zhang1, Zheng Cai1,2, Dandan Xu1
1Department of Astronomy, Tsinghua University, Beijing 100084, China.
Science (New York, N.Y.)
|May 4, 2023
Resumen
El reciclaje de gas alimenta la formación temprana de estrellas. Los científicos observaron corrientes de gas alrededor de una galaxia masiva, encontrando evidencia de material enriquecido anteriormente expulsado, apoyando modelos de montaje de galaxias.
Área de la Ciencia:
- La evolución cósmica
- Formación y evolución de las galaxias
- La astrofísica
Sus antecedentes:
- La formación estelar es fundamental para la evolución de las galaxias.
- Las simulaciones sugieren que el reciclaje de gas es crucial para mantener la formación de estrellas, especialmente en el Universo temprano.
- Comprender la acreción y eyección de gas es clave para el ensamblaje de galaxias.
Objetivo del estudio:
- Para investigar el reciclaje de gas alrededor de galaxias masivas con alto corrimiento al rojo.
- Proporcionar pruebas observacionales de la recreación de gas expulsado previamente.
- Para entender los mecanismos que sostienen la formación de estrellas en el Universo temprano.
Principales métodos:
- Observación de una galaxia masiva con desplazamiento al rojo 2.3.
- Detección de líneas de emisión de hidrógeno neutro, helio y carbono ionizado en el medio circumgaláctico.
- Análisis de la cinemática y la abundancia química del gas circumgaláctico.
Principales resultados:
- Las líneas de emisión detectadas hasta 100 kiloparsecs de la galaxia.
- La cinemática de los gases circumgalácticos es consistente con una corriente inspiradora.
- La abundancia de carbono indica el enriquecimiento de material expulsado previamente.
Conclusiones:
- El flujo de gas observado se interpreta como evidencia de reciclaje de gas.
- Este proceso de reciclaje probablemente contribuye a la formación sostenida de estrellas durante el ensamblaje de galaxias de alto desplazamiento al rojo.
- Los hallazgos apoyan los modelos teóricos de la evolución de las galaxias que involucran el ciclo de los gases.
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