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Cúmulos de estrellas observados en una galaxia con lente 460 Myr después del Big Bang
Angela Adamo1, Larry D Bradley2, Eros Vanzella3
1Astronomy Department, Stockholm University and Oskar Klein Centre, Stockholm, Sweden. angela.adamo@astro.su.se.
Nature
|June 24, 2024
Resumen
La galaxia de las Gemas Cósmicas revela pequeños y densos cúmulos de estrellas, ofreciendo nuevos conocimientos sobre la evolución temprana de las galaxias y la reionización del universo. Estos cúmulos proto-globulares se formaron rápidamente en el universo temprano.
Área de la Ciencia:
- Astronomía y astrofísica
- La evolución cósmica
- Formación de las galaxias
Sus antecedentes:
- El arco de las Gemas Cósmicas es una galaxia muy ampliada y brillante con desplazamiento al rojo z≈10.2.
- Es una galaxia intrínsecamente débil ultravioleta, potencialmente crucial para la reionización del Universo.
- Las observaciones anteriores resolvieron características de cientos a decenas de parsecs en galaxias similares.
Objetivo del estudio:
- Para investigar la fina estructura de la galaxia de las Gemas Cósmicas utilizando las observaciones del JWST.
- Para caracterizar las propiedades de los cúmulos estelares resueltos dentro de esta galaxia temprana.
- Para entender el papel de la formación de estrellas y la retroalimentación en la formación de galaxias durante la reionización.
Principales métodos:
- Utilizó el Telescopio Espacial James Webb (JWST) para observaciones de alta resolución de las Gemas Cósmicas.
- Analizó la distribución de la luz para resolver los cúmulos de estrellas individuales.
- Modelos de lente aplicados para corregir los efectos de aumento y determinar las propiedades intrínsecas.
Principales resultados:
- Se resolvieron cinco cúmulos de estrellas dentro de una región compacta (<70 pc) de la galaxia.
- Los cúmulos muestran polvo mínimo, baja metalicidad, edades jóvenes (<50 Myr) y masas de ~ 10^6 M.
- Los tamaños corregidos por la lente son de ~ 1 pc con densidades de superficie estelar extremadamente altas (~ 10 ^ 5 M pc-2), consistentes con los cúmulos proto-globulares.
Conclusiones:
- La formación de cúmulos estelares en el Universo primitivo fue muy eficiente, formando densos cúmulos proto-globulares.
- Estos hallazgos sugieren que la formación de cúmulos estelares y la retroalimentación jugaron un papel importante en la formación de galaxias durante la época de reionización.
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